Per- and polyfluoroalkyl substances (PFAS) 

On June, 2021 the U.S. Army began testing drinking water from private water wells on properties near the Yakima Training Center.  The testing looked for concentrations of per- and polyfluoroalkly substances (PFAS) in the well water.  Households with PFAS concentrations that exceeded the Environmental Protection Agency’s Lifetime Health Advisory were notified and advised to use an alternative safe drinking water source to reduce their risk of exposure to PFAS.

Washington State PFAS Drinking Water Standards

Washington State has adopted State Action Levels (SALS) for five PFAS. SALS are based on the best available science and represent the levels when it is recommended you take action to reduce your exposure to PFAS in your drinking water. 

PFAS ChemicalsState Action Levels (SALS)
PFOA10 ppt*
PFOS15 ppt*
PFHxS9 ppt*
PFNA65 ppt*
PFBS345 ppt*

*ppt = parts per trillion or ng/L.

For more information about Washington' SALs, visit:

What should you do if PFAS has been detected in your drinking water?

pfas webpage graphic 

Touching products made with PFAS or touching water that contains PFAS is not considered a significant source of exposure.

What are PFAS?

PFAS are man made chemicals that have been used since the 1950s to make a wide variety of stain-resistant, water-resistant, and non-stick consumer products. The most commonly studied PFAS are perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS).

Some examples of products that contain PFAS include:

  • Food packaging
  • Non-stick cookware
  • Outdoor clothing
  • Firefighting foams
  • Stain resistant fabrics and carpets
  • Products that resist grease, water, and oil

How are people exposed to PFAS?

People are primarily exposed to PFAS by ingesting contaminated food or water, or by using products that contain PFAS. People can also be exposed by unintentionally swallowing soil or indoor dust that contain PFAS or breathing PFAS in indoor or outdoor air.

How do PFAS get into drinking water?

PFAS can get into drinking water if they are made, used, disposed of, or spilled onto the ground or into lakes and rivers. When this happens and depending on where you live, your public drinking system or private well water could be impacted or contaminated.

What are possible health concerns with PFAS?

Scientists are still studying how PFAS affect people's health. What is currently known about the health effects of PFAS is based on animal studies and  findings from observational studies in humans that have been exposed to PFAS. Such studies suggest that higher exposure to certain PFAS may lead to: 

  • Increased cholesterol levels.
  • Decreased immune response to vaccines.
  • Changes in liver enzymes that indicate liver damage.
  • Increased risk of thyroid disease.
  • Increased risk of testicular and kidney cancer.
  • Blood pressure problems during pregnancy
  • Decreased birth weights

Are certain groups at higher risk?

People who are pregnant or breastfeeding and formula-fed infants may have higher exposure to PFAS because they drink more water than most people. These groups are also in life stages where they may be especially sensitive to harmful health effects of PFAS.

What else can I do to protect myself?

WA DOH PFAS Testing Results Dashboard

The Washington State Department of Health has a dashboard with PFAS results from drinking water testing at Group A public water system sources. Click on the map to access the dashboard.

PFAS Map Opens in new window