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HomeMy WebLinkAbout11 2025 PUBLIC HEALTH GOAL REPORTDocusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F MEETING DATE TO: FROM: SUBJECT: SUMMARY: Agenda Item AGENDA REPORT Reviewed: City Manager Finance Director AUGUST 5, 2025 ALDO E. SCHINDLER, CITY MANAGER MICHAEL GRISSO, DIRECTOR OF PUBLIC WORKS 2025 PUBLIC HEALTH GOAL REPORT The California Health and Safety Code requires public water systems serving more than 10,000 service connections to prepare a Public Health Goal report every three years and conduct a public hearing to provide information to consumers on water quality. For the 2022-2024 reporting period, the City's drinking water quality complied with all state and federal drinking water standards. RECOMMENDATION: It is recommended that the City Council: 1. Conduct a public hearing to receive comments and input related to the 2025 Public Health Goal Report; and 2. Approve the 2025 Public Health Goal Report at the conclusion of the public hearing. FISCAL IMPACT: Sufficient funds were appropriated in the Water Enterprise Operating Budget to complete this report. CORRELATION TO THE STRATEGIC PLAN: Approval of the 2025 Public Health Goal Report contributes to the fulfillment of the City's Strategic Plan Goal D: Foster strong community and regional relationships. Specifically, the action implements Strategy 1, which among other things, is to strengthen community engagement with all sectors. BACKGROUND AND DISCUSSION: Provisions of the California Health and Safety Code, Section 116470(b), require public water systems serving more than 10,000 service connections to prepare a brief written Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F City Council Agenda Report 2025 Public Health Goal Report August 5, 2025 Page 2 report identifying detections of any contaminants above the Public Health Goals (PHGs) published by the State Office of Environmental Health Hazard Assessment (OEHHA). The report must also list the detection of any contaminants above the Maximum Contaminant Level Goals (MCLGs) set by the United States Environmental Protection Agency for all other contaminants until such a time that OEHHA has published PHGs for those contaminants. PHGs and MCLGs are "goals" set for contaminants found in drinking water that would pose no significant risk if consumed over a lifetime. While the process of establishing PHGs is a risk -based assessment strictly focused on human health considerations, PHGs and MCLGs are recommended targets and are not enforceable standards. During the reporting periods of 2022, 2023, and 2024, the City's water quality exceeded the PHGs for bromate, gross alpha and beta particle activity, hexavalent chromium, perchlorate, perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), radium combined, and uranium. It is important to note that all water samples that reported above the PHGs, also reported below the state and federal allowable maximum contaminant levels, and the City's water system remains in full compliance with all state and federal water quality standards. The 2025 Public Health Goal Report and Annual Water Quality Reports are available for review on the City's website. Michael Grisso Director of Public Works Attachments: 1. 2025 Public Health Goal Report 2. Annual Water Quality Reports from 2022, 2023, and 2024 Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F ATTACHMENT 1 2025 Public Health Goal Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F Remembering what connects us. CITY OF TUSTIN 2025 PUBLIC HEALTH GOALS REPORT JUNE 2025 861 S.Village Oaks Drive, Suite 100 • Covina CA 91724 Phone: (626) 967-6202 • Fax: (626) 331-7065 • Website:www.stetsonengineers.com Northern California 0 Southern California 0 Arizona 0 Oregon STETSON ENGINEERS INC. Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F 2025 Public Health Goals (PHGs) Report City of Tustin 1.0 Introduction Under the Calderon -Sher Safe Drinking Water Act of 1996 public water systems in California serving greater than 10,000 service connections must prepare a report containing information on 1) detection of any contaminant in drinking water at a level exceeding a Public Health Goal (PHG), 2) estimate of costs to remove detected contaminants to below the PHG using Best Available Technology (BAT), and 3) health risks for each contaminant exceeding a PHG. This report must be made available to the public every three years. The initial PHGs Report was due on July 1, 1998, and subsequent reports are due every three years thereafter. The 2025 PHGs Report has been prepared to address the requirements set forth in Section 116470 of the California Health and Safety Code. It is based on water quality analyses during calendar years 2022, 2023, and 2024 or, if certain analyses were not performed during those years, the most recent data is used. The 2025 PHGs Report has been designed to be as informative as possible, without unnecessary duplication of information contained in the Consumer Confidence Report (also known as Water Quality Report), which is mailed to customers by July 1 of each year. There are no regulations explaining requirements for the preparation of PHGs reports. A workgroup of the Association of California Water Agencies (ACWA) Water Quality Committee has prepared suggested guidelines for water utilities to use in preparing PHGs reports. The ACWA guidelines were used in the preparation of this 2025 PHGs Report. These guidelines include tables of cost estimates for BAT. The State of California (State) provides ACWA with numerical health risks and category of health risk information for contaminants with PHGs. This health risk information is appended to the ACWA guidelines. 2.0 California Drinking Water Regulatory Process California Health and Safety Code Section 116365 requires the State to develop a PHG for every contaminant with a primary drinking water standard or for any contaminant the State is City of Tustin 1 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F proposing to regulate with a primary drinking water standard. A PHG is the level of a contaminant in drinking water that poses no significant health risk if consumed for a lifetime. The process of establishing a PHG is a risk assessment based strictly on human health considerations. PHGs are recommended targets and are not required to be met by any public water system. The State office designated to develop PHGs is the California Environmental Protection Agency's Office of Environmental Health Hazard Assessment (OEHHA). The PHG is then forwarded to the State Water Resources Control Board, Division of Drinking Water (DDW) for use in revising or developing a Maximum Contaminant Level (MCL) in drinking water. The MCL is the highest level of a contaminant that is allowed in drinking water. State MCLs cannot be less stringent than federal MCLs and must be as close as is technically and economically feasible to the PHGs. DDW is required to take treatment technologies and cost of compliance into account when setting an MCL. Each MCL is reviewed at least once every five years. Two radiological contaminants (gross alpha particle activity and gross beta particle activity) have MCLs but do not yet have designated PHGs. For these contaminants, the Maximum Contaminant Level Goal (MCLG), the federal U.S. Environmental Protection Agency (USEPA) equivalent of PHGs, is used in the 2025 PHGs Report. 3.0 Identification of Contaminants Section 116470(b)(1) of the Health and Safety Code requires public water systems serving more than 10,000 service connections to identify each contaminant detected in drinking water that exceeded the applicable PHG. Section 116470(f) requires the MCLG to be used for comparison if there is no applicable PHG. The City of Tustin (City) water system has approximately 14,150 service connections. The following constituents were detected at one or more locations within the drinking water system at levels that exceeded the applicable PHGs or MCLGs: • Bromate — formed when naturally -occurring bromide reacts with ozone during the disinfection process in treated surface water purchased from the Metropolitan Water District of Southern California (MWDSC). City of Tustin 2 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F • Gross alpha particle activity (gross alpha) — naturally -occurring in local groundwater, treated surface water purchased from MWDSC, and treated groundwater purchased from East Orange County Water District (EOCWD). • Gross beta particle activity (gross beta) — naturally -occurring in treated surface water purchased from MWDSC; not required to be tested in groundwater. • Hexavalent Chromium — naturally -occurring in local groundwater and treated groundwater purchased from EOCWD. • Perchlorate — industrial contamination in local groundwater. • Perfluorooctanesulfonic acid (PFOS) — industrial contamination in local groundwater. • Perfluorooctanoic acid (PFOA) — industrial contamination in local groundwater. • Radium, Combined, is the sum of Radium-226 and Radium-228 — naturally -occurring in treated groundwater purchased from EOCWD. • Uranium — naturally -occurring in local groundwater, treated surface water purchased from MWDSC, and treated groundwater purchased from EOCWD. The accompanying table shows the applicable PHG or MCLG and MCL for each contaminant identified above. The table includes the maximum, minimum, and average concentrations of each contaminant in drinking water supplied by the City in calendar years 2022 through 2024. 4.0 Numerical Public Health Risks Section 116470(b)(2) of the Health and Safety Code requires disclosure of the numerical public health risk, determined by OEHHA, associated with the MCLs, PHGs and MCLGs. Available numerical health risks developed by OEHHA for the contaminants identified above are shown on the accompany table. Only numerical risks associated with cancer -causing chemicals have been quantified by OEHHA. Bromate — OEHHA has determined the health risk associated with the PHG is 1 excess case of cancer in a million people and the risk associated with the MCL is 1 excess case of cancer in 10,000 people exposed over a 70-year lifetime. City of Tustin 3 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Gross Alpha — OEHHA has not established a PHG. USEPA has established an MCLG of 0. USEPA has determined the risk associated with the MCL is 1 excess case of cancer in 1,000 people exposed over a 70-year lifetime for the most potent alpha emitter. Gross Beta — OEHHA has not established a PHG. USEPA has established an MCLG of 0. USEPA has determined the risk associated with the MCL is 2 excess cases of cancer in 1,000 people exposed over a 70-year lifetime for the most potent beta emitter. Hexavalent Chromium — OEHHA has determined the health risk associated with the PHG is 1 excess case of cancer in a million people and the risk associated with the MCL is 5 excess cases of cancer in 10,000 people exposed over a 70-year lifetime. Perchlorate — OEHHA has not established a numerical health risk for perchlorate because PHGs for non -carcinogenic chemicals in drinking water are set at a concentration at which no known or anticipated adverse health risks will occur, with an adequate margin of safety. PFOA — OEHHA has determined the health risk associated with the PHG is 1 excess case of cancer in a million people. There is no California MCL for PFOA; therefore, the risk information associated with the MCL is not available/applicable. PFOS — OEHHA has determined the health risk associated with the PHG is 1 excess case of cancer in a million people. There is no California MCL for PFOS; therefore, the risk information associated with the MCL is not available/applicable. Radium, Combined — OEHHA has determined that the health risk associated with the PHG is 1 excess case of cancer in one million people over a 70-year lifetime exposure; and the risk associated with the MCL is 1 excess case of cancer in 10,000 people for radium-226 and 3 excess cases of cancer in 10,000 people for radium-228 over a 70-year lifetime exposure. Uranium — OEHHA has determined the health risk associated with the PHG is 1 excess case of cancer in a million people and the risk associated with the MCL is 5 excess cases of cancer in 100,000 people exposed over a 70-year lifetime. City of Tustin 4 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F 5.0 Identification of Risk Categories Section 116470(b)(3) of the Health and Safety Code requires identification of the category of risk to public health associated with exposure to the contaminant in drinking water, including a brief, plainly worded description of those terms. The risk categories and definitions for the contaminants identified above are shown on the accompanying table. 6.0 Description of Best Available Technology Section 116470(b)(4) of the Health and Safety Code requires a description of the BAT, if any is available on a commercial basis, to remove or reduce the concentrations of the contaminants identified above. The BATs are shown on the accompanying table. 7.0 Costs of Using Best Available Technologies and Intended Actions Section 116470(b)(5) of the Health and Safety Code requires an estimate of the aggregate cost and cost per customer of utilizing the BATs identified to reduce the concentration of a contaminant to a level at or below the PHG or MCLG. In addition, Section 116470(b)(6) requires a brief description of any actions the water purveyor intends to take to reduce the concentration of the contaminant and the basis for that decision. Bromate — The BATs for removal of bromate in water for large water systems are: coagulation/filtration optimization, granular activated carbon, and reverse osmosis. Bromate was detected above the PHG in the treated surface water purchased from MWDSC. The City is in compliance with the MCL for bromate. The estimated cost to reduce bromate levels in MWDSC water to below the PHG of 0.1 microgram per liter (lag/1) using reverse osmosis was calculated. Because the DDW detection limit for purposes of reporting (DLR) for bromate is 1 lag/I, treating bromate to below the PHG level means treating bromate to below the DLR of 1 lag/I. There are numerous factors that may influence the actual cost of reducing bromate levels to the PHG. Achieving the water quality goal for bromate could range from approximately $2,140,000 to $18,300,000 per year, or between $151 and $1,290 per service connection per year. City of Tustin 5 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F Gross Alpha, Gross Beta, Combined Radium, and Uranium — The only BAT for the removal of gross alpha in water for large water systems is reverse osmosis, which can also remove gross beta, combined radium, and uranium, if detected. Gross alpha was detected above the MCLG in the local groundwater (two wells; however, water from the 17th Street Well 4 is currently processed by the reverse osmosis system at the 17th Street Desalter), treated surface water purchased from MWDSC, and treated groundwater purchased from EOCWD. Gross beta was detected above the MCLG in the treated surface water purchased from MWDSC. Combined radium was detected above the MCLG in the treated groundwater purchased from EOCWD. Uranium was detected above the PHG in the local groundwater (three wells; however, water from the 17th Street Well 4 and Newport Well 3 is currently processed by the reverse osmosis system at the 17th Street Desalter), the surface water purchased from MWDSC, and treated groundwater purchased from EOCWD. The cost of providing treatment using reverse osmosis to reduce gross alpha levels to the MCLG of 0 picoCurie per liter (pCi/I) (and consequently gross beta to below the MCLG of 0 pCi/I, combined radium to below the MCLG of 0 pCi/I, and uranium in to below the PHG of 0.43 pCi/I) was calculated. Because the DLR for gross alpha is 3 pCi/I, treating gross alpha to 0 pCi/I means treating it to below the DLR of 3 pCi/I (and treating gross beta, radium-226, radium-228, and uranium to below their respective DLRs of 4 pCi/I, 1 pCi/I, 1 pCi/I, and 1 pCi/I). Achieving the water quality goal for gross alpha could range from $2,630,000 to $22,500,000 per year, or between $186 and $1,590 per service connection per year. Hexavalent Chromium — The BATs for removal of hexavalent chromium in water for large water systems are: ion exchange, reduction/coagulation/filtration, and reverse osmosis. Hexavalent chromium was detected above the PHG in the local groundwater (six wells; however, water from the 17th Street Well 4 and Newport Well 3 is currently processed by the reverse osmosis system at the 17th Street Desalter) and treated groundwater purchased from EOCWD. The City is in compliance with the MCL for hexavalent chromium. The estimated cost to reduce hexavalent chromium levels in the groundwater to below the PHG of 0.02 pg/I using reduction/coagulation/filtration was calculated. Because the DDW DLR for hexavalent chromium is 0.1 pg/I, treating hexavalent chromium to below the PHG level means treating hexavalent chromium to below the DLR of 0.1 pg/I. There are numerous factors that may influence the actual cost of reducing hexavalent chromium levels to the PHG. Achieving the water quality goal for hexavalent chromium could be approximately $1,000,000 to $6,270,000 per year, or between $71 and $443 per service connection per year. City of Tustin 6 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F Perchlorate — The BATs for removal of perchlorate in water for large water systems are ion exchange and biological fluidized bed reactor. Perchlorate was detected above the PHG in the local groundwater (six wells). The City is in compliance with the MCL for perchlorate. The estimated cost to reduce perchlorate levels in the groundwater to below the PHG of 1 pg/I using ion exchange was calculated. Because the DLR for perchlorate is 1 pg/I, treating perchlorate to below the PHG level means treating perchlorate to below the DLR of 1 pg/I. There are numerous factors that may influence the actual cost of reducing perchlorate levels to the PHG. Achieving the water quality goal for perchlorate could be approximately $807,000 to $1,770,000 per year, or between $57 and $125 per service connection per year. PFOS and PFOA — The BATs for removal of PFOS and PFOA in water for large water systems are: granular activated carbon, ion exchange, and reverse osmosis. PFOS and PFOA were detected above their respective PHGs in the local groundwater (six wells). The City is in compliance with the State requirements for PFOS and PFOA. Currently, the City has an ion exchange treatment system for the treatment of PFOS and PFOA detected in the groundwater extracted from one of the City's water supply wells (Columbus Well); the City's existing reverse osmosis treatment system is capable of treating PFOS and PFOA detected in the groundwater extracted from another two of the City's water supply wells (17th Street Well 4 and Newport Well 3); and the City, in 2021, proactively shut down the remaining wells impacted by the PFOS and PFOA contamination (Main Street Well 4, Pasadena Well, and Vandenberg Well), pending further action by the City. Since the discovery of the PFOS and PFOA contamination, the City has constructed a centralized ion exchange treatment facility capable of treating the remaining City wells. All Contaminants — In addition, a cost estimate to treat all water produced by the City using ion exchange and reverse osmosis to remove all the contaminants detected above the PHGs or MCLGs was calculated (excluding the water from the 17th Street Well 4 and Newport Well 3 which is currently processed by the reverse osmosis system at the 17th Street Desalter). All the contaminants listed in the accompanying table may be removed to non -detectable levels by ion exchange and reverse osmosis. As shown on the accompanying table, achieving the water quality goals for all contaminants using ion exchange and reverse osmosis could range from $3,440,000 to $24,300,000 per year, or between $243 and $1,720 per service connection per year. City of Tustin 7 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F For additional information, please contact Mr. Mike Chandler at (714) 573-3178, or write to the City of Tustin Water Services, 300 Centennial Way, Tustin, California 90780. JA2471\2471-005 Tustin 2025 PHG\Tustin 2025 PHG text Final.docx City of Tustin 8 2025 PHGs Report Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F 2025 PUBLIC HEALTH GOALS REPORT CITY OF TUSTIN UNITS PHG MCL DLR CONCENTRATION CATEGORY CANCER RISK CANCER BEST AGGREGATE COST PER PARAMETER OF OR OR OF AT PHG RISK AVAILABLE COST SERVICE CONNECTION VALUE RANGE MEASUREMENT (MCLG)* (CCRDL) RISK OR MCLG AT MCL TECHNOLOGIES PER YEAR PER YEAR INORGANIC CHEMICALS Bromate lag/I 0.1 10 1 ND ND - 6.3 C 1 x 10-6 1 x 10-4 C/F, GAC, RO $2,140,000 - $18.300,000 (a) $151 - 1,290 (a) Hexavalent Chromium lag/I 0.02 10 0.1 0.21 ND - 0.55 C 1 x 10-6 5 x 10-4 IE, R/C/F, RO $1,000,000 - $6,270,000 (b) $71 - $443 (b) Perchlorate lag/I 1 6 1 ND ND - 2.7 E NA NA IE, BFBR $807,000 - $1,770,000 (c) $57 - $125 (c) ORGANIC CHEMICALS Perfluorooctanesulfonic Acid (PFOS) ng/I 1 4 — (4) ND ND - 5.4 *** C 1 x 10-6 (d) GAC, IE, RO $0 (e) $0 (e) Perfluorooctanoic Acid (PFOA) ng/I 0.007 4 ** (4) ND ND - 5 *** C 1 x 10-6 (d) GAC, IE, RO -- -- RADIOLOGICAL Gross Alpha Particle Activity pCi/I (0) 15 3 ND ND-5 C 0 1 x 10-3 RO $2,630,000 - $22,500,000 (f) $186 - $1,590 (f) Gross Beta Particle Activity pCi/I (0) 50 4 ND ND-9 C 0 2 x 10-3 IE, RO -- -- Radium, Combined (g) pCi/I (0) 5 1 (g) ND ND - 1.4 C 1 x 10-6 3 x 10-4 IE, LS, RO -- -- Uranium pCi/I 0.43 20 1 1.2 ND-3 C 1 x 10-6 5 x 10-5 IE, RO, LS,C/F -- -- ALL CONTAMINANTS -- -- -- -- -- -- -- -- -- IE and RO $3,440,000 - $24,300,000 (h) $243 - $1,720 (h) MCI -Gs are shown in parentheses. MCLGs are provided only when no applicable PHG exists. ** Federal MCL *** Range of detections reported before the effective Federal MCL compliance date of April 26, 2029. RISK CATEGORIES C (Carcinogen) = A substance that is capable of producing cancer. E (Endocrine Toxicity and Developmental Toxicity) = A substance that can affect the thyroid or cause neurodevelopmental deficits. NOTES CCRDL = Consumer Confidence Report Detection Level DLR = Detection Limit for Purposes of Reporting MCL = Maximum Contaminant Level MCLG = Maximum Contaminant Level Goal lag/I = micrograms per liter or parts per billion NA = Not Applicable ND = Not Detected ng/I = nanograms per liter or parts per trillion pCi/I = picoCuries per liter PHG = Public Health Goal TREATMENT TECHNOLOGIES BFBR = Biological fluidized Bed Reactor C/F = Coagulation/Filtration GAC = Granular Activated Carbon IE = Ion Exchange LS = Lime Softening R/C/F = Reduction/Coagulation/Filtration RO = Reverse Osmosis (a) Estimated cost to remove bromate using RO. (b) Estimated cost to remove hexavalent chromium using R/C/F. The existing RO system at the 17th Street Desalter also processes water from the 17th Street Well 4 and Newport Well 3; therefore, the cost excludes these wells. (c) Estimated cost to remove perchlorate using IE. (d) Not applicable. Cancer risk cannot be calculated. (e) Estimated cost to remove PFOS and PFOA using IE. The existing RO system at the 17th Street Desalter also processes water from the 17th Street Well 4 and Newport Well 3; therefore, the cost excludes these wells. In addition, the existing IE system treats PFOA and PFOS at the Columbus well; therefore, the cost excludes this well. (f) Estimated cost to remove gross alpha particle activity using RO, which also removes combined radium, gross beta particle activity, and uranium. The existing RO system at the 17th Street Desalter also processes water from the 17th Street Well 4 and Newport Well 3; therefore, the cost excludes these wells. (g) As the sum of radium-226 and radium-228. DI -Rs for radium-226 and radium-228 is 1 pCi/L and 1 pCi/L, respectively. (h) Assuming treating the entire production by IE and RO, which can remove all contaminants listed in the above table to below the detectable levels. The existing RO system at the 17th Street Desalter also processes water from the 17th Street Well 4 and Newport Well 3; therefore, the cost excludes these wells. J:\2471\2471-005 Tustin 2025 PHG\Tustin_phglable_2025_Final.xlsx Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F ATTACHMENT 2 Annual Water Quality Reports for 2022, 2023, 2024 Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961 OC41 D36F v • wf Li's F1 Remembering what connects us. 2023 Water Quality Report City of Tustin Water Services Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F ince 1990, California public water utilities have been providing an annual Water Quality Report to their customers. This year's report covers calendar year 2022 drinking water quality testing and reporting. The City of Tustin Water Services Division (City) vigilantly safeguards its water supply and, as in years past, the water delivered to your home meets the quality standards required by federal and state regulatory agencies. The U.S. Environmental Protection Agency (USEPA) and the State Water Resources Control Board, Division of Drinking Water (DDW) are the agencies responsible for establishing and enforcing drinking water quality standards. In some cases, the City goes beyond what is required by testing for unregulated chemicals that Englebright Dam on the Yuba River may have known health risks but do not have drinking water standards. For example, the Orange County Water District (OCWD), which manages the groundwater basin, and the Metropolitan Water District of Southern California (MWDSC), which supplies imported treated surface water to the City, test for unregulated chemicals in our water supply. Unregulated chemical monitoring helps USEPA and DDW determine where certain chemicals occur and whether new Conserving Our Water Thank you! The City of Tustin wants to extend a heartfelt thank you to all our customers who continue to prioritize water use efficiency. With the welcome relief of a wet winter season, the Sierra snowpack is over 200% of normal, reservoirs are filling across the state, and discussions have begun about the end of the statewide drought. Now is our time to remain focused on continuing to use our water supplies efficiently. With the cyclical nature of California's weather, the next dry cycle is just around the corner. But the bigger challenge remains: California has limited water resources. So let's continue to do what we know how to do: Use our water efficiently. Let's do it for our families, our neighbors, our children, and our future. We know our residents understand the importance of this request and will always do their part to reduce water use and conserve our water supplies, and for that, we again say Thank you! standards need to be established for those chemicals. Through drinking water quality testing programs carried out by OCWD for groundwater, MWDSC for treated surface water and the City for the distribution system, your drinking water is constantly monitored from source to tap for regulated and unregulated constituents. The State allows us to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of our data, though representative, are more than one year old. This report contains important information about your drinking water. Translate it, or speak with someone who understands it. 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Aa*J,<VINT75 1��1" B� gl��AoRl�Tac�; _2_ Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Introduction Through drinking water quality testing programs carried out by the Orange County Water District (OCWD) for ground- water, Metropolitan Water District of Southern California (MWDSC) for treated surface water, and the City of Tustin for the water distribution system, your drinking water is constantly monitored from source to tap for constituents that are regulated and unregulated. Sources of Supply The City's water supply is a blend of local ground- water wells, and imported water connections originating from Northern California and the Colorado River by MWDSC via the Municipal Water District of Orange County (MWDOC). Groundwater comes from a natural underground aquifer that is replenished with water from the Santa Ana River, local rainfall, Groundwater Replenishment System (GWRS) recycled water, and imported water. The groundwater basin, which is managed by OCWD, is about 350 square miles. It lies beneath north and central Orange County, from Irvine to the Los Angeles County border and from Yorba Linda to the Pacific Ocean. More than 19 cities and retail water districts draw from the basin to provide water to homes and businesses. Orange County's Water Future For years, Orange County has enjoyed an abundant, seemingly endless supply of high -quality water. However, as water demand continues to increase statewide, we must be even more conscientious about our water supply and maximize the efficient use of this precious natural resource. OCWD implements and operates new and innovative water management and supply development programs, including water recycling, wetlands expansion, recharge facility construction, groundwater cleanup projects, storage programs, and water education programs for children through adults. MWDOC offers rebates and incentives to promote water -use efficiency and provides water education programs. Both agencies work cooperatively with Orange County retail water agencies to complete studies to assess water reliability in Orange County. These efforts are helping to enhance long-term countywide water reliability and water quality and a healthy water future for Orange County. Your local and regional water agencies are committed to making the necessary investments today in new water management projects to ensure an abundant and high -quality water supply for generations to come. Drinking Water Fluoridation Fluoride has been added to U.S. drinking water supplies since 1945. Of the 50 largest cities in the U.S., 43 fluoridate their drinking water. In December 2007, MWDSC joined a majority of the nation's public water suppliers in adding fluoride to drinking water in order to prevent tooth decay. MWDSC was in compliance with all provisions of the State's fluoridation system requirements. Our local water is not supplemented with fluoride. Fluoride levels in drinking water are limited under California state regulations at a maximum dosage of 2 parts per million. Additional information about the fluoridation of drinking water is available on these websites: U.S. Centers for Disease Control and Prevention 1 (800) 232-4636 ♦ www.cdc.gov/fluoridation/ State Water Resources Control Board, Division of Drinking Water www.waterboards.ca.gov/drinking—water/ certlic/drinkingwater/Fluoridation.html For more information about MWDSC's fluoridation program, please call Edgar G. Dymally at (213) 217-5709 or email him at edymally@mwdh2o.com. Wise Water Use is Good for Us All ♦ Check your sprinkler system for leaks, overspray, and broken sprinkler heads and repair promptly. This can save countless gallons each time you water. ♦ Water plants in the early morning. It reduces evaporation and ensures deeper watering. ♦ Use a broom instead of a hose to clean off sidewalks and drive- ways. It takes very little time to sweep and the water savings quickly adds up. ♦ Soak pots and pans instead of letting water run while you scrub them clean. This both saves water and makes the job easier. -3- Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F To Safeguard Against Issues that May Affect Your Health We Comply with All State &Federal Water Quality Regulations Basic Information About Drinking Water Contaminants The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over the surface of land or through the layers of the ground it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animal and human activity. Contaminants that may be present in source water include: ♦ Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife. ♦ Radioactive contaminants, which can be naturally occurring or be the result of oil and gas production or mining activities ♦ Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gasoline stations, urban stormwater runoff, agricultural application and septic systems. Nitrate Advisory ♦ Inorganic contaminants, such as salts and metals, which can be naturally occurring or result from urban storm runoff, industrial or domestic wastewater discharges, oil and gas production, mining and farming. ♦ Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban storm - water runoff and residential uses. ♦ Compliance: In order to ensure that tap water is safe to drink, USEPA and the DDW prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. The U.S. Food and Drug Administration regulations and California law also establish limits for contaminants in bottled water that must provide the same protection for public health. Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the USEPA's Safe Drinking Water Hotline at (800) 426-4791, or online at www.epa.gov/safewater. Tustin Water Service has detected nitrate in the local groundwater at levels ranging from non -detect (ND) - 6.7 mg/L, L with an average local groundwater detection of 4 mg/L. Nitrate in drinking water at levels above — 10 milligrams per liter (mg/L) is a health risk for infants of less than six months of age. Such nitrate levels in drinking water can interfere with the capacity of the infant's blood to carry oxygen, resulting in a serious illness; symptoms include shortness of breath and blueness of the skin. Nitrate levels above 10 mg/L may also affect the ability of the blood to carry oxygen in other individuals, such as pregnant women and those with certain specific enzyme deficiencies. If you are caring for an infant, or you are pregnant, you should ask advice from your health care provider. Where Do We Use Water the Most? Outdoor watering of lawns and gardens makes up approximately 60% of home water use. By reducing your outdoor water use — by either cutting back on irrigation or planting more drought tolerant landscaping — you can dramatically reduce your overall water use. Save the most where you use the most: Make your outdoor use efficient. *Showers & Baths: B% Q Clothes Washers: 9% 0 Toilets:11 % Dishwashers: 1 % 0 Leaks: 7% 0 Faucets: 6% Data is representative of average consumption; your water usage may vary. -4- Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41 D36F 7 �. About Lead in Tap Water disorders, some elder) persons and y p D r q If present, elevated levels of lead can cause infants can be particularly at risk to serious health problems, especially for _ infection. These people should seek ' pregnant women and young children. Lead in advice about drinking water from their drinking water is primarily from materials and health care providers. ` ^ components associated with service lines and The USEPA and the federal Centers I " home plumbing. The City is responsible for for Disease Control guidelines on providing high quality drinking water, but appropriate means to lessen the risk of „ _ Q cannot control the variety of materials used in plumbing infection by Cryptosporidiumsnd other microbial i. components. contaminants are available from USEPA's Safe Drinking 4 G Q When your water has been sitting for several hours, you Water hotline at (800) 426-4791, or on the web at `^'wvvepa.gov/safewater. 0 _ can minimize the potential for lead exposure by flushing 0 your tap for 30 seconds to 2 minutes before using water for Entrained Air drinking or cooking. "milky" ,a� a If you are concerned about lead in your water, you may If your tap water has a slightly appearance, r- 0- Q wish to have your water tested. Information on lead in you're probably experiencing an interesting but harmless drinking water, testing methods, and steps you can take phenomenon known as "entrained air." 4 to minimize exposure is available from the Safe Drinking The milk color in the water caused b tin air bubbles Y Y Y C Water Hotline at (800) 426-4791, or on the web at is harmless and is related to the operation of City p y wells. J� J - www.epa.gov/safewater/lead. The air is dissolved under pressure in the groundwater, 00 le romised People P P much like carbon dioxide in a bottle of soda. If your tap D r� water is milky -colored and you want to confirm you are 0 1 Some people may be more vulnerable to contaminants experiencing entrained air, rinse out a clear glass twice and in drinking water than the general population. Immuno- then fill it with cold tap water. After a few moments, the p' I compromised people, such as those with cancer who are water should begin to clear from the bottom of the glass to v O undergoing chemotherapy, persons who have had organ transplants, HIV/AIDS immune the top as the bubbles rise to the surface. If the water does ' _ people with or other system not clear, please contact us. C. 0 t ^ - Lf - • " � ti 1 V � LJ � n n �. '•'0� "o, LJ G� n a � a Chart Legend What are Water Quality Standards? What is a Water Quality Goal? Drinking water standards established by USEPA and DDW set limits for substances In addition to mandatory water quality standards, USEPA' ' that may affect consumer health or aesthetic qualities of drinking water. The charts and DDW have set voluntary water quality goals for C r in this report show the following types of water quality standards: some contaminants. Water quality goals are often set at r c • Maximum Contaminant Level (MCL): The highest level of a contaminant that is such low levels that they are not achievable in practice CIFr C ^ allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) and are not directly measurable. Nevertheless, these as is economically and technologically feasible. goals provide useful guideposts and direction for water C' d ' .7 � Maximum Residual Disinfectant Level (MRDL): The highest level of a disinfectant management practices. The charts in this report include allowed in drinking water. There is convincing evidence that addition of a G ' three types of water quality goals: ^ disinfectant is necessary for control of microbial contaminants. •Maximum Contaminant Level Goal (MCLG): Secondary MCLs: Set to protect the odor, taste, and appearance of drinking water. The level of contaminant in drinking water below 3 a • Primary Drinking Water Standard: MCLs for contaminants that affect health i along with their monitoring and reporting requirements and water treatment which there s no known or expected risk to health. 7 ^ requirements. MCLGs are set by USEPA. • Maximum Residual Disinfectant Level Goal (MRDLG):O •Regulatory Action Level (AL): The concentration of a contaminant which, if Cr - - exceeded, triggers treatment or other requirements that a water system must The level of a drinking water disinfectant below which follow. there is no known or expected risk to health. MRDLGs ' How are Contaminants Measured? do not reflect the benefits of the use of disinfectants to Water is sampled and tested throughout the year. Contaminants are measured in: control microbial contaminants. r ry •parts per million (ppm) or milligrams per liter (mg/L) Public Health Goal (PHG): The level of a contaminant • parts per billion (ppb) or micrograms per liter (pg/L) in drinking water below which there is no known or expected risk to health. PHGs are set by the California r parts per trillion (ppt) or nanograms per liter (ng/L) Environmental Protection Agency. qq h 7 r} y r n + �.01�� b n M fir} r r ■ Docusign Envelope ID: 38064E8A-4F76-44F 82D5-F9610C411)36FMyX- r r -� •. Wry y 4 1 • • • G Local Groundwater and Metropolitan Water District (MWD) of Southern California Treated Surface Water Average Average Range Contam�inantMCL PHIG Local (MCLG) Groundwater Surface Water of Detections MCL Violation? Typical Source of Contaminant .� Radiologicals- Tested in 2020 and 2022 Gross Alpha Particle Activity (pCi/L) 15 (0) ND ND ND-3 No Erosion of Natural Deposits ]• Gross Beta Particle Activity (pCi/L) 50 (0) NR 6 ND-9 No Decay of Natural and Man-made Deposits V , fJ- - _ Uranium (pCi/L) 20 0.43 1.3 2 ND-3 No Erosion of Natural Deposits Inorganic Contaminants -Tested in 2022 )- Aluminum (ppm) 1 0.6 <0.05 0.14 ND - 0.21 No Treatment Process Residue, Natural Depositsco 4 G p Barium (ppm) 1 2 <0.1 0.107 ND - 0.107 No Refinery Discharge, Erosion of Natural Deposits hr v` Fluoride (ppm) 2 1 0.16 NR 0.14 - 0.2 No Erosion of Natural Deposits - Fluoride (ppm) treatment -related 2 1 NR 0.7 0.7 - 0.8 No Water Additive for Dental Health C' Q Nitrate (ppm as N) 10 10 4 ND ND - 6.7 No Fertilizers, Septic Tanks ` �. Nitrate+Nitrite (ppm as N) 10 10 4 ND ND-6.7 No Fertilizers, Septic Tanks 0 Perchlorate (ppb) 6 1 <2 ND ND-2.7 No Industrial Discharge -` Selenium (ppb) 50 30 <5 ND ND - 5.8 No Treatment Process Residue, Natural Deposits V° 4 Secondary Standards* -Tested in 2022 3 C Aluminum (ppb) 200* 600 <50 140 ND-210 No Treatment Process Residue, Natural Deposits - Chloride (ppm) 500* n/a 126 101 31.4 - 236 No Runoff or Leaching from Natural Deposits J Color (color units) 15* n/a ND 1 ND- 1 No Naturally -occurring Organic Materials �j Odor (threshold odor number) 3* n/a ND 3 ND-3 No Naturally -occurring Organic Materials J V Specific Conductance (pmho/cm) 1,600* n/a 1800** 988 567 -1,840 No Substances that Form Ions in Water [1 7 Sulfate (ppm) 500* n/a 159 221 82.4- 233 No Runoff or Leaching from Natural Deposits +- Total Dissolved Solids (ppm) 1,000* n/a 450 628 140 - 712 No Runoff or Leaching from Natural Deposits Turbidity (NTU) 5* n/a 0.21 ND ND-0.55 No Erosion of Natural Deposits.}.+' r' M Unregulated Contaminants - Tested in 2018, 2020, and 2022 4 Alkalinity, total as CaCO3 (ppm) Not Regulated n/a 208 126 125 - 277 n/a Runoff or Leaching from Natural Deposits U Boron (ppm) NL = 1 n/a 0.11 0.13 ND - 0.2 n/a Runoff or Leaching from Natural Deposits ' Bromide (ppm) Not Regulated n/a 0.26 NR 0.083 - 0.68 n/a Industrial Discharge C. 0 t ^ - Calcium (ppm) Not Regulated n/a 112 68 38.6 -178 n/a Runoff or Leaching from Natural Deposits Q O 0 Germanium (ppm) Not Regulated n/a ND 0.1 ND - 0.4 n/a Erosion of Natural Deposits; Industrial Discharge A'4 4j Hardness, total as CaCO3 (ppm) Not Regulated n/a 404 278 136 - 650 n/a Runoff or Leaching from Natural Deposits Hardness, total (grains/gallon) Not Regulated n/a 24 16 8 - 38 n/a Runoff or Leaching from Natural Deposits r c Magnesium (ppm) Not Regulated n/a 29.6 25 7.3 - 51.8 n/a Runoff or Leaching from Natural Deposits • :0 Manganese (ppb)*** 50* n/a 0.75 1.9 ND - 2.9 n/a Erosion of Natural Deposits ry pH (pH units) Not Regulated n/a 7.8 8.1 7.6-8.1 n/a Hydrogen Ion Concentration Potassium (ppm) Not Regulated n/a 2.5 4.6 1.7 - 4.8 n/a Runoff or Leaching from Natural Deposits r 0 Sodium (ppm) Not Regulated n/a 89 98 70 -131 n/a Runoff or Leaching from Natural Deposits C r 0 Total Organic Carbon (ppm) TT n/a <0.3 2.5 ND - 2.6 n/a Various Natural and Man-made Sources CF C Total Organic Carbon (ppm)**** Not Regulated n/a 0.28 NR 0.12 - 0.6 n/a Various Natural and Man-made Sources ^ e _ - ppb = parts -per -billion; ppm = parts -per -million; ppt = parts -per -trillion; pCi/L = picoCuries per liter; NTU = nepl,lometric turbidity units; pm1okm = micromhos per centimeter; _ G /r NR = Not Required to be analyzed; ND = not detected; < = average is less than the detection limit for reporting purposes; MCL = Maximum Contaminant Level; (MCLG) PHG = California Public Health Goal; NL = Notification Level; RL = Response Level; n/a = not applicable; IT = treatment technique = federal MCL Goal; r _ *Contaminant is regulated by a secondary standard. **Reported averages includes raw water sources, delivered water is below the secondary MCL. ***Manganese 3 a is regulated with a secondary standard of 50 ppb but was not detected, based on the detection limit for purposes of reporting of 20 ppb. rr ., Manganese was included as part of the unregulated contaminants requiring monitoring. 0 Clio 7 - ****Total organic carbon were also included as part of the unregulated contaminants requiring monitoring. - combined filter effluent Treatment Turbidity TT Typical Source FiltrationTurbidity Metropolitan Water District Diemer Technique Violation? 1) Highest single turbidity measurement (NTU) 0.3 0.03 No Soil run-off r _ ry 2) Percentage of samples less than or equal to 0.3 NTU 95% 100% No Soil run-off �yF Turbidity is a measure of the cloudiness of the water, an indication of particulate matter, some of which might include harmful microorganisms. Low turbidity in Metropolitan's treated water is a good indicator of effective filtration. Filtration is called a "treatment technique" (7). r - A treatment technique is a required process intended to reduce the level of contaminants in drinking water that are difficult and sometimes impossible to measure directly. . � � f ''S � ry� � � 7 /L ��+ � � r f� � ��r/� ^ "r1. nn `n � a �• r�rC4!� Lr �L� Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41 D36F W. J 2022 City of • • • -' _ �J •• •• Detections►--. � Total Trihalomethanes (ppb) 80 34 ND-46 No Byproducts of Chlorine Disinfection _ ` Haloacetic Acids (ppb) 60 11 ND— 15 No Byproducts of Chlorine Disinfection .� Chlorine Residual (ppm) (4/4) 1.4 1.24-1.62 No Disinfectant Added for Treatment ' Aesthetic Quality Turbidity (NTU) 5* <0.1 ND — 0.13 No Erosion of Natural Deposits - �' Eight locations in the distribution system are tested quarterly for total trihalomethanes and haloacetic acids; twenty locations are tested monthly for color, odor and turbidity. ' Color and odor were not detected in 2022. C ti I MRDL = Maximum Residual Disinfectant Level; MRDLG = Maximum Residual Disinfectant Level Goal Q � *Contaminant is regulated by a secondary standard to maintain aesthetic qualities (taste, odor, color). hr v` _ QLead and Copper ` 7.,0 r 0 Lead (ppb) 15 0.2 ND 0 / 53 No Corrosion of Household Plumbing ,3 Copper (ppm) 1.3 0.3 0.17 0 / 53 No Corrosion of Household Plumbing � c 40 During August 2021, 53 residences were tested for lead and copper at -the -tap. C Lead was detected in two samples; none exceeded the regulatory action level. Copper was detected in 38 homes; none exceeded the regulatory action level. A regulatory action level is the concentration of a contaminant which triggers treatment or other requirements that a water system must follow. J hUnregulatedChemicalsRequiring Monitoring in theDistribution -- 70° +- r Bromochloroacetic Acid (ppb) n/a n/a 0.68 Detections ND — 3.8 SamplingDate 2020 I Bromodichloroacetic Acid (ppb) n/a n/a 0.26 ND-2.8 2020 D ChlorodibromoaceticAcid (ppb) n/a n/a 0.2 ND-1.2 2020 U 4 Dibromoacetic Acid (ppb) n/a n/a 0.98 ND — 2.1 2020 Dichloroacetic Acid (ppb) n/a MCLG=0 0.76 ND-6.1 2020C. {S Monobromoacetic Acid (ppb) n/a n/a 0.06 ND — 0.4 2020 TrichloroaceticAcid (ppb) n/a MCLG=20 0.28 ND-4.3 2020 11 .n ii _ C` .. r () _ l Jf ]r r, .. b r w r Source Water Assessments Imported (MWDSC) Water Assessment Every five years, MWDSC is required by DDW to examine possible sources of drinking water contamination in its State Water Project and Colorado River source waters. The most recent surveys for MWDSC's source waters are the Colorado River Watershed Sanitary Survey - 2020 Update, and the State Water Project Watershed Sanitary Survey - 2021 Update. Water from the Colorado River is considered to be most vulnerable to contamination from recreation, urban/stormwater runoff, increasing urbanization in the watershed, and wastewater. Water supplies from Northern California's State Water Project are most vulnerable to contamination from urban/stormwater runoff, wildlife, agriculture, recreation, and wastewater. USEPA also requires MWDSC to complete one Source Water Assessment (SWA) that utilizes information collected in the watershed sanitary surveys. MWDSC completed its SWA in December 2002. The SWA is used to evaluate the vulnerability of water sources to contamination and helps determine whether more protective measures are needed. A copy of the most recent summary of either Watershed Sanitary Survey or the SWA can be obtained by calling MWDSC at (800) CALL-MWD (225-5693). Groundwater Assessment An assessment of the drinking water sources for the City was completed in December 2002. The groundwater sources are considered most vulnerable to the following activities not associated with detected contaminants: confirmed leaking underground storage tanks, dry cleaners, and gas stations. The groundwater sources are considered most vulnerable to the following activities associated with contaminants detected in the water supply: known contaminant plumes, historic agricultural activities and application of fertilizers, and sewer collection systems. A copy of the complete assessment is available at State Water Resources Control Board, Division of Drinking Water, 2 MacArthur Place, Suite 150, Santa Ana, California 92707. You may request a summary of the assessment by contacting the City of Tustin Water Services at (714) 361-4719. Pei In I 01 Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F J ^w City of Tustin PRESORT STD Water Services U.S. Postage 1 V J 1 1 N 300 Centennial Way P A I D Tustin, California 92780 Santa Ana, CA Remembe • Permit No.1208 You Can Have Confidence in the Quality of Your Water The City of Tustin Water Services is pleased to distribute this report to its water customers. It provides important information about where your water comes from and the work we perform each day to assure the water delivered to your tap meets all Federal and State drinking water standards. The tap water that comes out of your faucet has to meet rigorous State and Federal regulatory standards; otherwise, we wouldn't be able to deliver it to your home. Our annual water quality report shares details about the water you receive. You can see for yourself that we are meeting and even exceeding standards required to maintain water quality. Take a look inside for details on water sources, the constituents found in the water, and how our water compares with State and Federal standards. The City of Tustin Water Services is committed to safe- guarding its water supply and ensuring that your tap water is safe to drink. We also strive to keep you informed about the quality of your water supply. We Invite You Four r information about this report, or to Learn More water quality in general, please contact Mike Chandler at (714) 573-3178. About Your The Tustin City Council meets the first Water's Quality and third Tuesdays of every month at 7:00 pm in the City Council Chambers, 300 Centennial Way, Tustin, California. Please feel free to participate in these meetings. For more information about the health effects of the listed contaminants in the following tables, call the USEPA hotline at (800) 426-4791. Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Where Does Our Water Come From? l h�pl OF l � tiF Ar u — m Trinity Y o Lake C'gItFOPN�P Shasta Lake REDDING 0 / Lake Oroville Sacramento QpN W4rF River F l SACRAMENTO �G r Managed by the Metropolitan Water District of Southern California, the Colorado River SA Aqueduct begins near Parker Dam FRANCISC on the Colorado River. There, the Gene Pumping Station lifts the water over 300 feet as it begins its 242 mile journey to Lake Mathews, just outside the City of Corona. Along the way, the water passes through two reservoirs, five pumping stations, 62 miles of 00 canals, and 176 miles of tunnels, buried conduits and siphons. All told, the water is lifted four times, a total of more than 1,300 feet. kbu woo �w ' I ti r Qv D t3h a d a ... and How Does It Get to Us? fw. Have you ever wondered where your water comes from? Here in the City of Tustin +� our water is drawn from local groundwater supplies then blended with water ° imported from both Northern California and the Colorado River. Water from Northern California travels to us through a complex delivery system known as the California State Water Project. Designed and built in the 1960s, the State Water Project is one of the largest public water and power utilities in the world, providing drinking water for more than 25 million people statewide. a Feather River kF.isiomi Lake _ New r New The Reservoir Bay -Delta San Joaquin River Millerton Lake California Aqueduct STATE WATER PROJECT BAKERSFIELD Lake Isabella Chrisman Pumping Edmonston Plant - Pumping Plant After its journey across the Mojave N HE COL OR AD ; UCT - Pyramid Lake Desert, the water descends into the Coachella Valley and through the San Gorgonio Pass. ' Near Cabazon, the aqueduct flows underground, passing beneath P A C I F I C the San Jacinto Mountains and continuing until it reaches its OCEAN terminus at Lake Mathews. From there,156 miles of distribution lines, lob along with eight more tunnels and five drinking water treatment plants, delivers treated water throughout Southern California. Managed by the California Department of Water Resources, the project stretches over 700 miles, from Lake Oroville in the north to Lake Perris in the south. Water stored in Lake Oroville, Folsom Lake, and other tributaries, and fed by snow melt from the Sierra Nevada Mountains, flows into the Sacramento and San Joaquin rivers, and from there into reservoirs in the Bay -Delta region. From the Bay -Delta, giant pumps lift the water into the 444-mile-long California Aqueduct, there to flow southward to cities and farms in Central and Southern California. Composed mainly of concrete -lined canals, the Aqueduct also includes over 20 miles of tunnels, more than 130 miles of pipelines, and 27 miles of siphons. Along the way, the water is pumped 2,882 feet over the Tehachapi Mountains. The Edmonston Pumping Plant alone lifts millions of gallons a day up 1,926 feet, the highest single water lift in the world. Is it any wonder the State Water Project is the largest single consumer of power in the /\ State of California? Silverwood Colorado Lake Aqueduct Lake Lake LOS ANGELES Lake Mathews ORANGE COUNTY SAN D EGO i �l Gene Pumping Station Colorado River Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C4lD36F How Does Our Water Get to Us? Water r from State Water Project Reservoir —r Colorado River Aqueduct Water T� qp7 D Treaatmnt L: -: 'Metropolitan Plan Water District t of Southern California Wets (via MWD of Orange County) r ) ant Ana 1 River n nc� WaterDistdct Groundwater `Storage i r Tank Commercial The City of Tustin Water Services vigorously works to ensure the safety of your drinking water and, in conjunction with MWDSC and OCWD, continuously monitors the water to verify adherence with drinking water regulations. Importing water from hundreds of miles away is only the start to providing you clean, fresh water. Once the water is in the southland, the Metropolitan Water District of Southern California, in partnership with the Municipal Water District of Orange County, treats and pumps the water to individual cities throughout Orange County. The Orange County Water District, which manages the groundwater basin beneath Central and Northern Orange County, ensures the quality and supply of groundwater throughout its service area. The City of Tustin sits atop the county aquifer and draws water from this local source, then blends it with the imported surface water. Big Bear San Bernardino Cascading from its source high in the San Bernardino ' Reservoir Mountains �J Mountains, the Santa Ana River is fed by a watershed } over Z500 square miles in area. River water is captured behind Prado Dam and slowly released - seven to help replenish the Orange County Groundwater Dam Basin. Percolation ponds in Anaheim and Orange Wetlands hold this water so it can seep into the basin. i Ili, Iki Ill4 - - Prado -- -- Dam Drinking Water ' ce Ocean Santa Ana River Z SupplyWell `. Percolation_ Ponds Orange County Groundwater Basin _ (Aquifer) Southern California has an arid climate and wise water use needs to become a part of everyone's daily lives. For as finite as our water resources are, they get smaller every year. Simple water saving acts like the ones listed here can save countless gallons of water every day. Soak pots and pans instead of letting water run while you scrub them clean. This both saves water and makes the job easier. Keep a pitcher of drinking water in the refrigerator. This can save gallons of water every day and it's always cold! Plug the sink instead of running water to rinse your razor or wet i� your toothbrush. This can save upwards of 300 gallons of water a month. Use a broom instead of a hose to clean off sidewalks and driveways. It takes very little time to sweep and the water savings quickly adds up. Check your sprinkler system for leaks, overspray, and broken sprinkler heads and repair promptly. This can save countless gallons each time you water. Water plants in the early morning. It reduces evaporation and • ensures deeper watering. Where Do We Use Water the Most? Outdoor watering of lawns and gardens makes up approximately 60% of home water use. By reducing your outdoor water use — by either cutting back on irrigation or planting more drought tolerant landscaping — you can dramatically reduce your overall water use. Save the most where you use the most: Make your outdoor use efficient. * Showers & Baths: 8 % J Toilets: 11 % Clothes Washers: 9 % 0 Leaks: 7 % Dishwashers: 1 % Q Faucets: 6% Data is representative of average consumption; —.0ill your water usage may vary. Where Can You Learn More? There's a wealth of information on the internet about Drinking Water Quality and water issues in general. Some good sites to begin your own research are: Metropolitan Water District of So. California: www.mwdh2o.com California Department of Water Resources: www.water.ca.gov The Water Education Foundation: www.watereducation.org To learn more about Water Conservation & Rebate Information: www.bewaterwise.com • www.ocwatersmart.com And to see the Aqueducts in action, checkout these two videos: Wings Over the State Water Project: youtu.be/8A1vlRr2neU Wings Over the Colorado Aqueduct: youtu.be/KipMQh5tOf4 - � N City of Tustin Water Services 300 Centennial Way • Tustin, California 92780 Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F �N 2024 water Quality Report k C. . epl o UT,N Remembering what connects us. City of Tustin Water Services k-%Y This report reflects water quality testing conducted during 2023. 0 Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F ince 1990, California public water utilities have been providing an annual Water Quality Report to their customers. This year's report covers calendar year 2023 drinking water quality testing and reporting. The City of Tustin Water Services Division (City) vigilantly safeguards its water supply and, as in years past, the water delivered to your home meets the quality standards required by federal and state regulatory agencies. The U.S. Environmental Protection Agency (USEPA) and the State Water Resources Control Board, Division of Drinking Water (DDW) are the agencies responsible for establishing and enforcing drinking water quality standards. In some cases, the City goes beyond what is required by testing for unregulated chemicals that may have Known health risks but do not have Whitsett Intake Pumping Plant on the Colorado River. drinking water standards. For example, the Orange County Water District (OCWD), which manages the groundwater basin, and the Metropolitan Water District of Southern California (MWDSC), which supplies imported treated surface water to the City, test for unregulated chemicals in our water supply. Unregulated Quality Water is Our Priority Turn the tap and the water flows, as if by magic. Or so it seems. The reality is considerably different, however. Delivering high -quality drinking water to our customers is a scientific and engineering feat that requires consider- able effort and talent to ensure the water is always there, always safe to drink. Because tap water is highly regulated by state and federal laws, water treatment and distribution operators must be licensed and are required to complete on-the-job training and technical education before becoming a state certified operator. Our licensed water professionals have an understanding of a wide range of subjects, including mathematics, biology, chemistry, physics, and engineering. Some of the tasks they complete on a regular basis include: ♦ Operating and maintaining equipment to purify and clarify water; ♦ Monitoring and inspecting machinery, meters, gauges, and operating conditions; ♦ Conducting tests and inspections on water and evaluating the results; ♦ Documenting and reporting test results and system operations to regulatory agencies; and ♦ Serving our community through customer support, education, and outreach. So, the next time you turn on your faucet, think of the skilled professionals who stand behind every drop. chemical monitoring helps USEPA and DDW determine where certain chemicals occur and whether new standards need to be established for those chemicals. Through drinking water quality testing programs carried out by OCWD for groundwater, MWDSC for treated surface water and the City for the distribution system, your drinking water is constantly monitored from source to tap for regulated and unregulated constituents. The State allows us to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of our data, though representative, are more than one year old. This report contains important information about your drinking water. Translate it, or speak with someone who understands it. Este informe contiene informucion muy 43an bao cao c6 ghi nhUng chi irnportuntesobresuaguupotable. tiet quan trong vepham chat Pura musinformucionotruducci6n, nu'dc trong Gong dong quy vi. fuvor de contuctur a Customer Hay nhtl ngdai thon% dich, hofc Service Representative. Telefono: h6i mot ngtf6i ban NCRrod ve van (714) 573-3350. de nay. �,�r.Jl cL�-eycy arc tol—a 1�4Y1i��%��fT �t �f��`7h a`J AA dji.��y fir_...r: l # Jet —T, :CK e..0 "-I— JJ 1s- — t7— • 1��* To of )-1AL Ao_[7[ 71T84L M12i21 Tz1a1 LFi_5� 79SaF oi_Y_ 74 zoi-it aL14. ol'�z `aw �4_71L4 fS ul 018Hs4A1tf 24 J21-41_1n19. L0)A34(z1J:, J5tat 0)AX*-4* Icy t �Zo�j�tAta'I�t�t a ���. -CogzT. Aa*J,<VINT75 1��1" Q� gl�i�AoRl�Tac�; -2- Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Introduction Through drinking water quality testing programs carried out by the Orange County Water District (OCWD) for ground- water, Metropolitan Water District of Southern California (MWDSC) for treated surface water, and the City of Tustin for the water distribution system, your drinking water is constantly monitored from source to tap for constituents that are regulated and unregulated. Sources of Supply The City's water supply is a blend of local ground- water wells, and imported water connections originating from Northern California and the Colorado River by MWDSC via the Municipal Water District of Orange County (MWDOC). Groundwater comes from a natural underground aquifer that is replenished with water from the Santa Ana River, local rainfall, Groundwater Replenishment System (GWRS) recycled water, and imported water. The groundwater basin, which is managed by OCWD, is about 350 square miles. It lies beneath north and central Orange County, from Irvine to the Los Angeles County border and from Yorba Linda to the Pacific Ocean. More than 19 cities and retail water districts draw from the basin to provide water to homes and businesses. Orange County's Water Future For years, Orange County has enjoyed an abundant, seemingly endless supply of high -quality water. However, as water demand continues to increase statewide, we must be even more conscientious about our water supply and maximize the efficient use of this precious natural resource. OCWD implements and operates new and innovative water management and supply development programs, including water recycling, wetlands expansion, recharge facility construction, groundwater cleanup projects, storage programs, and water education programs for children through adults. MWDOC offers rebates and incentives to promote water -use efficiency and provides water education programs. Both agencies work cooperatively with Orange County retail water agencies to complete studies to assess water reliability in Orange County. These efforts are helping to enhance long-term countywide water reliability and water quality and a healthy water future for Orange County. Your local and regional water agencies are committed to making the necessary investments today in new water management projects to ensure an abundant and high -quality water supply for generations to come. Wise Water Use is Good for Us All ♦ Check your sprinkler system for leaks, overspray, and broken sprinkler heads and repair promptly. This can save countless gallons each time you water. ♦ Water plants in the early morning. It reduces evaporation and ensures deeper watering. ♦ Use a broom instead of a hose to clean off sidewalks and drive- ways. It takes very little time to sweep and the water savings quickly adds up. ♦ Soak pots and pans instead of letting water run while you scrub them clean. This both saves water and makes the job easier. Drinking Water Fluoridation Fluoride has been added to U.S. drinking water supplies since 1945. Of the 50 largest cities in the U.S., 43 fluoridate their drinking water. In December 2007, MWDSC joined a majority of the nation's public water suppliers in adding fluoride to drinking water in order to prevent tooth decay. MWDSC was in compliance with all provisions of the State's fluoridation system requirements. Our local water is not supplemented with fluoride. Fluoride levels in drinking water are limited under California state regulations at a maximum dosage of 2 parts per million. Additional information about the fluoridation of drinking water is available on these websites: U.S. Centers for Disease Control and Prevention 1 (800) 232-4636 ♦ www.cdc.gov/fluoridation/ State Water Resources Control Board, Division of Drinking Water www.waterboards.ca.gov/drinking—water/ certlic/drinkingwater/Fluoridation.html For more information about MWDSC's fluoridation program, please call Edgar G. Dymally at (213) 217-5709 or email him at edymally@mwdh2o.com. -3- Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F To Safeguard Against Issues that May Affect Your Health We Comply with All State &Federal Water Quality Regulations Basic Information About Drinking Water Contaminants The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over the surface of land or through the layers of the ground it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animal and human activity. Contaminants that may be present in source water include: ♦ Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife. ♦ Radioactive contaminants, which can be naturally occurring or be the result of oil and gas production or mining activities ♦ Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gasoline stations, urban stormwater runoff, agricultural application and septic systems. ♦ Inorganic contaminants, such as salts and metals, which can be naturally occurring or result from urban storm runoff, industrial or domestic wastewater discharges, oil and gas production, mining and farming. ♦ Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban storm - water runoff and residential uses. ♦ Compliance: In order to ensure that tap water is safe to drink, USEPA and the DDW prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. The U.S. Food and Drug Administration regulations and California law also establish limits for contaminants in bottled water that must provide the same protection for public health. Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the USEPA's Safe Drinking Water Hotline at (800) 426-4791, or online at www.epa.gov/safewater. How to Read Your Residential Water Meter Your water meter is usually located between 0 Low -Flow Indicator — The low flow indicator the sidewalk and curb under a cement cover will spin if any water is flowing through the , Remove the cover by inserting a screwdriver in the hole in the lid and then carefully lift the cover. The meter reads straight across, like the odometer on your car. Read only the white numbers (0895). If you are trying to determine if you have a leak, turn off all the water in your home, both indoor and outdoor faucets, and then check the red or black triangular dial for any movement of the low -flow indicator. If there is movement, that indicates a leak between the meter and your plumbing system. meter. © Sweep Hand — Each full revolution of the I U 8 sweep hand indicates that one cubic foot of water (7.48 gallons) has passed through 7 the meter. The markings at the outer edge of the dial indicate tenths and hundredths of one cubic foot. � � 0 0895Mr] CUBIC FEET 0 © WATER 6 METER 4 &,_. 5 A E 3 © Meter Register — The meter register is a lot like the odometer on your car. The numbers keep a running total of all the water that has passed through the meter. The register shown here indicates that 89,505 cubic feet of water has passed through this meter. -4- Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F About Lead in Tap Water If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. The City is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline at (800) 426-4791, or on the web at www.epa.gov/safewater/lead. Immunocompromised People Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno- compromised people, such as those with cancer who are undergoing chemotherapy, persons who have had organ transplants, people with HIV/AIDS or other immune system Chart Legend disorders, some elderly persons and infants can be particularly at risk to infection. These people should seek advice about drinking water from their health care providers. The USEPA and the federal Centers for Disease Control guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from USEPA's Safe Drinking Water hotline at (800) 426-4791, or on the web at www.epa.gov/safewater. Entrained Air If your tap water has a slightly "milky" appearance, you're probably experiencing an interesting but harmless phenomenon known as "entrained air." The milky color in the water caused by tiny air bubbles is harmless and is related to the operation of City wells. The air is dissolved under pressure in the groundwater, much like carbon dioxide in a bottle of soda. If your tap water is milky -colored and you want to confirm you are experiencing entrained air, rinse out a clear glass twice and then fill it with cold tap water. After a few moments, the water should begin to clear from the bottom of the glass to the top as the bubbles rise to the surface. If the water does not clear, please contact us. What are Water Quality Standards? Drinking water standards established by USEPA and DDW set limits for substances that may affect consumer health or aesthetic qualities of drinking water. The charts in this report show the following types of water quality standards: • Maximum Contaminant Level (MCL): The highest level of a contaminant that is allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. • Maximum Residual Disinfectant Level (MRDL): The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants. • Secondary MCLs: Set to protect the odor, taste, and appearance of drinking water. • Primary Drinking Water Standard: MCLs for contaminants that affect health along with their monitoring and reporting requirements and water treatment requirements. • Regulatory Action Level (AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow. How are Contaminants Measured? Water is sampled and tested throughout the year. Contaminants are measured in: • parts per million (ppm) or milligrams per liter (mg/L) • parts per billion (ppb) or micrograms per liter (pg/L) • parts per trillion (ppt) or nanograms per liter (ng/L) What is a Water Quality Goal? In addition to mandatory water quality standards, USEPA and DDW have set voluntary water quality goals for some contaminants. Water quality goals are often set at such low levels that they are not achievable in practice and are not directly measurable. Nevertheless, these goals provide useful guideposts and direction for water management practices. The charts in this report include three types of water quality goals: • Maximum Contaminant Level Goal (MCLG): The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by USEPA. • Maximum Residual Disinfectant Level Goal (MRDLG): The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants. • Public Health Goal (PHG): The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency. Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Radiologicals - Tested in 2018, 2022, and 2023 Gross Alpha Particle Activity (pCi/L) 15 (0) ND ND NO - 5 No Erosion of Natural Deposits Gross Beta Particle Activity (pCi/L) 50 (0) NR ND ND-6 No Decay of Natural and Man-made Deposits Uranium (pCi/L) 20 0.43 1.1 1 ND-3 No Erosion of Natural Deposits Inorganic Contaminants - Tested in 2022 and 2023 Aluminum (ppm) 1 0.6 NO 0.105 ND-0.07 No Treatment Process Residue, Natural Deposits Barium (ppm) 1 2 NO ND ND - 0.107 No Refinery Discharge, Erosion of Natural Deposits Bromate (ppb) 10 0.1 NR ND ND - 6.3 No Byproduct of Drinking Water Ozonation Fluoride (ppm) 2 1 0.16 NR 0.11- 0.22 No Erosion of Natural Deposits Fluoride (ppm) treatment -related 2 1 NR 0.7 0.6 - 0.8 No Water Additive for Dental Health Nitrate (ppm as N) 10 10 2.6 0.7 0.7-4.2 No Fertilizers, Septic Tanks Nitrate+Nitrite (ppm as N) 10 10 2.6 0.7 0.7-4.2 No Fertilizers, Septic Tanks Selenium (ppb) 50 30 <5 ND ND - 5.7 No Treatment Process Residue, Natural Deposits Secondary Standards* - Tested in 2022 and 2023 Aluminum (ppb) 200* 600 NO 105 ND - 70 No Treatment Process Residue, Natural Deposits Chloride (ppm) 500* n/a 132 66 33.7 - 246 No Runoff or Leaching from Natural Deposits Color (color units) 15* n/a NO 2 ND-2 No Naturally -occurring Organic Materials Odor (threshold odor number) 3* n/a NO 2 ND-2 No Naturally -occurring Organic Materials Specific Conductance (pmho/cm) 1,600* n/a 608 642 366 - 859 No Substances that Form Ions in Water Sulfate (ppm) 500* n/a 161 122 70 - 254 No Runoff or Leaching from Natural Deposits Total Dissolved Solids (ppm) 1,000* n/a 344 394 110 - 534 No Runoff or Leaching from Natural Deposits Turbidity (NTU) 5* n/a 0.16 ND ND-0.55 No Erosion of Natural Deposits Unregulated Contaminants - Tested in 2020, 2022, and 2023 Alkalinity, total as CaCO3 (ppm) Not Regulated n/a 209 84 66 - 281 n/a Runoff or Leaching from Natural Deposits Boron (ppm) NL = 1 n/a 0.11 0.13 ND - 0.2 n/a Runoff or Leaching from Natural Deposits Bromide (ppm) Not Regulated n/a 0.26 NR 0.083 - 0.68 n/a Industrial Discharge Calcium (ppm) Not Regulated n/a 113 38 25 -186 n/a Runoff or Leaching from Natural Deposits Hardness, total as CaCO3 (ppm) Not Regulated n/a 415 160 99 - 700 n/a Runoff or Leaching from Natural Deposits Hardness, total (grains/gallon) Not Regulated n/a 24 9.4 5.8-41 n/a Runoff or Leaching from Natural Deposits Magnesium (ppm) Not Regulated n/a 31.7 15 7.3 - 57.2 n/a Runoff or Leaching from Natural Deposits Manganese (ppb)** 50* n/a 1.2 ND ND - 2.5 n/a Erosion of Natural Deposits PerfluoroHexane SulfonicAcid(ppt) NIL =3 n/a <3 ND ND-4.9 n/a Industrial Discharge PerfluorohexanoicAcid (ppt) Not Regulated n/a <3 ND ND-3.3 n/a Industrial Discharge PerfluoroOctane SulfonicAcid(ppt) NIL =6.5 n/a <4 ND ND-5.4 n/a Industrial Discharge PerfluorooctanoicAcid (ppt) NL=5.1 n/a <4 ND ND-5 n/a Industrial Discharge Perfluoropentanoic Acid (ppt) Not Regulated n/a 2.8 ND ND-5.1 n/a Industrial Discharge pH (pH units) Not Regulated n/a 7.7 8.5 7.2 - 8.5 n/a Hydrogen Ion Concentration Potassium (ppm) Not Regulated n/a 2.6 3.4 1.8 - 4.3 n/a Runoff or Leaching from Natural Deposits Sodium (ppm) Not Regulated n/a 94 69 47 -129 n/a Runoff or Leaching from Natural Deposits Total Organic Carbon (ppm) TT n/a <0.3 2.4 ND-3 n/a Various Natural and Man-made Sources Total Organic Carbon (ppm)*** Not Regulated n/a 0.28 NR 0.12 - 0.6 n/a Various Natural and Man-made Sources ppb = parts -per -billion; ppm = parts -per -million; ppt = parts -per -trillion; pCi/L = picoCuries per liter; NTU = nephelometric turbidity units; pmho/cm = micromhos per centimeter; NR = Not Required to be analyzed; ND = not detected; < = average is less than the detection limit for reporting purposes; MCL = Maximum Contaminant Level; (MCLG) = federal MCL Goal; PHG = California Public Health Goal; NIL = Notification Level; RL = Response Level; n/a = not applicable; TT = treatment technique *Contaminant is regulated by a secondary standard. **Manganese is regulated with a secondary standard of 50 ppb but was not detected, based on the detection limit for purposes of reporting of 20 ppb. Manganese was included as part of the unregulated contaminants requiring monitoring. ***Total organic carbon were also included as part of the unregulated contaminants requiring monitoring. Metropolitan Water District Turbidity - combined filter effluent Treatment Turbidity TT Typical Source - 1) Highest single turbidity measurement (NTU) 0.3 0.08 No Soil run-off 2) Percentage of samples less than or equal to 0.3 NTU 95% 100% No Soil run-off Turbidity is a measure of the cloudiness of the water, an indication of particulate matter, some of which might include harmful microorganisms. Low turbidity in Metropolitan's treated water is a good indicator of effective filtration. Filtration is called a "treatment technique" (TT). A treatment technique is a required process intended to reduce the level of contaminants in drinking water that are difficult and sometimes impossible to measure directly Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Total Trihalomethanes (ppb) 80 43 ND — 62 No Byproducts of Chlorine Disinfection Haloacetic Acids (ppb) 60 16 ND-26 No Byproducts of Chlorine Disinfection Chlorine Residual (ppm) (4 / 4) 1.38 0.89-1.36 No Disinfectant Added for Treatment Aesthetic Quality Turbidity(NTU) 5* ND ND-0.25 No Erosion of Natural Deposits Eight locations in the distribution system are tested quarterly for total trihalomethanes and haloacetic acids; twenty locations are tested monthly for color, odor and turbidity. Color and odor were not detected in 2023. MRDL = Maximum Residual Disinfectant Level; MRDLG = Maximum Residual Disinfectant Level Goal *Contaminant is regulated by a secondary standard to maintain aesthetic qualities (taste, odor, color). Lead and Copper Action Levels at Residential Taps (AL) Health Goal Value Number of Sites Violation? of Contaminant Lead (ppb) 15 0.2 ND 0/53 No Corrosion of Household Plumbing Copper (ppm) 1.3 0.3 0.17 0 / 53 No Corrosion of Household Plumbing During August 2021, 53 residences were tested for lead and copper at -the -tap. Lead was detected in two samples; none exceeded the regulatory action level. Copper was detected in 38 homes; none exceeded the regulatory action level. A regulatory action level is the concentration of a contaminant which triggers treatment or other requirements that a water system must follow. Unregulated Chemicals Requiring Monitoring in the Distribution System Most Recent •- Date BromochloroaceticAcid (ppb) n/a n/a 0.58 ND-3.8 2020 Bromodichloroacetic Acid (ppb) n/a n/a ND ND-2.8 2020 ChlorodibromoaceticAcid (ppb) n/a n/a 0.26 ND-1.2 2020 Dibromoacetic Acid (ppb) n/a n/a 0.83 ND-2.1 2020 Dichloroacetic Acid (ppb) n/a MCLG=0 0.94 ND-6.1 2020 Monobromoacetic Acid (ppb) n/a n/a ND ND-0.4 2020 Trichloroacetic Acid (ppb) n/a MCLG=20 0.48 ND-4.3 2020 Source Water Assessments Imported (MWDSC) Water Assessment Every five years, MWDSC is required by DDW to examine possible sources of drinking water contamination in its State Water Project and Colorado River source waters. The most recent surveys for MWDSC's source waters are the Colorado River Watershed Sanitary Survey - 2020 Update, and the State Water Project Watershed Sanitary Survey - 2021 Update. Water from the Colorado River is considered to be most vulnerable to contamination from recreation, urban/stormwater runoff, increasing urbanization in the watershed, and wastewater. Water supplies from Northern California's State Water Project are most vulnerable to contamination from urban/stormwater runoff, wildlife, agriculture, recreation, and wastewater. USEPA also requires MWDSC to complete one Source Water Assessment (SWA) that utilizes information collected in the watershed sanitary surveys. MWDSC completed its SWA in December 2002. The SWA is used to evaluate the vulnerability of water sources to contamination and helps determine whether more protective measures are needed. A copy of the most recent summary of either Watershed Sanitary Survey or the SWA can be obtained by calling MWDSC at (800) CALL-MWD (225-5693). Groundwater Assessment An assessment of the drinking water sources for the City was completed in December 2002. The groundwater sources are considered most vulnerable to the following activities not associated with detected contaminants: confirmed leaking underground storage tanks, dry cleaners, and gas stations. The groundwater sources are considered most vulnerable to the following activities associated with contaminants detected in the water supply: known contaminant plumes, historic agricultural activities and application of fertilizers, and sewer collection systems. A copy of the complete assessment is available at State Water Resources Control Board, Division of Drinking Water, 2 MacArthur Place, Suite 150, Santa Ana, California 92707. You may request a summary of the assessment by contacting the City of Tustin Water Services at (714) 573-3178. Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F J ^ City of Tustin Water Services 1 V J 1 1 N 300 Centennial Way Tustin, California 92780 Remem6­ .connects us. PRESORT STD U.S. Postage PAID Santa Ana, CA Permit No.1208 You Can Have Confidence in the Quality of Your Water The City of Tustin Water Services is pleased to distribute this report to its water customers. It provides important information about where your water comes from and the work we perform each day to assure the water delivered to your tap meets all Federal and State drinking water standards. The tap water that comes out of your faucet has to meet rigorous State and Federal regulatory standards; otherwise, we wouldn't be able to deliver it to your home. Our annual water quality report shares details about the water you receive. You can see for yourself that we are meeting and even exceeding standards required to maintain water quality. Take a look inside for details on water sources, the constituents found in the water, and how our water compares with State and Federal standards. The City of Tustin Water Services is committed to safe- guarding its water supply and ensuring that your tap water is safe to drink. We also strive to keep you informed about the quality of your water supply. We Invite You Four r information about this report, or to Learn More water quality in general, please contact Matt Olmos at (714) 573-3383. About Your The Tustin City Council meets the first Water's Quality and third Tuesdays of every month at 7:00 pm in the City Council Chambers, 300 Centennial Way, Tustin, California. Please feel free to participate in these meetings. For more information about the health effects of the listed contaminants in the following tables, call the USEPA hotline at (800) 426-4791. Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Where Does Our Water Come From? h�P%_ OF l �P sA u — m Trinity Y o Lake C4ltFOPN�P � V REDDING • Q �•.� - v ® o e� e V c+ a„ ... and How Does It Get to Us? a� C Shasta �Lake a Lake Oroville Sacramento QpN W4TF River F l SACRAMENTO �G r Managed by the Metropolitan Water District of Southern California, the Colorado River SA Aqueduct begins near Parker Dam FRANCISC on the Colorado River. There, the Gene Pumping Station lifts the water over 300 feet as it begins its 242 mile journey to Lake Mathews, just outside the City of Corona. Along the way, the water passes through two reservoirs, five pumping stations, 62 miles of 00 canals, and 176 miles of tunnels, buried conduits and siphons. All told, the water is lifted four times, a total of more than 1,300 feet. kbu Feather River kF.isiomi Lake New Hogan The Reservoir Bay -Delta San Joaquin River Millerton Lake California Aqueduct STATE WATER PROJECT BAKERSFIELD Lake Isabella Chrisman Pumping Edmonston Plant - Pumping Plant After its journey across the Mojave N HE COL OR AD ; UCT - Pyramid Lake Desert, the water descends into the Coachella Valley and through the San Gorgonio Pass. ' Near Cabazon, the aqueduct flows underground, passing beneath P A C I F I C the San Jacinto Mountains and continuing until it reaches its OCEAN terminus at Lake Mathews. From there,156 miles of distribution lines, lob along with eight more tunnels and five drinking water treatment plants, delivers treated water throughout Southern California. Have you ever wondered where your water comes from? Here in the City of Tustin our water is drawn from local groundwater supplies then blended with water imported from both Northern California and the Colorado River. Water from Northern California travels to us through a complex delivery system known as the California State Water Project. Designed and built in the 1960s, the State Water Project is one of the largest public water and power utilities in the world, providing drinking water for more than 25 million people statewide. Managed by the California Department of Water Resources, the project stretches over 700 miles, from Lake Oroville in the north to Lake Perris in the south. Water stored in Lake Oroville, Folsom Lake, and other tributaries, and fed by snow melt from the Sierra Nevada Mountains, flows into the Sacramento and San Joaquin rivers, and from there into reservoirs in the Bay -Delta region. From the Bay -Delta, giant pumps lift the water into the 444-mile-long California Aqueduct, there to flow southward to cities and farms in Central and Southern California. Composed mainly of concrete -lined canals, the Aqueduct also includes over 20 miles of tunnels, more than 130 miles of pipelines, and 27 miles of siphons. Along the way, the water is pumped 2,882 feet over the Tehachapi Mountains. The Edmonston Pumping Plant alone lifts millions of gallons a day up 1,926 feet, the highest single water lift in the world. Is it any wonder the State Water Project is the largest single consumer of power in the /\ State of California? Silverwood Colorado Lake Aqueduct Lake Lake LOS ANGELES Lake Mathews ORANGE COUNTY SAN D EGO " 111�1 Gene Pumping Station Colorado River Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C4lD36F .; Water from State Water Project f c Reservoir -- Colorado River Aqueduct �. W Water 0 Disin - ...-:. +7� Treatment j�� Metropolitan Fail Plant Water District of Southern California WeirffD (via MWD of Orange County) (r Storage I Tank How Does Our Water Get to Us? �=? Importing water from hundreds of miles away is only the start to providing �{ you clean, fresh water. Once the water is in the southland, the Metropolitan antAna Water District of Southern California, in partnership with the Municipal Water 1 River District of Orange County, treats and pumps the water to individual cities �— throughout Orange County. The Orange County Water District, which W Waterine Groundsin . Drrtnct watr63J manages the groundwater basin beneath Central and Northern Orange County, ensures the quality and supply of groundwater throughout its service area. The City of Tustin sits atop the county aquifer and draws water from this local source, then blends it with the imported surface water. il�L. �L T `T aarr Commercial Buildin The City of Tustin Water Services vigorously works to ensure the safety of your drinking water and, in conjunction with MWDSC and OCWD, continuously monitors the water to verify adherence with drinking water regulations. Southern California has an arid climate and wise water use needs to become a part of everyone's daily lives. For as finite as our water resources are, they get smaller every year. Simple water saving acts like the ones listed here can save countless gallons of water every day. " Soak pots and pans instead of letting water run while you scrub them clean. This both saves water and makes the job easier. Keep a pitcher of drinking water in the refrigerator. This can save gallons of water every day and it's always cold! Plug the sink instead of running water to rinse your razor or wet your toothbrush. This can save upwards of 300 gallons of water a month. Use a broom instead of a hose to clean off sidewalks and driveways. It takes very little time to sweep and the water savings quickly adds up. Check your sprinkler system for leaks, overspray, and broken sprinkler heads and repair promptly. This can save countless gallons each time you water. Water plants in the early morning. It reduces evaporation and ensures deeper watering. Reservoir Beearr San Bernardino Cascading from its source high in the San Bernardino Mountains Mountains, the Santa Ana River is fed by a watershed } over Z500 square miles in area. River water is captured behind Prodo Dam and slowly released - seven to help replenish the Orange County Groundwater Dam Basin. Percolation ponds in Anaheim and Orange Wetlands h rk hold this water so it can seep into the basin. Drinking Water •_ Ocean Santa AnaRiver itSupplvwell `. k6 Orange County Groundwater Basin ;�� (Aquifer) _ �, Where Do We Use Water the Most? Outdoor watering of lawns and gardens makes up approximately 60% of home water use. By reducing your outdoor water use — by either cutting back on irrigation or planting more drought tolerant landscaping — you can dramatically reduce your overall water use. Save the most where you use the most: Make your outdoor use efficient. Showers & Baths: 8 % J Toilets: 11 % Clothes Washers: 9 % 0 Leaks: 7 % Dishwashers: 1 % Q Faucets: 6% Data is representative of average consumption; —.099l your water usage may vary. Where Can You Learn More? There's a wealth of information on the internet about Drinking Water Quality and water issues in general. Some good sites to begin your own research are: Metropolitan Water District of So. California: www.mwdh2o.com California Department of Water Resources: www.water.ca.gov The Water Education Foundation: www.watereducation.org To learn more about Water Conservation & Rebate Information: www.bewaterwise.com • www.ocwatersmart.com And to see the Aqueducts in action, checkout these two videos: Wings Over the State Water Project: youtu.be/8A1vlRr2neU Wings Over the Colorado Aqueduct: youtu.be/KipMQh5tOf4 - � N City of Tustin Water Services 300 Centennial Way • Tustin, California 92780 Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F ANNUAL WATER UALI "'Y REPORT Reporting Year 2024 I T��K-P�?kv Presented By I UJI I N City of Tustin Water Services This report contains important information Este informe contiene informacion importante about your drinking water. Translate it, or sobre so agua potable. Traducirlo, o hablar con speak with someone who understands it. alguien que to entienda. 0I � 7 A10III _l TOiI _l _F aga of 5�7H Bao cao nay chda thong tin quan trgng v6 4t:�"g osi iJo6'4o tJs Ptj'pIo oIpa tsJ p41. iJ�'Y $ of-I0i od-, CH, W'4'oH �j'I.HIg, OHLI al ntt6c u6ng cua bgn. Dich no, hoic n6i chuy@n iJei,ya y�. o'ZC . 19 Pt .iJ11 0I6H-011Tt= ANNIof 047I6HVH v6ingt16ihi6un6 Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Your 2025 Water Quality Report Since 1990, California public water utilities have been providing an annual Water Quality Report to their customers. This year's report covers drinking water quality testing and reporting for 2024. The City of Tustin Water Services Division vigilantly safeguards its water ` supply, and as in years past, the water delivered to your home meets the quality standards required by federal and state regulatory agencies. The U.S. Environmental Protection Agency (U.S. EPA) and the State Water Resources Control Board (SWRCB), Division of Drinking Water (DDW) are the agencies responsible for establishing and enforcing drinking water quality standards. ` In some cases, the City goes beyond what is required by testing for unregulated chemicals that may have known health risks but do not have drinking water standards. For example, the Orange County Water District (OCWD), which manages the groundwater basin, and the Metropolitan Water District of Southern California (MWDSC), which supplies imported, treated surface water to the City, test for unregulated chemicals in our water supply. Unregulated chemical monitoring helps U.S. EPA and DDW determine where certain chemicals occur and whether new standards need to be established for those chemicals. Through drinking water quality testing programs carried out by OCWD for groundwater, MWDSC for treated surface water, and the City for the distribution system, your drinking water is constantly monitored from source to tap for regulated and unregulated constituents. The state allows us to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of our data, though representative, is more than a year old. Sources of Supply The City's water supply is a blend of local groundwater wells and imported water connections originating from Northern California and the Colorado River by MWDSC via the Municipal Water District of Orange County (MWDOC). Groundwater comes from a natural underground aquifer that is replenished with water from the Santa Ana River, local rainfall, Groundwater Replenishment System recycled water, and imported water. The groundwater basin, which is managed by OCWD, is about 350 square miles. It lies beneath north and central Orange County from Irvine to the Los Angeles County border and from Yorba Linda to the Pacific Ocean. More than 19 cities and retail water districts draw from the basin to provide water to homes and businesses. Drinking Water Contaminants Groundwater Assessment n assessment of the drinking water sources for the City was 1-1completed in December 2002. The groundwater sources are considered most vulnerable to the following activities not associated with detected contaminants: confirmed leaking underground storage tanks, dry cleaners, and gas stations. The groundwater sources are considered most vulnerable to the following activities associated with contaminants detected in the water supply: known contaminant plumes, historic agricultural activities and application of fertilizers, and sewer collection systems. A copy of the complete assessment is available at State Water Resources Control Board, Division of Drinking Water, 2 MacArthur Place, Suite 150, Santa Ana, CA 92707. You may request a summary of the assessment by contacting the City of Tustin Water Services at (714) 573-3178. The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material and can pick up substances resulting from the presence of animals or from human activity. Contaminants that may be present in source water include: • Microbial contaminants, such as viruses and bacteria, that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. • Inorganic contaminants, such as salts and metals, that can be naturally occurring or result from urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming. • Pesticides and herbicides that may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses. • Organic chemical contaminants, including synthetic and volatile organic chemicals, that are by-products of industrial processes and petroleum production and can also come from gas stations, urban stormwater runoff, agricultural application, and septic systems. • Radioactive contaminants that can be naturally occurring or the result of oil and gas production and mining activities. To ensure that tap water is safe to drink, the U.S. EPA and the SWRCB prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. U.S. Food and Drug Administration regulations and California law also establish limits for contaminants in bottled water that provide the same protection for public health. Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the U.S. EPA's Safe Drinking Water Hotline (1-800-426-4791). Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41 D36F Quality Water is Our Priority Orange County's Water Future Turn the tap and the water flows, as if • by magic. Or so it seems. The real- ity is considerably different. Delivering high -quality drinking water to our cus- tomers is a scientific and engineering feat that requires considerable effort and talent to ensure the water is always there, always safe to drink. Because tap water is highly regulated by state and federal laws, water treatment and distribution operators must be licensed. Our licensed water professionals have an understanding of a wide range of subjects, including mathematics, biology, chemistry, physics, and engineering. Some of the tasks they complete on a regular basis include: • Operating and maintaining equipment to purify and clarify water; • Monitoring and inspecting machinery, meters, gauges, and operating conditions; • Conducting tests and inspections on water and evaluating the results; • Documenting and reporting test results and system operations to regulatory agencies; and • Serving our community through customer support, education, and outreach. So the next time you turn on your faucet, think of the skilled professionals who stand behind every drop. You Can Have Confidence in the Quality of Your Water The City of Tustin Water Services is pleased to distribute this report to its water customers. It provides important information about where your water comes from and the work we perform each day to ensure the water delivered to your tap meets all federal and state drinking water standards. Our annual water quality report shares details about the water you receive. You can see for yourself that we are meeting or even exceeding standards required to maintain water quality. Take a look inside for details on water sources, the constituents found in the water, and how our water compares with state and federal standards. The City of Tustin Water Services is committed to safeguarding its water supply and ensuring that your tap water is safe to drink. We also strive to keep you informed about the quality of your water supply. We Invite You to Learn More About Your Water's Quality For information about this report, or your water quality in general, please contact Matt Olmos at (714) 573-3383. The Tustin City Council meets the first and third Tuesday of every month at 7:00 p.m. in City Council Chambers, 300 Centennial Way. Please feel free to participate in these meetings. For years, Orange County has benefited from an abundant, high -quality water supply. As statewide water demand increases, it is essential to use this precious natural resource efficiently and invest in long-term water sustainability. The OCWD and MWDOC work collaboratively to develop and implement innovative water management and supply programs, including: • Water reuse and recycling • Wetlands expansion and recharge facility construction • Groundwater cleanup projects • Ocean and brackish water desalination • Surface water storage and stormwater capture • Water -use efficiency programs and incentives These initiatives are enhancing countywide water reliability and water quality while ensuring a sustainable water future for generations to come. Commitment to Water Sustainability Your local and regional water agencies are making necessary investments today to develop new water supplies, protect existing resources, and improve water quality. For more information on water conservation, projects, and sustainability efforts, visit: • Orange County Water District: ocwd.com • Municipal Water District of Orange County: mwdoc.com Together, we can ensure an abundant and reliable water supply for Orange County's future. Important Health Information Some people may be more vulner- able to contaminants in drinking water than the general population. Immunocompromised persons such as persons with cancer undergoing che- motherapy, persons who have under- ®rl"111f gone organ transplants, people with HIV/AIDS or other immune sys- tem disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drink- ing water from their health-care providers. U.S. EPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infec- tion by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (1-800- 426-4791). Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961 OC41 D36F Water Conservation: Making Every Drop Count Water is a limited natural resource, and using it effi- ciently is essential in both wet and dry years. Outdoor watering makes up about 60 percent of hom( water use, making it the bigger opportunity for savings. Start Outdoors: Use Water Wisely in Your Yard • Choose water -wise plants and drought -tolerant landscaping. • Adjust sprinklers to avoid watering sidewalks and streets. • Water in the early morning or late evening to reduce evaporation. • Fix leaks in irrigation systems —a small leak can waste thousands of gallons per year. • Use mulch to retain moisture and keep plants healthy. • Visit bewaterwise.com for more landscaping ideas and rebates. Indoor Water -Saving Tips • Take shorter showers —a five-minute shower uses much less water than a bath. • Turn off the tap while brushing your teeth, shaving, or washing dishes. • Fix leaks —a dripping faucet or running toilet can waste thousands of gallons per year. • Run dishwashers and washing machines only when full to save up to 1,000 gallons per month. • Keep a pitcher of drinking water in the refrigerator to avoid running the tap for cold water.= Why Conservation Matters Southern Californias and climate and reliance on imported water make conservation essential. Water is transported hundreds of miles through aqueducts from the Colorado River and Northern California, with high costs for pumping and treatment. Small Actions, Big Impact By making small changes in daily habits and using water more efficiently, we can protect this vital resource for future generations. For more tips, rebates, and programs, visit: • ocwatersmart.com • bewaterwise.com City of Tustin Water Services 300 Centennial Way, Tustin, CA 92780 • (714) 573-3350 tustinca.org/215/Water-Operations • molmos@tustinca.org About Lead in Tap Water Lead can cause serious health effects in people of all ages, especially pregnant people, infants (both formula -fed and breastfed), and young children. Lead in drinking water is primarily from materials and parts used in service lines and home plumbing. City of Tustin Water Services is responsible for providing high -quality drinking water and removing lead pipes but cannot control the variety of materials used in the plumbing in your home. Because lead levels may vary over time, lead exposure is possible even when your tap sampling results do not detect lead at one point in time. You can help protect yourself and your family by identifying and remov- ing lead materials within your home plumbing and taking steps to reduce your family's risk. Using a filter certified by an American National Standards Institute —accredited certifier to reduce lead is effective in reducing lead exposures. Follow the instructions provided with the filter to ensure it is used prop- erly. Use only cold water for drinking, cooking, and making baby formula. Boiling does not remove lead from water. Before using tap water for drinking, cooking, or making baby formula, flush your pipes for several minutes. You can do this by running your tap, taking a shower, or doing laundry or a load of dishes. If you have a lead or galvanized service line requiring replacement, you may need to flush your pipes for a longer period. If you are concerned about lead and wish to have your water tested, contact City of Tustin Water Services at (714) 573-3350. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available at epa.gov/safewater/lead. Lead Service Line Inventory he City of Tustin has completed the lead service line initial inventory (LSLI) required by U.S. EPNs Lead and Copper Rule Revisions. The deadline for the LSLI was October 16, 2024. Through completing a historical records review and field investigations, the City of Tustin has determined that while all service lines within the distribution system are lead- free, 130 customer -side service lines have been identified as galvanized requiring replacement. This includes all customer - owned service lines. For more information, please visit tustinca.org/l534/Lead-and-Copper-Rule-Revisions. Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F961OC41D36F 2024 City of Tustin Drinking Water Quality For more information about the health effects of the contaminants listed in the following tables, call the U.S. EPA hotline at (800) 426-4791. i Total Trihalomethanes (ppb) 80 38 ND - 33 No Byproducts of Chlorine Disinfection Haloacetic Acids (ppb) 60 14 ND - 9.8 No Byproducts of Chlorine Disinfection Chlorine Residual (ppm) (4 / 4) 1.17 0.69 - 1.5 No Disinfectant Added for Treatment Aesthetic Quality Color (color units) 15* ND ND-5 No Erosion of Natural Deposits Turbidity (ntu) 5* 0.12 ND - 0.42 No Erosion of Natural Deposits Eight locations in the distribution system are tested quarterly for total trihalomethanes and haloacetic acids; twenty locations are tested monthly for color, odor and turbidity. Odor was not detected in 2024. MRDL = Maximum Residual Disinfectant Level; MRDLG = Maximum Residual Disinfectant Level Goal; *Contaminant is regulated by a secondary standard to maintain aesthetic qualities (taste, odor, color). During July 2024, 48 residences were tested for lead and copper at -the -tap. Lead was detected in two homes; none exceeded the regulatory action level. Copper was detected in 37 homes; none exceeded the regulatory action level. A regulatory action level is the concentration of a contaminant which triggers treatment or other requirements that a water system must follow. Bromochloroacetic Acid (ppb) n/a n/a 0.35 I ND - 3.5 I 2020 Bromodichloroacetic Acid (ppb) n/a n/a ND I ND - 2.8 I 2020 Chlorodibromoacetic Acid (ppb) I n/a I n/a I ND I ND - 1.2 I 2020 Dibromoacetic Acid (ppb) I n/a n/a I 0.9 I ND - 1.7 I 2020 Dichloroacetic Acid (ppb) n/a MCLG = 0 I 0.44 ND - 6.1 I 2020 Trichloroacetic Acid (ppb) n/a MCLG = 20 ND ND - 4.3 2020 Source Water Assessment Imported (MWDSC) Water Assessment Every five years, MWDSC is required by DDW to examine possible sources of drinking water contamination in its State Water Project and Colorado River source waters. The most recent surveys for MWDSC's source waters are the Colorado River Watershed Sanitary Survey-2020 Update and the State Water Project Watershed Sanitary Survey-2021 Update. Water from the Colorado River is considered to be most vulnerable to contamination from recreation, urban/stormwater runoff, increasing urbanization in the watershed, and wastewater. Water supplies from Northern California's State Water Project are most vulnerable to contamination from urban/stormwater runoff, wildlife, agriculture, recreation, and wastewater. U.S. EPA also requires MWDSC to complete a source water assessment (SWA) that uses information collected in the watershed sanitary surveys. MWDSC completed its SWA in December 2002. The SWA is used to evaluate the vulnerability of water sources to contamination and helps determine whether more protective measures are needed. A copy of the most recent summary of the Watershed Sanitary Surveys or the SWA can be obtained by calling MWDSC at (800) CALL-MWD (800-225-5693). Groundwater Assessment The City's water supply also includes local treated groundwater from East Orange County Water District (EOCWD). An assessment of the drinking water sources for EOCWD was completed in December 2002. The groundwater sources are considered most vulnerable to the following activities associated with nitrates detected in the water supply: historic waste dumps/landfills, and past agricultural activities and application of fertilizers. The groundwater sources are considered most vulnerable to the following activities not associated with detected contaminants: dry cleaners and gas stations. A copy of the complete assessment is available at State Water Resources Control Board, Division of Drinking Water, 2 MacArthur Place, Suite 150, Santa Ana CA 92707. You may request a summary of the assessment by contacting Jerry Mendzer at EOCWD, (714) 538-5815. Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Radiologicals - Tested in 2022, 2023, and 2024 Gross Alpha Particle 15 Activity (pCi/L) Gross Beta Particle 50 Activity (pCi/L) Radium, Combined 5 (pCi/L) Uranium (pCi/L) 20 ' Inorganic Contaminants - Tested in 2023 and 2024 Aluminum (ppm) 1 Barium (ppm) 1 Bromate (ppb) 10 Fluoride (ppm) 2 Fluoride (ppm) 2 treatment -related Hexavalent 10 Chromium (ppb) Nitrate (ppm as N) I 10 Nitrate+Nitrite (ppm 10 as N) Perchlorate (ppb) 6 Selenium (ppb) 50 Secondary Standards* - Tested in 2023 and 2024 Aluminum (ppb) 200* Chloride (ppm) 500* Color (color units) 15* Odor (threshold odor 3* number) Specific Conductance 1,600* (pmho/cm) Sulfate (ppm) 500* Total Dissolved 1,000* Solids (ppm) Turbidity (ntu) 5* (0) (0) (0) 0.43 0.6 2 0.1 1 1 0.02 10 10 30 ND I ND I ND I ND-5 No NR NR 4 ND-5 No ND ND ND ND - 1.4 No 1.1 1.1 1 ND-3 No a It ND ND ND ND ND 0.124 NR NR ND 0.16 0.16 NR NR NR 0.7 0.26 0.38 ND 2.4 I 3.3 I ND 2.4 3.3 ND ND ND ND ND ND ND 600 ND ND ND n/a 131 99 104 n/a ND ND 2 n/a ND ND 1 n/a 996 892 979 n/a 161 119 224 n/a 330 564 621 n/a ND ND ND ND - 0.11 ND - 0.124 ND - 1.6 0.11 - 0.22 0.6 - 0.8 N D - 0.55 ND-4 ND-4 ND-1.4 ND - 5.7 ND - 110 34 - 246 ND-2 ND-1 562 - 1,640 79 - 254 120 - 686 N D - 0.45 No No No No No No No No No No No No No No No No No No - _ � Q M1Vow K Erosion of Natural Deposits Decay of Natural and Man-made Deposits Erosion of Natural Deposits Erosion of Natural Deposits Treatment Process Residue, Natural Deposits Refinery Discharge, Erosion of Natural Deposits Byproduct of Drinking Water Ozonation Erosion of Natural Deposits Water Additive for Dental Health Erosion of Natural Deposits; Industrial Discharge Fertilizers, Septic Tanks Fertilizers, Septic Tanks Industrial Discharge Treatment Process Residue, Natural Deposits Treatment Process Residue, Natural Deposits Runoff or Leaching from Natural Deposits Naturally -occurring Organic Materials Naturally -occurring Organic Materials Substances that Form Ions in Water Runoff or Leaching from Natural Deposits Runoff or Leaching from Natural Deposits Erosion of Natural Deposits Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Alkalinity, total as Y Not Regulated n/a 9 208 183 114 105 - 281 n/a Runoff or Leaching from Natural 9 CaCO3 (ppm) Deposits Boron (ppm) NL = 1 n/a 0.14 0.13 0.14 ND - 0.2 n/a Runoff or Leaching from Natural Deposits Bromide (ppm) (1) Not Regulated n/a I 0.27 I 0.17 NR 0.087 - 0.68 n/a Industrial Discharge Calcium (ppm) Not Regulated n/a 107 95 68 41 - 186 n/a Runoff or Leaching from Natural Deposits Hardness, total as Not Regulated n/a 392 327 270 133 - 700 n/a Runoff or Leaching from Natural CaCO3 (ppm) Deposits Hardness, total (grains/ Not Regulated n/a 23 19 16 8 - 41 n/a Runoff or Leaching from Natural gallon) Deposits Lithium (ppb) (2) Not Regulated n/a 4.8 NR 22 ND - 38 n/a Various Natural and Man-made Sources Magnesium (ppm) Not Regulated n/a 30.3 22 26 7.3 - 57.2 n/a Runoff or Leaching from Natural Deposits Manganese (ppb) (1) (3) 50* n/a I 1.1 I NR ND ND - 2.2 n/a Erosion of Natural Deposits Perfluorobutanoic Acid Not Regulated n/a ND ND ND ND - 9 n/a Industrial Discharge (ppt) Perfluoro Hexane NL = 3 n/a ND ND ND ND-3 n/a Industrial Discharge Sulfonic Acid (ppt) Perfluoro Hexane NL = 3 n/a ND ND ND ND - 3.2 n/a Industrial Discharge Sulfonic Acid (ppt) (2) Perfluorohexanoic Acid Not Regulated n/a ND ND ND ND - 4.4 n/a Industrial Discharge (pPt) Perfluoropentanoic Not Regulated n/a ND ND ND ND - 5.9 n/a Industrial Discharge Acid (ppt) PH (pH unit) Not Regulated n/a I 8 I 7.9 I 8.2 I 7.2 - 8.2 n/a Hydrogen Ion Concentration Potassium (ppm) Not Regulated n/a 2.6 2.2 4.9 1.8 - 5.4 n/a Runoff or Leaching from Natural Deposits Sodium (ppm) Not Regulated n/a 97.3 65 103 I 64 - 129 n/a Runoff or Leaching from Natural Deposits Total Organic Carbon TT n/a ND ND 2.4 ND - 2.5 n/a Various Natural and Man-made (ppm) Sources Total Organic Carbon 9 Not Regulated n/a 9 0.32 NR NR 0.14 - 0.6 n/a Various Natural and Man-made (ppm) (1) Sources ppb = parts -per -billion; ppm = parts -per -million; ppt = parts -per -trillion; pCi/L = picoCuries per liter; ntu = nephelometric turbidity units; pmho/cm = micromhos per centimeter; NR = Not Required to be analyzed; ND = not detected; MCL = Maximum Contaminant Level; (MCLG) = federal MCL Goal; PHG = California Public Health Goal; NL = Notification Level; n/a = not applicable; TT = treatment technique * Contaminant is regulated by a secondary standard. (1) Contaminant included as part of the Fourth Unregulated Contaminant Monitoring Rule (UCMR 4). (2) Contaminant included as part of the Fifth Unregulated Contaminant Monitoring Rule (UCMR 51. (3) Manganese is regulated with a secondary standard of 50 ppb but was not detected, based on the detection limit for purposes of reporting of 20 ppb. Turbidity - combined filter effluent 1) Highest single turbidity measurement (NTU) 0.3 0.06 No Soil Runoff 2) Percentage of samples less than or equal to 0.3 NTU 95% 100% I No I Soil Runoff Turbidity is a measure of the cloudiness of the water, an indication of particulate matter, some of which might include harmful microorganisms. Low turbidity in Metropolitan's treated water is a good indicator of effective filtration. Filtration is called a "treatment technique" (TT). A treatment technique is a required process intended to reduce the level of chemicals in drinking water that are difficult and sometimes impossible to measure directly. NTU = nephelometric turbidity units Docusign Envelope ID: 38064E8A-4F76-44FF-82D5-F9610C41D36F Drinking Water Definitions What are water quality standards? Drinking water standards established by U.S. EPA and DDW set limits for substances that may affect consumer health or aesthetic qualities of drinking water. The tables in this report show the following types of water quality standards: • Maximum contaminant level (MCQ: The highest level of a contaminant that is allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. • Maximum residual disinfectant level (MRDL): The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants. • Secondary MCU are set to protect the odor, taste, and appearance of drinking water. • Primary drinking water standard (PDWS): MCLs for contaminants that affect health, along with their monitoring and reporting requirements and water treatment requirements. • Regulatory action level (AL): The concentration of a contaminant that, if exceeded, triggers treatment or other requirements that a water system must follow. What is a water quality goal? In addition to mandatory water quality standards, U.S. EPA Cross Connections he SWRCB updated the Cross -Connection Control Policy Handbook (CCCPH) on July 1, 2024. More information about the City of Tustin's Cross -Connection Control (CCC) Plan will be available at tustinca.org/215/Water-Operations. Where Can You Learn More? There's a wealth of information on the internet about drinking water quality and water issues in general. Some good sites to begin your research are: • Metropolitan Water District of Southern California: mwdh2o.com • California Department of Water Resources: water.ca.gov • The Water Education Foundation: watereducation.org To learn more about water conservation and rebate information: • bewaterwise.com • ocwatersmart.com And to see the aqueducts in action, check out these two videos: • Wings Over Water: youtu.be/8A1v1Rr2neU • Wings Over Metropolitan's Colorado River Aqueduct: youtu.be/KipMQh5t0f4 and DDW have set voluntary water quality goals for some contaminants. Water quality goals are often set at such low levels that they are not achievable in practice and are not directly measurable. Nevertheless, these goals provide useful guideposts and direction for water management practices. The tables in this report include three types of water quality goals: • Maximum contaminant level goal (MCLG): The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by U.S. EPA. • Maximum residual disinfectant level goal (MRDLG): The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants. • Public health goal (PHG): The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California EPA. How are contaminants measured? Water is sampled and tested throughout the year. Contaminants are measured in: • Parts per million (ppm) or milligrams per liter (mg/L) • Parts per billion (ppb) or micrograms per liter (µg/L) • Parts per trillion (ppt) or nanograms per liter (ng/L)