PFAS

Learn About PFAS

Protecting public health and providing our customers with a safe water supply is the City of Washougal’s top priority, and we currently meet all federal and state requirements for water quality testing. On average we deliver 566 million gallons per year of clean and safe drinking water to more than 18,000 people in our system composed of 83 miles of water mains and service lines.

Washougal, like many communities in Washington and across the nation, is addressing an emerging issue with per-and polyfluoroalkyl (PFAS) substances. In 2024, the city began a new program of testing and reporting for PFAS in drinking water. We will continue to share information about PFAS so that you can make informed decisions.

To view the statewide PFAS Testing Results Dashboard, please visit https://doh.wa.gov/data-and-statistical-reports/washington-tracking-network-wtn/pfas/dashboard

PFAS Overview

Since the 1940s, PFAS has been used around the world in industry and in consumer products such as food packaging, non-stick cookware, waterproof clothing, stain-resistant fabrics, and firefighting foam. These synthetic chemicals can enter the environment and water supplies from multiple sources and do not break down easily, which is why PFAS are sometimes called “forever chemicals.”

PFAS in Consumer Products


New Environmental Protection Agency (EPA) Rule for PFAS

On April 10, 2024, EPA announced the final National Primary Drinking Water Regulation (NPDWR) for six PFAS. Below is a breakdown of key dates for the new EPA rule:

  • Public water systems must monitor for these PFAS and have three years to complete initial monitoring (by 2027), followed by ongoing compliance monitoring. Water systems must also provide the public with information on the levels of these PFAS in their drinking water beginning in 2027.
  • Public water systems have five years (by 2029) to implement solutions that reduce these PFAS if monitoring shows that drinking water levels exceed these MCLs.
  • Beginning in five years (2029), public water systems that have PFAS in drinking water which violates one or more of these MCLs must take action to reduce levels of these PFAS in their drinking water and must provide notification to the public of the violation.

PFAS Detection in Washougal

Drinking water samples collected from the Washougal Water System (ID#93400) sources included detections of the following per- and polyfluoroalkyl substances (PFAS) that were below the State Action Level (SAL) as determined by the Washington State Department of Health; however slightly above the new EPA rule of 4 parts per trillion.

On April 10, 2024, the EPA announced the final National Primary Drinking Water Regulation (NPDWR) for six PFAS. The new limit from the EPA for levels of PFAS in drinking water is set at 4 parts per trillion.

For perspective, 1 part per trillion translates to 1 second in approximately 32,000 years or a single drop of water in 20 Olympic-sized swimming pools. The recommended limits are based on long-term exposure to PFAS throughout a person’s life and represent a conservative level at which no adverse impacts are expected over a lifetime of drinking the water, even in health-sensitive populations.

The City of Washougal’s water system has 6 active wells located at two wellfields across our community. Recent testing for PFAS showed that zero samples exceeded the State Action Level for PFAS contaminants regulated by the Washington State Department of Health. However, based on the new maximum contaminant level (MCL) set by the Environmental Protection Agency (EPA), we do have some levels that are above the unprecedented MCL level. Those results occurred at least one time, on at least one PFAS substance at each of the 6 city wellheads.

EPA RULE – Maximum Contaminant Level (MCL) Table

Compound

Final MCLG

Final MCL (enforceable levels)

PFOA

Zero

4.0 parts per trillion (ppt) (also expressed as ng/L)

PFOS

Zero

4.0 ppt

PFHxS

10 ppt

10 ppt

PFNA

10 ppt

10 ppt

HFPO-DA (commonly known as GenX Chemicals)

10 ppt

10 ppt

Mixtures containing two or more of PFHxS, PFNA, HFPO-DA, and PFBS

1 (unitless)

Hazard Index

1 (unitless)

Hazard Index


City of Washougal Initial Results

  1. November 2025
  2. August 2025
  3. May 2025
  4. February 2025

 

Well lDPFOA ResultPFOA SALPFOA EPA
(ppt)10ppt4ppt
Well 1*NDBelowBelow
Well 52.68BelowBelow
Well 63.03BelowBelow
Well 7*NDBelowBelow
Well 113.20BelowBelow
Well 123.47BelowBelow
ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect












Well lDPFHxSPFHxS SALPFHxS EPA
(ppt)65ppt10ppt
Well 1*NDBelowBelow
Well 5*NDBelowBelow
Well 6*NDBelowBelow
Well 7*NDBelowBelow
Well 11*NDBelowBelow
Well 12*NDBelowBelow
ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect












Well lDHFPO-DAHFPO-DA SALHFPO-DA EPA
(ppt)n/a10ppt
Well 1*NDBelowBelow
Well 5*NDBelowBelow
Well 6*NDBelowBelow
Well 7*NDBelowBelow
Well 11*NDBelowBelow
Well 12*NDBelowBelow
ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect












MISCELLANEOUS RESULTS


Well lDPFHxA ResultPFHxA SALPFHxA EPA
(ppt)n/a560,000ppt
Well 1*NDBelowBelow
Well 5*NDBelowBelow
Well 6*NDBelowBelow
Well 7*NDBelowBelow
Well 11*NDBelowBelow
Well 122.17BelowBelow
ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect












 

Well lDPFOS ResultPFOS SALPFOS EPA
(ppt)15ppt4ppt
Well 1*NDBelowBelow
Well 55.28BelowAbove
Well 64.62BelowAbove
Well 72.61BelowBelow
Well 116.73BelowAbove
Well 126.35BelowAbove
ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect













Well lDPFNAPFNA SALPFNA EPA
(ppt)9ppt10ppt
Well 1*NDBelowBelow
Well 5*NDBelowBelow
Well 6*NDBelowBelow
Well 7*NDBelowBelow
Well 11*NDBelowBelow
Well 12*NDBelowBelow
ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect













MIXTURES (containing more than 2 or more of PFHxS, PFNA, HFPO-DA, and PFBS)
Well lDPFBS ResultPFBS SALPFBS EPA
(ppt)345pptHazard Index 1
Well 1*NDBelowBelow
Well 52.62BelowBelow
Well 62.38BelowBelow
Well 7*NDBelowBelow
Well 112.85BelowBelow
Well 123.15BelowBelow



COW 



Hazard Index



equals 0.001





ppt = parts per trillion (1ppt is equivalent to a single drop of water in 20 Olympic-sized
 swimming pools, or 1 second in approximately 32,000 years)
SAL = Washington State Action Limit

*ND = non-detect



  1. October 2024
  2. July 2024
  3. May 2024
  4. April 2024

POTENTIAL HEALTH IMPACTS

There are many different PFAS, and we are still learning about their health impacts in people.

PFOA — Some people who drink water containing PFOA more than the State Action Level over many years may experience problems with their cholesterol, liver, thyroid, or immune system; have high blood pressure during pregnancy; have babies with lower birthweights; and be at higher risk of getting certain types of cancers.

PFOS — Some people who drink water containing PFOS more than the State Action Level over many years may experience problems with their cholesterol, liver, thyroid, kidney, or immune systems; or have children with lower birthweights.

CITY ACTIONS TO PROTECT WATER QUALITY

Work underway includes:

  • Testing the water supply: Operations staff continue to test and monitor water quality in compliance with state and federal requirements to ensure a safe water supply.
  • Evaluating treatment options: Water quality engineers are evaluating treatment technologies to remove PFAS from the water supply.
  • Finding long-term solutions: Expert scientists are investigating potential sources of PFAS and the extent of PFAS in the local groundwater supply.
  • Planning for the future: Future costs for PFAS treatment are included in the City’s long-range capital plans.

Reducing costs: The City is pursuing state and federal grants and loans to reduce the impact on ratepayers.

Adjusting operations: Prioritize sources of water supply with lower levels of PFAS to operate before sources with higher levels to reduce concentrations within the distribution system.

Interim measures: The City is exploring potential interim mitigation measures until long-term solutions are in place.

Sharing information: Up-to-date information on PFAS and test results are being shared with all customers and the public so you can make informed decisions.

KEEPING YOU INFORMED

The city is committed to keeping the community informed. We will continue to share actions the City is taking to keep your water safe and provide updates as we learn more about treatment options and receive updates from federal and state authorities. Timely information and PFAS sampling results will be posted at cityofwashougal.us/pfasresults.

STATEWIDE PFAS TESTING RESULTS DASHBOARD

https://doh.wa.gov/data-and-statistical-reports/washington-tracking-network-wtn/pfas/dashboard

View All

Test Results

  1. Trevor Evers

    Trevor Evers

    Public Works Director

  2. Ryan Baker

    Public Works Operations Superintendent

  3. Adam Connolly

    Utility Supervisor - Water

  1. City of Washougal Provides 4th Quarter 2025 Update on PFAS Levels in Drinking Water

    The City of Washougal is committed to keeping our residents informed about drinking water quality. Learn about recent test results for the 4th quarter of 2025. Read on...
  2. City of Washougal Provides 3rd Quarter 2025 Update on PFAS Levels in Drinking Water

    The City of Washougal is committed to keeping our residents informed about drinking water quality. Learn about recent test results for the 3rd quarter of 2025. Read on...
  3. City of Washougal Provides 2nd Quarter 2025 Update on Pfas Levels in Drinking Water

    The City of Washougal is committed to keeping our residents informed about drinking water quality. Recent tests show an increase in PFOS levels in four wells in regard to the EPA’s adopted (effective 2031) limit of 4 parts per trillion (ppt). Read on...
  4. City of Washougal Provides 1st Quarter 2025 Update on PFAS Levels in Drinking Water

    The City of Washougal is dedicated to keeping residents updated on the quality of their drinking water. Recent testing has revealed a rise in PFOS levels in two of the city’s wells, in regard to the EPA’s adopted limit of 4 parts per trillion. Read on...
  5. City of Washougal Provides 4th Quarter Update on PFAS Levels in Drinking Water

    The City of Washougal is dedicated to keeping residents updated on the quality of their drinking water. Recent testing has revealed a slight rise in PFOS levels in two of the city’s wells, in regard to the EPA’s adopted limit of 4 parts per trillion. Read on...
  6. City of Washougal Provides Update on PFAS Levels in Drinking Water

    Recent testing results show a downward trend in PFAS levels, with levels now down to just two wells approaching the EPA’s adopted limit of 4 parts per trillion (ppt). This represents a reduction of 0.53 ppt from the previous sample taken in May 2024. Read on...
  7. City of Washougal Acts on PFAS Detection in Drinking Water

    The City of Washougal has detected trace amounts of per- and polyfluoroalkyl substances (PFAS) in its drinking water supply. Read on...