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Is Renton Tap Water Safe to Drink?

Yes! Generally Safe to Drink*

LAST UPDATED: 7:47 pm, July 26, 2022

Table of Contents

Can You Drink Tap Water in Renton?

Yes, Renton's tap water is generally considered safe to drink as Renton has no active health based violations of the Safe Drinking Water Act (SDWA) that we are aware of. Other factors such as lead piping in a home, or low levels of pollutants on immunocompromised individuals, should also be considered, however. To find more recent info we might have, you can check out our boil water notice page or the city's water provider website.

According the EPA’s ECHO database, from April 30, 2019 to June 30, 2022, Renton's water utility, City of Renton, had 0 violations of the Safe Drinking Water Act. For more details on the violations, please see our violation history section below. This assessment is based on the City of Renton water system, other water systems in the city may have different results.

While tap water that meets the EPA health guidelines generally won’t make you sick to your stomach, it can still contain regulated and unregulated contaminants present in trace amounts that could potentially cause health issues over the long-run. These trace contaminants may also impact immunocompromised and vulnerable individuals.

The EPA is reviewing if it’s current regulations around pollutant levels in tap water are strict enough, and the health dangers posed by unregulated pollutants, like PFAS.

Water Quality Report for Renton Tap Water

The most recent publicly available numbers for measured contaminant levels in Renton tap water are in its 2020 Water Quality Report. As you can see, there are levels which the EPA considers to be acceptable, but being below the maximum allowable level doesn’t necessarily mean the water is healthy.

Lead in tap water, for example, is currently allowed at up to 15ppb by the EPA, but it has set the ideal goal for lead at zero. This highlights how meeting EPA standards doesn’t necessarily mean local tap water is healthy.

EPA regulations continue to change as it evaluates the long term impacts of chemicals and updates drinking water acceptable levels. The rules around arsenic, as well as, lead and copper are currently being re-evaluated.

There are also a number of "emerging" contaminants that are not currently. For example, PFAS (Per- and polyfluoroalkyl substances), for which the EPA has issued a health advisory. PFAS are called "forever chemicals" since they tend not to break down in the environment or the human body and can accumulate over time.

We recommend looking at the contaminants present in Renton's water quality reports, or getting your home's tap water tested to see if you should be filtering your water.

Renton Tap Water Safe Drinking Water Act Violation History - Prior 10 Years

Below is a ten year history of violations for the water system named City of Renton for Renton in Washington. For more details please see the "What do these Violations Mean?" section below.

Is there Lead in Renton Water?

Based on the EPA’s ECHO Database, 90% of the samples taken from the Renton water system, City of Renton, between sample start date and sample end date, were at or below, 0.001 mg/L of lead in Renton water. This is 6.7% of the 0.015 mg/L action level. This means 10% of the samples taken from Renton contained more lead.

While Renton water testing may have found 0.001 mg/L of lead in its water, that does not mean your water source has the same amount. The amount of lead in water in a city can vary greatly from neighborhood to neighborhood, or even building to building. Many buildings, particularly older ones, have lead pipes or service lines which can be a source of contamination. To find out if your home has lead, we recommend getting you water tested.

No amount of lead in water is healthy, only less dangerous. As lead accumulates in our bodies over time, even exposure to relatively small amounts can have negative health effects. For more information, please check out our Lead FAQ page.

Are there PFAS in Renton Tap Water?

Currently, testing tap water for PFAS isn’t mandated on a national level. We do have a list of military bases where there have been suspected or confirmed leaks. There appears to be at least one military base - Puget Sound NS Sand Point - near Renton with suspected leaks.

With many potential sources of PFAS in tap water across the US, the best information we currently have about which cities have PFAS in their water is this ewg map, which you can check to see if Renton has been evaluated for yet.

Our stance is better safe than sorry, and that it makes sense to try to purify the tap water just in case.

What do these Violations Mean?

Safe Drinking Water Act Violations categories split into two groups, health based, and non-health based. Generally, health based violations are more serious, though non-health based violations can also be cause for concern.

Health Based Violations

  1. Maximum contaminant levels (MCLs) - maximum allowed contaminant level was exceeded.
  2. Maximum residual disinfectant levels (MRDLs) - maximum allowed disinfectant level was exceeded.
  3. Other violations (Other) - the exact required process to reduce the amounts of contaminants in drinking water was not followed.

Non-Health Based Violations

  1. Monitoring and reporting violations (MR, MON) - failure to conduct the required regular monitoring of drinking water quality, and/or to submit monitoring results on time.
  2. Public notice violations (Other) - failure to immediately alert consumers if there is a serious problem with their drinking water that may pose a risk to public health.
  3. Other violations (Other) - miscellaneous violations, such as failure to issue annual consumer confidence reports or maintain required records.

SDWA Table Key

Field Description
Compliance Period Dates of the compliance period.
Status Current status of the violation.
  • Resolved - The violation has at least one resolving enforcement action. In SDWIS, this indicates that either the system has returned to compliance from the violation, the rule that was violated was no longer applicable, or no further action was needed.
  • Archived - The violation is not Resolved, but is more than five years past its compliance period end date. In keeping with the Enforcement Response Policy, the violation no longer contributes to the public water system's overall compliance status. Unresolved violations are also marked as Archived when a system ceases operations (becomes inactive).
  • Addressed - The violation is not Resolved or Archived, and is addressed by one or more formal enforcement actions.
  • Unaddressed - The violation is not Resolved or Archived, and has not been addressed by formal enforcement.
show details
Health-Based? Whether the violation is health based.
Category Code
The category of violation that is reported.
  • TT - Treatment Technique Violation
  • MRDL - Maximum Residual Disinfectant Level
  • Other - Other Violation
  • MCL - Maximum Contaminant Level Violation
  • MR - Monitoring and Reporting
  • MON - Monitoring Violation
  • RPT - Reporting Violation
show details
Code A full description of violation codes can be accessed in the SDWA_REF_CODE_VALUES (CSV) table.
Contaminant Code A code value that represents a contaminant for which a public water system has incurred a violation of a primary drinking water regulation.
Rule Code Code for a National Drinking Water rule.
  • 110 - Total Coliform Rule
  • 121 - Surface Water Treatment Rule
  • 122 - Long Term 1 Enhanced Surface Water Treatment Rule
  • 123 - Long Term 2 Enhanced Surface Water Treatment Rule
  • 130 - Filter Backwash Rule
  • 140 - Ground Water Rule
  • 210 - Stage 1 Disinfectants and Disinfection Byproducts Rule
  • 220 - Stage 2 Disinfectants and Disinfection Byproducts Rule
  • 230 - Total Trihalomethanes
  • 310 - Volatile Organic Chemicals
  • 331 - Nitrates
  • 332 - Arsenic
  • 333 - Inorganic Chemicals
  • 320 - Synthetic Organic Chemicals
  • 340 - Radionuclides
  • 350 - Lead and Copper Rule
  • 410 - Public Notice Rule
  • 420 - Consumer Confidence Rule
  • 430 - Miscellaneous
  • 500 - Not Regulated
  • 111 - Revised Total Coliform Rule
show details
Rule Group Code Code that uniquely identifies a rule group.
  • 120 - Surface Water Treatment Rules
  • 130 - Filter Backwash Rule
  • 140 - Groundwater Rule
  • 210 - Stage 1 Disinfectants and Disinfection Byproducts Rule
  • 220 - Stage 2 Disinfectants and Disinfection Byproducts Rule
  • 230 - Total Trihalomethanes
  • 310 - Volatile Organic Chemicals
  • 320 - Synthetic Organic Chemicals
  • 330 - Inorganic Chemicals
  • 340 - Radionuclides
  • 350 - Lead and Copper Rule
  • 400 - Other
  • 500 - Not Regulated
  • 110 - Total Coliform Rules
  • 410 - Public Notice Rule
  • 420 - Consumer Confidence Rule
  • 430 - Miscellaneous
show details
Rule Family Code Code for rule family.
  • 100 - Microbials
  • 200 - Disinfectants and Disinfection Byproducts Rule
  • 300 - Chemicals
  • 400 - Other
  • 500 - Not Regulated
show details

For more clarification please visit the EPA's data dictionary.

Renton Water - Frequently Asked Questions

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. The Utilities Committee oversees Water Utility issues. They meet the first and third Monday of the month at 3:30 p.m. At the time of publication, due to the COVID-19 pandemic, councilmembers are attending meetings remotely through Zoom. Public testi- mony during public hearings and audience comments will be accommodated through Zoom and by telephone, but the public is requested to sign up for such testimony by emailing in advance. Members of the Utilities Committee for 2021 are: Angelina Benedetti, Chair Valerie O’Halloran, Vice-Chair Kim-Khánh Văn, Member Call the City Clerk’s office at 425-430-6510 for meeting or agenda information, or check the City Council calendar at
To contact customer service for the Renton water provider, City of Renton, please use the information below.
By Mail: 3555 NE 2nd St
Renton, WA, 98056
Already have an account?

Existing customers can login to their City of Renton account to pay their Renton water bill by clicking here.

Want to create a new account?

If you want to pay your City of Renton bill online and haven't made an account yet, you can create an account online. Please click here to create your account to pay your Renton water bill.

Want to pay without an account?

If you don't want to make an account, or can't remember your account, you can make a one-time payment towards your Renton water bill without creating an account using a one time payment portal with your account number and credit or debit card. Click here to make a one time payment.

Starting Your Service

Moving to a new house or apartment in Renton means you will often need to put the water in your name with City of Renton. In order to put the water in your name, please click the link to the start service form below. Start service requests for water bills typically take two business days.

Start Service Form

Want to create a new account?

Leaving your house or apartment in Renton means you will likely need to take your name off of the water bill with City of Renton. In order to take your name off the water bill, please click the link to the stop service form below. Stop service for water bills requests typically take two business days.

Stop Service Form

The estimated price of bottled water

$2 in USD (1.5-liter)


Renton tap water
  • Drinking Water Pollution and Inaccessibility 6% Very Low
  • Water Pollution 17% Very Low
  • Drinking Water Quality and Accessibility 94% Very High
  • Water Quality 83% Very High

The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Renton, measured on a scale from 0% (lowest) to 100% (highest).

Related FAQS

Renton Water Quality Report (Consumer Confidence Report)

The EPA mandates that towns and cities consistently monitor and test their tap water. They must report their findings in an annual Consumer Confidence Report. Below is the most recent water quality report from Renton's Water. If you would like to see the original version of the report, please click here.










Water Source and Treatment

Renton’s Water Sources

IN 2020, the City of Renton obtained its drinking water from four sources:

  1. Six downtown wells located in Liberty and Cedar River Parks, which draw water from the Cedar Valley Aquifer
  2. Springbrook Springs, a small spring located in south Renton
  3. The Maplewood wellfield located under the Maple- wood Golf Course
  4. An agreement to buy water from Seattle Public Utilities (SPU), who source water from the Cedar and Tolt rivers

Our agreement with SPU began in January 2012. During 2020, SPU provided approximately 11.6 million gallons of water that were used by the Renton Boeing plant. Water is purchased from SPU primarily for the Renton Boeing plant and as a backup supply during summer peak use peri- ods. More information available at SPU: waterqualityreport.

In 2020, the combined four water sources produced approx- imately 2.51 billion gallons of water.

Providing Safe, Clean Water

THE WATER PUMPED from the downtown wells and Springbrook Springs is naturally very clean and needs minimal treatment. Chlorine is added 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. Sodium hydroxide is added to slightly raise the pH of the water to help prevent the corrosion of household plumbing. Ortho-polyphosphates are added to reduce the internal corrosion of old cast iron water mains found in the neighborhood of West Hill. Fluoride is added to prevent tooth decay. The downtown wellfield produced 58% of Renton’s water in 2020. Springbrook Springs produced 19% of Renton’s water in 2020.

Maplewood water is clean as well, but due to naturally occur- ring minerals, it must first be treated before it is pumped into the distribution system. The treatment process consists of removing manganese, hydrogen sulfide, and ammonia from the source water. Chlorine is added to protect the water in the distribution system and fluoride is added to prevent tooth decay. The Maplewood wellfield produced 23% of Renton’s water in 2020.


9 wells

1 spring

gallons produced for the

& SPU interties


City of Renton in 2020 from...





miles of water


main in service






gallons produced



on an average day





total metered






gallons produced

gallons produced





on low demand day

on high demand day


2021 City of Renton Water Quality Report

April 20, 2020

August 17, 2020



Water Use Efficiency

IN 2003, 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 Water Use Efficiency (WUE) Rule is part of this law and requires municipal water suppli- ers to report their goals and progress each year.

In early 2021, Renton hosted a public forum and updated the WUE goals as part of the Water System Plan Update. The city has proposed the following measurable goals:

  1. Reduce DSL to 10 percent or less by 2022.
  2. Limit the Maximum Daily Demand to Average Daily Demand peaking factor to less than 2.0.
  3. Maintain an ERU value under 160 gpd/ERU (gallons per day/Equivalent Residential Unit)

As part of the Saving Water Partnership, 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 fore- casted population growth by reducing per capita water use.


RENTON’S TOTAL WATER PRODUCED and purchased in 2020 was 2,510,150,705 gallons. Distribution system leakage (DSL) is reported in the 2020 Water Use Efficiency report to the Washington State Department of Health (DOH) as a three- year rolling average, calculated to be 11.1%. Renton’s DSL for the 2020 calendar year was 12.3%, or 309,246,324 gallons. This is a 1.3% increase from 2019. Our three-year rolling aver- age increased by 0.6%. DSL reflects the amount of water and potential revenue that has been lost due to water theft, water main breaks and leaks, meter inaccuracies, and other causes.


SINCE THE THREE-YEAR (2018–2020) annual average of the city’s distribution system leakage exceeds 10%, we are 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 reser- voirs and repair leaky joints on concrete floors and walls.
  • Continue using Advanced Metering Infrastructure (AMI) technology to detect leaks.

Salmon-Smart Habits

Summer is peak water use season—the time when rain stops and people use more water in their yards and gardens. It is especially import- ant to conserve water in summer and fall when stream flows are lowest. Your actions can help to protect salmon and their freshwater habitat.

  • Never dump oil or other chemicals down storm drains, and make sure no pollutants are leaking that could get washed into waterways (includ- ing pressure washing).
  • Sweep sidewalks and driveways instead of hosing. Put sweepings in the garbage to prevent pollutants and debris from entering streams.
  • Use automatic car washes that recycle water and perform proper disposal of detergents.
  • Plant native plants and trees to reduce the need for watering, pest control and fertilization; and reap multiple benefits such as controlling ero- sion, reducing flooding, filtering pollution, and attracting wildlife.
  • Use compost as a natural fertilizer on your lawn, flowers, and garden beds. Compost supports healthy plant roots and slowly releases water to plants. Avoid non-organic fertilizers.

2021 City of Renton Water Quality Report 3

Message From the EPA

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 Environmental Protection Agency’s Safe Drinking Water Hotline at 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 healthcare providers. Environmental Protection Agency (EPA)/ Centers for Disease Control (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 at 800-426-4791.

Reliable Water When You Need It Most

Our COVID-19 Response

THROUGHOUT THE COVID-19 RESPONSE in 2020 and 2021, the City of Renton worked diligently to ensure the deliv- ery of safe drinking water to our customers and maintain adequate water supply for fire protection. For community resilience, one of our highest priorities bas been to ensure safe and reliable water comes out of the faucet for hand- washing and cleaning. In early March 2020, the City’s Water Utility staff implemented continuity of operations planning and took steps to reduce exposure for staff such that our water operations team could keep the system running and protected against pathogens. Our certified water treatment operators are mission critical, continuing to collect water quality samples from the system daily.

According to the World Health Organization (WHO), COVID-19 has not been detected in drinking water supplies and the current risk to drinking water continues to be low. The U.S. Environmental Protection Agency (EPA) recom- mends that Americans continue to use and drink water from their tap as usual.


Environmental Protection Agency (EPA) coronavirus-and-drinking-water-and-wastewater

Ensuring Water Safety

To ensure that tap water is safe to drink, the DOH and EPA prescribe regulations that limit the amount of certain contaminants in water provided by public water systems.

The Food and Drug Administration and the Washington Department of Agriculture regula- tions establish limits for contaminants in bottled water that must provide the same protection for public health.

4 2021 City of Renton Water Quality Report

Sustainable Gardening: Saving Water This Summer

Creating a Sustainable, Water- Saving Garden this Summer


  • Avoid evaporation by watering early in the morning and late at night.
  • Water deeply, but infrequently. This encourages deep roots.
  • Water lawns with one inch of water per week. Or, let areas of your lawn go brown and dormant, but water enough to moisten root zone once a month.


  • Inspect your irrigation system for leaks. An unusually green spot in the lawn may be a clue that there is a leak in the system.
  • For automatic irrigation systems, install a rain shutoff device.


  • Pick plants that resist pests and require less water.
  • Group plants by their needs. Place plants that need regu- lar watering together so that you don’t have to water the whole yard every day.
  • Plant native plants and trees to reduce the need for watering, pest control and fertilization, and reap multiple benefits of controlling erosion, reducing flooding, filter- ing pollution and attracting wildlife.
  • Make space for wildlife by planting native species and avoiding invasive and exotic plants. You can also pro- vide a small water source such as a birdbath and leave wild “buffers” of native plants along fencelines, ravines, streams, and shorelines.


  • Use compost as a natural fertilizer on your lawn, flowers, and garden beds. Compost supports healthy plant roots and slowly releases water to plants.
  • Mulch your shrub and tree beds with wood chips, leaves, or bark once per year to conserve water, reduce weeds, feed the soil, and prevent evaporation. Mulch should be several inches deep and one inch away from the plant stems.

Learn more about water-efficient gardening and access other outdoor videos, tips, tools, and rebates to help people preserve our region’s water for future generations at

Water Your Garden with Recycled Water

There are many ways you can recycle the water you use indoors to help water your plants! Here are a few ideas:

Wash your fruits and vegetables in a bowl and pour that water in your garden.

Collect the water left in your glass after meals, and share that leftover water with your plants.

Put a bucket in the shower while your water heats up. Once the water cools, your plants will love a fresh drink of saved water!

2021 City of Renton Water Quality Report 5

Renton and the Saving Water Partnership

Renton is a Member of the Saving Water Partnership

RENTON SIGNED AN AGREEMENT to buy water from Seattle Public Utilities in January 2012. 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 17 water util- ity partners, set a regional conservation goal: 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 2020, the SWP met the goal, with annual retail water use of members of the SWP at 91.2 mgd.

Together We Provide Water Conservation Programs to the Region






In 2020, the SWP youth education program conducted 348 in-classroom presentations to over 7,600 K–8 students. Two popular classes were the water cycle and the salmon life cycle. Many classes in 2020 were adapted to a new format and taught to students virtually. In Renton, Nature Vision taught 29 classes to 556 students in 2020 as part of this program.

The SWP continued the sprinkler timer rebate program. Nearly 50 customers replaced inefficient sprinkler timers with new WaterSense timers.

The SWP provided rebates for Premium toilets for residential and commercial cus- tomers. These fixtures use 1.1 gallons of water per flush (or less), at least 20% less water than a regular WaterSense fixture.

The Single Family Toilet Rebate Program upgraded 435 toilets to Premium toilet models and the Multifamily Toilet Replace- ment Program upgraded 88 toilets to Premium models.

The SWP presented nine Savvy Gardener classes in the spring, summer, and fall of 2020 with 243 attendees. These classes enable gardeners to create and maintain healthy landscapes that are good for fam- ilies and the environment. Renton hosted three of these classes with a total of 89 participants.

6 2021 City of Renton Water Quality Report

Save Water with Indoor Water Conservation Tips

Bathroom Leaks

The faster you fix a leak, the better! Bathrooms are a great place to start looking for leaks since over half of all home water use takes place in the bathroom.


Turn the faucet on and off. Then, look and listen for water dripping out of the faucet or pooling around the base of the fixture.


Turn the showerhead on and look for any dripping water or stray sprays at connection points.


Turn the tub on, then divert the water to the shower. If there is still a lot of water coming from the tub faucet it may be time to replace the spout diverter.

More Tips for Indoor Water Use

  • Scrape, do not rinse, dishes before using a dishwasher.
  • Turn off the tap while brushing your teeth or shaving.
  • Choose five-minute showers instead of baths.
  • Always run full laundry and dish loads.
  • Thaw frozen food in the fridge, not by running water.

Fix Leaks, Prevent Water Waste from Leaking Toilets

Look, listen, and lift the lid to detect toilet leaks.

Look at the bowl of your toilet to see if water flows from the tank when you have not flushed. If water is dribbling into the bowl, you have a leak.

Listen to the tank. If it sounds like it is re-filling even when you haven’t flushed, that means you have a leak.

Lift the top off your toilet’s tank and check to see if the rubber seal or “flapper” looks worn out. If the rubber is cracking or not creating a complete seal, you have a leak.

You can detect silent leaks with food coloring. Put food coloring or a dye strip in the tank, don’t flush, and see if the color appears in the bowl. If it does, you have a leak.

To fix leaks, call a local plumber or do-it-yourself using the videos and tools at: Many of the repairs may be simpler than you think.

2021 City of Renton Water Quality Report 7

Water Quality Topics

Lead and Your Health

IF PRESENT, elevated levels of lead can cause serious health problems, especially for pregnant women and young chil- dren. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing.

The City of Renton Water Utility is responsible for provid- ing 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 mini- mize the potential for lead exposure by flushing your tap for

30 seconds to two 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

If you flush your tap, you can use the flushed water for water- ing plants or general cleaning. Hot water is likely to contain higher levels of lead. Only use water from the cold-water tap for drinking, cooking, and especially for making baby formula. 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. Until seven years ago, the legal limit for “lead-free” pipes was up to 8% lead. 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 exist- ing fixtures, such as those found in many older homes.

Lead Prevention in Renton

RENTON WORKS TO PREVENT the corrosion of not only lead, but other metals such as copper and iron. First, the pH of the water is adjusted to prevent the corrosion of house- hold plumbing—the major possible source of lead in our water. Second, in areas of the city with cast iron water mains (West Hill), ortho-polyphosphates are added to prevent corrosion. To make sure this treatment is working, water is periodically tested at residential taps. This testing is in compliance with the DOH’s Lead and Copper Rule. More information is available at


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

Water Hardness

RENTON’S WATER FALLS within the slightly hard, moder- ately hard, and hard range, depending upon the customer’s water source within the City. The most recent water hardness testing showed 54 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 natu- rally 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. This means that dish washing and clothes washing require relatively less soap than in other areas where the water is hard. If you do not know which water source your drinking water comes from, the water utility can help.



mg/L & ppm





Less than 1

Less than 17.1







Slightly Hard






Moderately Hard










Over 10

Over 180

Very Hard




8 2021 City of Renton Water Quality Report

Water Quality Topics

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 combi- nation of our water sources.







Average pH (2020)

7.5 –7.8



Total hardness as Calcium


Carbonate, ppm (2019)




Sodium, ppm (2019)




Sulfate, ppm (2019)




Chloride, ppm (2019)








Calcium, ppm (2004)




Magnesium, ppm (2004)




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.

The Utilities Committee oversees Water Utility issues. They meet the first and third Monday of the month at 3:30 p.m.

At the time of publication, due to the COVID-19 pandemic, councilmembers are attending meetings remotely through Zoom. Public testi- mony during public hearings and audience comments will be accommodated through Zoom and by telephone, but the public is requested to sign up for such testimony by emailing in advance.

Members of the Utilities Committee for 2021 are:

Angelina Benedetti, Chair Valerie O’Halloran, Vice-Chair Kim-Khánh Văn, Member

Call the City Clerk’s office at 425-430-6510

for meeting or agenda information, or check the City Council calendar at

PFAS Chemicals

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 contamina- tion in drinking water linked to the use of firefighting foam.

The EPA has established a health advisory level (HAL) for perfluorooctanoic acid (PFOA) and perfluorooctyl sulfonate (PFOS) at 70 parts per trillion (ppt). This is not a regulatory standard, but in Washington state the DOH is currently considering setting a state standard for PFAS. The Renton Water Utility tested for perfluorinated compounds in 2014 and 2015 under an EPA rule for unregulated contaminants. Perfluorinated compounds were not detected in any of the drinking water samples.

For more information, please visit and

Lead Testing in Schools

THE WASHINGTON STATE DEPARTMENT OF HEALTH has developed a program to provide voluntary testing for lead in drinking water in elementary schools. For updated infor- mation, please visit:

2021 City of Renton Water Quality Report 9

2020 Renton Water Quality Results






Highest Amount


Detected Substance





Possible Sources

Fluoride1 (ppm)




0.8 (0.5–0.8)

Water additive to prevent tooth decay

Nitrate (ppm)




2.1 (0.3–2.1)

Fertilizer runoff; leaching from septic tanks;

erosion of natural deposits






Total Trihalomethanes (ppb)




3.7 (ND–3.7)

Disinfection by–products







Arsenic (ppb)




1.4 (ND–1.4)

Erosion of natural deposits

Sodium2 (ppm)


Not Established


18 (13–18)

Erosion of natural deposits; water treatment







*The water quality information presented is from the most recent testing within the last five years.








Average Amount


Detected Substance





Possible Sources

Chlorine (ppm)


4 (MRDL)


1 (0.5–1.6)

Additive to control microbes

Total Trihalomethanes**




14 (5.9–21.4)

Disinfection by-products







Haloacetic Acids** (ppb)




4.6 (1.2–8)

Disinfection by-products







** In 2016, Renton qualified for reduced monitoring for total trihalomethanes and haloacetic acids. Sampling occurs at two sites once per year.






90th Percentile***


Detected Substance





Possible Sources

Lead3 (ppb)




1 (ND–2)

Corrosion of plumbing systems; erosion of






natural deposits

Copper3 (ppm)




0.17 (0.03–0.23)

Corrosion of plumbing systems; erosion of






natural deposits

*** 90th Percentile: i.e. 90 percent of the samples were less than the values shown.


Includes sampling at the source before treatment, at the source after treatment, and in the distribution system






Detected Substance


Average Amount (Range)

Possible Sources

Manganese (ppb)



0.6 (0.5–0.7)

Erosion of natural deposits

Bromide (ppb)



32 (ND–32)

Naturally present in the environment

HAA5 (ppb)



5.5 (3.4–7.5)

Disinfection by-products

HAA6Br (ppb)



3.3 (3.1–3.5)

Disinfection by-products

HAA9 (ppb)



8.3 (5.9–10.6)

Disinfection by-products

  1. Renton measures fluoride levels daily in the distribution system. Beginning in April 2016, Renton lowered the fluoride level to 0.7 ppm, which is the new level recommended by the Washington State Department of Health. Renton citizens voted to add fluoride to the drinking water in 1985.
  2. 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.
  3. There were 30 samples tested for lead and copper. All of the samples tested had levels far below the Action Levels for both lead and copper.
  4. The EPA has established MRLs for UCMR4 based on the capability of the analytical method and therefore states the lowest detection limit of the instrument. It is not based on a level established as “significant” or “harmful.” The detection of a UCMR4 contaminant does not represent cause for concern in and of itself. The purpose of unregulated contaminant monitoring is to help EPA determine their occurrence in drinking water and potential need for future regulation.

10 2021 City of Renton Water Quality Report

Seattle Public Utility’s Masonry Pool in the Cedar River Watershed

Your Water is Safe

Water from the City of Renton Water Utility and Seattle Public Utilities meet all regulatory standards, ensuring that your water is safe to drink.

2020 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 2020 water quality monitoring requirements performed by SPU for the Cedar River and Tolt River sources are shown below.



EPA’s Allowable Limits

Levels in Cedar Water

Levels in Tolt Water


Detected Substance





Average Range

Possible Sources














Total Organic Carbon (ppm)







Naturally present in the environment


Turbidity (NTU)



Arsenic (ppb)



Barium (ppb)



Bromate (ppb)



Fluoride (ppm)













0.04 0.02–0.18

0.4 0.3–0.5

1.2 1.1–1.3



0.7 0–0.8

Soil runoff

Erosion of natural deposits

Erosion of natural deposits

Disinfection by-products

Water additive to prevent tooth decay


AL: Action Level – The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.

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.

MRL: Minimum Reporting Level

NA: Not Applicable

ND: Not Detected

NTU: Nephelometric Turbidity Unit – Turbidity is a measure of how clear the water looks. The turbidity MCL that applied to the Cedar supply in 2020 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 2020 were below 0.3 NTU.

ppb: 1 part per billion = 1 ug/L = 1 microgram per liter. 1 ppm = 1000 ppb.

ppm: 1 part per million = 1 mg/L = 1 milligram per liter. 1 ppm = 1000 ppb.

  1. Treatment Technique – A required process
    intended to reduce the level of a contaminant in drinking water.

2021 City of Renton Water Quality Report 11

How Can We Help You?

Questions about this report:

Water Utility Engineering at 425-430-7287

Water discoloration, taste, or odor:

Water Quality at 425-430-7400

(7 a.m.–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.–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


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, or speak with someone who understands it.

Este informe contiene información importante acerca de su agua potable. Haga que alguien lo traduzca para usted, o hable

con alguien que lo entienda.

Tài liệu này có tin tức quan trọng về nước uống của quý vị. Hãy nhờ người dịch cho quý vị, hoặc hỏi người nào hiểu tài liệu này.

Warbixintan waxay wadataa macluumaad muhiim ah ee la xiriira biyaha aad cabtid. Cid ha kuu tarjunto ama la hadl cid fahmaysa.

Karkari biyaha inta aadan isticmaalin.


12 2021 City of Renton Water Quality Report


City of Renton

EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the Washington State Department of Health, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2019 - March 2019), tap water provided by this water utility was in compliance with federal health-based drinking water standards.

Utility details

  • Serves: 62100
  • Data available: 2012-2017
  • Data Source: Groundwater
  • Total: 16

Contaminants That Exceed Guidelines

  • Bromodichloromethane
  • Chloroform
  • Chromium (hexavalent)
  • Dibromochloromethane
  • Nitrate
  • Total trihalomethanes (TTHMs)
  • Trichloroacetic acid

Other Detected Contaminants

  • Bromochloroacetic acid
  • Bromoform
  • Chlorate
  • Chromium (total)
  • Dichloroacetic acid
  • Fluoride
  • Haloacetic acids (HAA5)
  • Strontium
  • Vanadium


Always take extra precautions, the water may be safe to drink when it leaves the sewage treatment plant but it may pick up pollutants during its way to your tap. We advise that you ask locals or hotel staff about the water quality. Also, note that different cities have different water mineral contents.

Sources and Resources


If you have read many of my previous articles, you will know that I am an advocate of drinking tap water, and it is for many reasons. Not only is drinking water safer, it is also healthier for your health, especially your immune system and your overall health. Many people are looking for ways to improve their health, and many have become skeptical over the last few years because of the scare that came with the water crisis in Flint, Michigan.

I was skeptical when I first began drinking tap water in North Carolina, but I soon discovered why I was getting sick so much. You see, when I was growing up, I was told that I could drink anything that was sold to me as having ''pure'' water.

The problem is that there is so much contamination in tap water that it is virtually impossible to be sure if you are actually drinking pure water. There are so many contaminants that the EPA has banned the use of chlorine in drinking water, because it causes a lot of healt

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