Water Quality Report
To comply with the Federal Safe Drinking Water Act, which requires water utilities to provide annual "consumer confidence" reports to their customers, the city prepares the annual Water Quality Report.(PDF, 7MB)
The report contains information on where Renton's drinking water originates; what minerals or chemicals it contains; how it compares to stringent water quality standards; what Renton is doing to protect the water supply, as well as what the city is doing to wisely use and conserve regional water supply. Providing high-quality and safe drinking water is one of Renton's highest priorities. Water from the City of Renton and Seattle Public Utilities meets all regulatory standards, ensuring that your water is safe to drink.
For a printed copy of the report, reach out to Lauren Imhoff, LImhoff@Rentonwa.gov.
2026 Drinking Water Quality Report
Providing safe, high-quality drinking water
This report is prepared annually by the City of Renton Public Works Department to share important water-related information with customers. Inside this report, you will find water quality data, where our water comes from, our water treatment process, and helpful water conservation tips.
Providing safe, high-quality drinking water is one of Renton’s highest priorities. This is the City of Renton’s 2026 Consumer Confidence Report which reports the water quality information collected in 2025. In 2025 Renton had no violations and all water quality testing was compliant with strict water standards. For a translation of this report, please visit rentonwa.gov/waterquality and select a language at the top of the page. If you would like a paper copy of this report, please email limhoff@rentonwa.gov or call 425-430-7287.
Renton’s Water Sources
The City of Renton had four sources for drinking water in 2025
- Downtown Wellfield: Six wells located in Liberty and Cedar River Parks that draw water from the Cedar Valley Aquifer.
- Springbrook Springs: A small spring in south Renton.
- Maplewood Wellfield: Wells located below the Maplewood Golf Course.
Seattle Public Utilities: An agreement to buy water from Seattle Public Utilities (SPU), sourced from the protected Cedar and Tolt Municipal Watersheds. Our agreement with SPU began in January 2012. During 2025, SPU provided approximately 38 million gallons of water. Water is purchased from SPU primarily for the Renton Boeing plant and as a backup supply during summer peak use periods. More information is available at SPU: seattle.gov/utilities/about/reports/water-quality.
2025 Renton Water Quality Results
Downtown Wells, Springbrook Springs, and Maplewood Wellfield sampled at the source after treatment
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Water additive to prevent tooth decay
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Fertilizer runoff; leaching from septic tanks; erosion of natural deposits
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Erosion of natural deposits; water treatment
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Runoff or leaching from firefighting
foam, industrial discharge, and
landfills; wastewater treatment plants
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*The water quality information presented is from the most recent testing within the last five years.
** Per- and polyfluoroalkyl substances, also known as PFAS, are a new class of contaminants for which testing is now required. In 2025, Renton performed quarterly monitoring for PFAS. Sampling occurred at each source. Other than PFOA and PFBS, other PFAS were not detected in the initial quarterly monitoring. PFBS does not currently have a federal MCL. EPA regulates PFBS as part of a PFAS Hazard Index that includes several PFAS compounds.
Note: water quality results for the first two tables show 1) Highest or Average Amount and 2) Range, which is the lowest and highest result of testing for the substance.
Sampling Points in the Water Distribution System
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Additive to control microbes
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*** In 2024, Renton changed to quarterly monitoring for total trihalomethanes and haloacetic acids. Sampling occurs at two sites per quarter. The reported highest LRAA was calculated for all four quarters of the year.
Residential Water Taps
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Homes Exceeding Action Level
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Lead service lines; corrosion of household plumbing including fittings and fixtures; erosion of natural deposits
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Corrosion of household plumbing systems; erosion of natural deposits
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- Beginning in April 2016, Renton lowered the fluoride level to 0.7 ppm, which is the level recommended by the Washington State Department of Health. Renton citizens voted to add fluoride to the drinking water in 1985. Renton Water Treatment Operators also measure fluoride levels in the field daily.
- The EPA recommends 20 ppm as a level of concern for people on a sodium-restricted diet. Renton adds sodium hydroxide to prevent corrosion of plumbing. Sodium hypochlorite is added to water from the Maplewood wells for disinfection and to remove naturally-occurring ammonia.
- There were 53 samples tested for lead and copper. All of the samples tested had levels far below the Action Levels for both lead and copper.
2025 SPU Water Quality Results
Since 2012, the city has purchased water from Seattle Public Utilities (SPU) to serve the Renton Boeing plant and as a backup supply during summer peak use periods. Results of the 2025 water quality monitoring requirements performed by SPU for the Cedar River and Tolt River sources are shown below.
Seattle Public Utilities Water Quality Results
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Total Organic Carbon (ppm)
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Naturally present in the environment
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Erosion of natural deposits
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Erosion of natural deposits
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Water additive to prevent tooth decay
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Definitions
90th Percentile: i.e. 90 percent of the samples were less than the values shown.
Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.
LRAA: Locational Running Annual Average – The average of analytical results for samples taken at a particular monitoring location during the previous four calendar quarters.
MCL: Maximum Contaminant Level – The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
MCLG: Maximum Contaminant Level Goal – The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
MRDL: Maximum Residual Disinfectant Level – 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.
MRDLG: Maximum Residual Disinfectant Level
Goal: 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.
NTU: Nephelometric Turbidity Unit – Turbidity is a measure of how clear the water looks. The turbidity MCL that applied to the Cedar supply in 2025 is 5 NTU, and for the Tolt supply it was 0.3 NTU for at least 95% of the samples in a month. 100% of Tolt samples in 2025 were below 0.3 NTU.
ppm: 1 part per million = 1 mg/L = 1 milligram per liter. One part per million is equivalent to ¼ of a dissolved aspirin tablet in a full bathtub of water (approximately 50 gallons of water).
ppb: 1 part per billion = 1 µg/L = 1 microgram per liter. 1 ppm = 1000 ppb. One part per billion is equivalent to ¼ of a dissolved aspirin tablet in 1,000 full bathtubs of water (approximately 50,000 gallons of water).
ppt: 1 part per trillion = 1 ng/L = 1 nanogram per liter. 1 ppm = 1,000,000 ppt. One part per trillion is equivalent to 1 drop of water in 20 Olympic-sized swimming pools (approximately 13,200,000 gallons of water).
SAL: State Action Level – The concentration of a contaminant established to protect public health prior to the establishment of an MCL, which required public notification within 30 days of learning of an exceedance.
TT: Treatment Technique – A required process intended to reduce the level of a contaminant in drinking water.
Water Treatment
Downtown Wellfield and Springbrook Springs:
The water pumped from the downtown wells and Springbrook Springs is naturally very clean and needs minimal treatment. To make sure the water is safe for drinking the city:
- Adds chlorine to destroy bacteria, parasites, and viruses that could possibly enter our source water. Chlorine also protects water in the distribution system in case there is a contamination event like a water main break or backflow incident.
- Adds sodium hydroxide to slightly raise the pH of the water to help prevent the corrosion of household plumbing.
- Adds fluoride to prevent tooth decay, as voted on and approved by Renton voters in 1985.
- In the West Hill neighborhood, ortho-polyphosphates are added to reduce the internal corrosion of old cast iron water mains.
Maplewood Wellfield:
Due to naturally occurring minerals, Maplewood’s water must first be treated before it is pumped into the distribution system. The city:
- Removes manganese, hydrogen sulfide, and ammonia.
- Adds chlorine as a secondary disinfectant to protect the water quality in the distribution system.
- Adds fluoride to prevent tooth decay.
Note: The city purchased 1.3% of its total amount of water sold in 2025 from SPU. This water serves the Boeing Renton Plant and is a backup supply to Renton customers.
Water Consumption and Losses
Renton’s total water produced and purchased in 2025 was 3,006,445,501 gallons. The authorized water consumption from this amount was 2,517,616,866. Distribution System Leakage (DSL) is calculated from these two numbers and reported in the Water Use Efficiency report to the Washington State Department of Health (DOH) as a three year rolling average, calculated to be 15.4%. Renton’s DSL for the 2025 calendar year was 16.3%, or 488,828,635 gallons. This is a 0.8% increase from 2024’s DSL of 15.5%. Our three-year rolling average increased by 0.22%.
DSL reflects the amount of water and potential revenue that has been lost due to unauthorized water use, water main breaks and leaks, functional issues, and other causes. The city is continuing to monitor the water system and looking at various ways to reduce water loss.
Water Loss Control Action Plan
Since the three-year (2023–2025) annual average of the city’s DSL exceeds 10%, the city is required by the state to develop and implement a Water Loss Control Action Plan. The city is taking the following actions, among others, to identify and reduce water loss in the distribution system:
- Continue the annual replacement of aging and leaky water mains.
- Conduct leak testing on old underground water reservoirs and repair leaky joints on concrete floors and walls.
- Continue using Advanced Metering Infrastructure (AMI) technology to detect leaks and testing of water meters.
Water Use Efficiency
In 2021, Renton hosted a public forum and updated the Water Use Efficiency (WUE) goals as part of the Water System Plan Update. The city has the following measurable WUE goals:
- Reduce Distribution System Leakage (DSL) to 10 percent or less by 2022
- Limit the Maximum Daily Demand to Average Daily Demand peaking factor to less than 2.0
- Maintain an ERU value under 160 gpd/ERU (gallons per day/Equivalent Residential Unit)
As part of the Saving Water Partnership (SWP), the city also supports the regional 2019–2028 WUE goal to keep the total average annual retail water use of SWP members under 110 million gallons per day (mgd) through 2028 despite forecasted population growth by reducing per capita water use. See page 19 to learn more about the SWP.
The City of Renton reports it’s WUE information because in 2003 in the Washington State Legislature passed the Municipal Water Law to address the increasing demand on the state’s water resources. The law established that all municipal water suppliers must use water more efficiently in exchange for water right certainty and flexibility to help them meet future demand. The WUE Rule is part of this law and requires municipal water suppliers to report their goals and progress each year.
2025 Renton Water Statistics
- 2,968,526,000 gallons produced by the City of Renton from nine wells and one spring
- 319 miles of water main in service
- 17,960 total metered connections
- 8,132,948 gallons produced on an average day
- 13,352,000 gallons produced on high-demand day: August 10, 2025
- 5,377,000 gallons produced on low-demand day: November 14, 2025
Water Hardness
Renton’s water falls within the slightly hard, moderately hard, and hard range, depending upon the customer’s water source within the city. The most recent water hardness testing showed 48 ppm for the downtown wells, 69 ppm for Maplewood, and 125 ppm for Springbrook Springs. A water’s hardness is dependent upon the levels of two naturally occurring soluble minerals—calcium and magnesium. Hard water may cause scale buildup in cooking pans, sinks, and water heaters, and may require using more soap to form a lather. If you do not know which water source your drinking water comes from, the water utility can help. Please find the contact information on the last page of this report.
Water Hardness Scale
Residential Water Quality for Brewers
For brewers in our community, specific water quality parameters are often of interest. Below are the values for the minerals and parameters generally requested. These numbers are the annual range of values. Renton’s water comes from multiple sources and depending upon your location, you may receive water from one source or a combination of our water sources.
Residential Water Quality for Brewers
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Water Source Downtown Wells
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Total hardness as Calcium Carbonate
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Historical Data
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Water Source Downtown Wells
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Fluoride
In 1985, the citizens of Renton voted to have fluoride added to the city’s drinking water. Fluoride levels were adjusted in 2016 to meet the DOH’s new recommended level of 0.7 ppm. More information on fluoride can be found at the CDC at cdc.gov/fluoridation/faqs.
PFAS
PFAS is an acronym for “per- and poly-fluorinated alkyl substances.” PFAS are synthetic chemicals used in many consumer products, including food wrappers, fabrics, and carpets, to make them resistant to water, oil, grease, stains, and heat. Certain types of firefighting foam may contain PFAS. Even though PFAS compounds aren’t manufactured in Washington State, there are known cases of PFAS contamination in drinking water linked to the use of firefighting foam by the U.S. military, local fire departments, and airports.
PFAS Rule and Testing
In 2024 and 2025, federal and state regulators made important updates about how certain PFAS chemicals are assessed and regulated in drinking water. These updates affect how PFAS results are reported and how public health protections are applied. In April 2024, the U.S. Environmental Protection Agency (EPA) established the first national drinking water standards for several PFAS, which will become enforceable in April 2029.
Until then, Washington State’s State Action Levels (SALs) guide PFAS testing, reporting, and customer notification. SALs and federal standards are both health-based values—SALs provide early information and protection now, while federal standards will apply in the future.
Testing last year identified PFAS detections in two of our water sources at levels below both Washington SALs and applicable federal standards. These results are summarized in the data tables at the front of this report. Detections below the SALs meet current drinking water standards and do not represent a regulatory violation.
- You’re getting more protection sooner. SALs help alert customers now, even before federal MCLs are fully in effect.
- Federal standards will provide enforceable nationwide limits beginning in 2029.
- Renton will continue to monitor and report PFAS to track trends and protect public health.
One of the challenges of providing health guidance for PFAS is that these chemicals are still being researched. Health advice is updated as new science becomes available. The City of Renton will continue monitoring for PFAS and stay current with state and federal regulations to ensure our customers receive accurate, science-based information about their drinking water.
To ensure that tap water is safe to drink, the Department of Health and EPA prescribe regulations that limit the amount of certain contaminants in water provided by public water systems. The Food and Drug Administration (FDA) and the Washington Department of Agriculture regulations establish limits for contaminants in bottled water that must provide the same protection for public health.
Our drinking water comes from wells and springs. As our water travels through the ground to the wells, it can dissolve naturally occurring minerals as well as substances from human activity. 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 EPA’s Safe Drinking Water Hotline (1-800-426-4791).
Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (1-800-426-4791).
Information on Lead in Drinking Water
Renton works to prevent the corrosion of lead as well as other metals such as copper and iron. To do this, Renton adjusts the pH of the distributed water to prevent the corrosion of household plumbing, which is the major potential source of lead. In areas of the city with cast iron water mains, such as West Hill, ortho-polyphosphates are added to prevent corrosion. To make sure this treatment is working, water is periodically tested at residential taps, with our most recent copper and lead testing done in 2025. See the Water Quality Table on page 6 for this data. This testing is in compliance with the Lead and Copper Rule. More information is available at doh.wa.gov/leadandcopperrule.
Where does lead in drinking water come from?
In Washington State, lead in drinking water comes primarily from materials and components used in household plumbing. The more time water has been sitting in pipes, the more dissolved metals, such as lead, it may contain. Elevated levels of lead can cause serious health problems, especially in pregnant women and young children.
To help reduce potential exposure to lead, for any drinking water tap that has not been used for six hours or more, flush water through the tap until the water is noticeably colder before using for drinking or cooking. You can use the flushed water for watering plants, washing dishes, or general cleaning. Only use water from the cold-water tap for drinking, cooking, and especially for making baby formula. Hot water is likely to contain higher levels of lead.
Homes built before 1986 are more likely to have lead pipes, fixtures, and solder. The most common problem is brass or chrome-plated brass faucets and fixtures that can leach lead into the water, especially hot water. As of January 1, 2014, all newly installed water faucets, fixtures, pipes, and fittings must meet new lead-free requirements, which reduce the amount of lead allowed to 0.25%. However, these requirements do not apply to existing fixtures, such as those found in many older homes.
Lead Testing in Schools
The Washington State Department of Health has developed a program to address concerns about lead in school drinking water. For updated information, please visit: doh.wa.gov/LeadinSchoolDrinkingWater.
Water Utility Spotlight
Highlands Transmission Mains
The Highlands Reservoir Water Main Improvements project includes installation of two new water mains along NE 12th Street, from Edmonds Avenue NE to Queen Avenue NE. The new Pressure Zone 435 transmission main will be installed and configured to accommodate the geometrya new 6.3 million gallon reservoir. The new Pressure Zone 565 distribution main will be designed to support increased demands from recent apartment and condominium developments (including Solera), as well as future growth within the pressure zone. These water main improvements are critical to maintaining long-term system reliability and water quality. Construction is anticipated to begin in early summer 2026 and be completed in fall 2027.
How Can I Get Involved?
The City of Renton welcomes your interest in its water system. The Renton City Council is the city’s decision-making body and meets on the first four Mondays of each month at 7 p.m. Meetings are conducted via videoconference and in person at the Council Chambers on the 7th floor of city hall.
The Utilities Committee oversees water utility issues. They meet the first and third Mondays of the month at 3 p.m. in the afternoon in the 7th floor Council Conference Room or via videoconference. Members of the Utilities Committee for 2026 are:
- Kim-Khánh Văn, Chair
- James Alberson, Jr., Vice-Chair
- Carmen Rivera, Member
Call the City Clerk Division at 425-430-6510 for meeting times or agenda information, or check the council calendar at rentonwa.gov/council.
Water Conservation
Small daily changes can add up to make a big difference in saving water
- Turn off the tap while brushing your teeth or soaping up your hands.
- Take shorter showers.
- Run full loads of laundry and dishes.
- Find and fix dripping faucets and running toilets.
- Skip watering your plants right after it rains.
- Use a broom, not a hose, to clean driveways and sidewalks.
Think you may have a leak? Use your water meter to check!
Your water meter does more than track your water use. It can help you spot leaks that might be quietly wasting water at home. Even small leaks add up: running toilets, dripping faucets, and underground leaks can all contribute to higher bills and hidden water waste.
To check for leaks using your meter:
- Make sure all the water in and around your home is turned off.
- Locate and open your water meter box (often in the sidewalk or parking strip).
- Read the dial or low-flow indicator. If it’s moving when nothing is running, you may have a leak.
- You can narrow down where the leak is by shutting off your home’s main valve and checking the meter again.
If your meter shows continuous flow, take steps to find and fix the leak.
Rebate for Toilet Replacement
You may have a toilet leak if you notice:
- The tank refills even when no one has flushed.
- Water continues to flow into the bowl.
- You have to jiggle the handle to stop the water from running.
- The rubber flapper looks worn or isn’t sealing properly.
Replace your old toilet and get a $100 rebate through the Saving Water Partnership. To qualify, the new toilet must be eligible for the rebate.
How it works:
- Buy and install an eligible toilet. Save the receipt.
- Within 60 days of buying your new toilet submit an online application at savingwater.org/rebates.
- You’ll need a digital copy of your receipt and a recent water bill.
- Receive a check in the mail.
Saving Water Partnership
Renton is a Member of the Saving Water Partnership
In January 2012, Renton signed an agreement to buy water from Seattle Public Utilities. As part of this agreement, the City of Renton joined the Saving Water Partnership (SWP). The SWP, which is made up of the City of Renton and 18 water utility partners around the Puget Sound, has set a ten-year conservation goal to keep the total average annual retail water use of SWP members under 110 mgd through 2028, despite forecasted population growth, by reducing per capita water use. For 2025, the SWP met the goal, using 97.9 mgd.
Why conserve? It works!
When we work together to save water, it makes a big difference. Thanks to conservation efforts, our region uses the same amount of water today that it did in the late 1950s.
Together We Provide Water Conservation Programs to the Region
In 2025, the SWP made progress in promoting environmental education and water conservation in Renton. These efforts collectively contributed to raising awareness and fostering sustainable practices, marking a successful year for the SWP in advancing environmental conservation and education within the community.
Youth Education
The SWP’s youth education program conducted 35 engaging in-classroom presentations, reaching 934 students with topics such as the water cycle, salmon life cycle, and healthy soils.
YARD CARE Renton hosted three natural yard care classes taught by local gardening professionals with 57 attendees.
WATER USE The SWP offers technical assistance to both residential and commercial customers, addressing issues related to irrigation efficiency and indoor water use.
REBATES The SWP continued to offer $100 rebates for premium toilets for both residential and commercial customers encouraging the adoption of water-efficient fixtures, which use significantly less water per flush compared to regular fixtures.
For more materials and rebates please visit the Saving Water Partnership website at savingwater.org
How Can We Help You?
Questions about this report:
Public Works Water Utility at 425-430-7287 or email utilitysystems@rentonwa.gov
Water discoloration, taste, or odor:
Public Works Water Quality at 425-430-7400, 7 a.m. to 3:30 p.m. or 425-430-7500 after hours or weekends
To report water pressure problems, water leaking in the streets, or water leaking at a meter:
Water Maintenance at 425-430-7400, 7 a.m. to 3:30 p.m. or 425-430-7500 after hours or weekends
If you are moving and need to arrange for a change of water service, or for general billing questions:
Utility Billing at 425-430-6852 or ub@rentonwa.gov
Water quality reports can be found below
This report is written and distributed in compliance with the Federal Safe Drinking Water Act, which requires water utilities to provide annual “consumer confidence” reports to their customers. You will find in this report: where our drinking water comes from; what minerals or chemicals it contains; how it compares to stringent water quality standards; what Renton is doing to protect our water supply; and what we are doing to wisely use and conserve our regional water supply. Hopefully this report will help you better understand your drinking water. We assure you that providing high-quality and safe drinking water is one of Renton’s highest priorities.
This report contains important information about your drinking water. Have someone translate it for you, speak with someone who understands it, or select a language at the top of the page.
Este reporte tiene información importante sobre el agua que toma. Pida a alguien que se lo traduzca, hable con alguien que entiende o visite rentonwa.gov/waterquality y seleccione el idioma de la parte superior de la página.
Báo cáo này có thông tin quan trọng về nước uống của quý vị. Hãy nhờ ai đó dịch cho quý vị, nói chuyện với người hiểu nội dung báo cáo này, hoặc truy cập rentonwa.gov/waterquality rồi chọn ngôn ngữ ở phần đầu trang.
这份报告包含了有关您的饮用水的重要信息。请人帮您翻译，或与了解该信息的人交流，或前往 rentonwa.gov/waterquality，并在页面顶部选择一种语言。
Current Water Quality Report
Previous Water Quality Reports
- (PDF, 1MB)2025 Water Quality Report(PDF, 4MB)
- 2024 Water Quality Report(PDF, 1MB)
- 2023 Water Quality Report(PDF, 1MB)
- 2022 Water Quality Report(PDF, 1MB)
- 2021 Water Quality Report(PDF, 784KB)
- 2020 Water Quality Report(PDF, 1MB)
- 2019 Water Quality Report(PDF, 1MB)
- 2018 Water Quality Report(PDF, 2MB)
- 2017 Water Quality Report(PDF, 2MB)
- 2016 Water Quality Report(PDF, 360KB)
- 2015 Water Quality Report(PDF, 5MB)
- 2014 Water Quality Report(PDF, 4MB)
- 2013 Water Quality Report(PDF, 3MB)
- 2012 Water Quality Report(PDF, 1MB)
- 2011 Water Quality Report(PDF, 325KB)
- 2010 Water Quality Report(PDF, 545KB)
- 2009 Water Quality Report(PDF, 1MB)
- 2008 Water Quality Report(PDF, 2MB)
- 2007 Water Quality Report(PDF, 2MB)