PFAS in drinking water has become a growing concern for homeowners across Washington State.
Often called “forever chemicals,” PFAS can remain in the environment for a long time and may find their way into drinking water sources. Washington has continued testing and monitoring for PFAS, making more homeowners curious about what may be in their tap water.
PFAS concerns are not limited to one part of Washington. The ZIP codes included in the PFAS data for this guide stretch from the Seattle and Tacoma areas to Olympia, Bellingham, Vancouver, Central Washington, Spokane, and the Tri-Cities region.
If your ZIP code appears below, it does not mean every home in that ZIP code has PFAS in its drinking water. Different neighborhoods may use different public water systems or private wells, and test results can vary by water source.
Still, finding your ZIP code on the list is a good reason to learn more about where your water comes from and what testing has been completed in your area..
Is Your Washington ZIP Code in a PFAS Concern Area?
Use the table below to quickly find your region and ZIP code.
Washington Area |
Zip Codes Included in PFAS Data |
|---|---|
Seattle Metro & Metro Puget Sound |
98003, 98010, 98027, 98032, 98042, 98052, 98075, 98125 |
Northwest Washington & North Puget Sound |
98226, 98227, 98230, 98239, 98250, 98258, 98264, 98284, 98292 |
South Puget Sound & Kitsap Peninsula |
98327, 98328, 98332, 98335, 98336, 98338, 98352, 98360, 98366, 98367, 98368, 98372, 98374, 98383, 98384, 98387, 98422, 98444, 98498, 98499 |
Olympia, South Sound & Kitsap Peninsula |
98501, 98502, 98503, 98512, 98513, 98516, 98531, 98540, 98541, 98580, 98584, 98588 |
Vancouver & Southwest Washington |
98607, 98648, 98660, 98663, 98671, 98675 |
Central Washington & Columbia Basin |
98813, 98830, 98837, 98847 |
Spokane & Eastern Washington |
99014, 99021, 99201, 99206, 99212, 99216 |
Tri-Cities & Southeast Washington |
99320, 99323, 99337 |
Note: A listed ZIP code does not mean every home in that area has PFAS in its drinking water. Water sources and test results can vary by utility, neighborhood, and private well.
What Are PFAS and Why Are Washington Homeowners Concerned?
PFAS stands for per- and polyfluoroalkyl substances. These manufactured chemicals have been used for many years in products designed to resist water, grease, stains, or heat.
PFAS are often called “forever chemicals” because many of them break down very slowly. This means they can remain in water, soil, and the environment for long periods of time.
PFAS can also move into drinking water sources, which is why public water systems, health agencies, and homeowners are paying closer attention to testing.
Washington PFAS Drinking Water Rules
Washington has also updated its drinking-water requirements.
Effective January 15, 2026, Washington updated its PFAS drinking-water rules, aligning state action levels with federal maximum contaminant levels. You can review the latest guidance on the Washington State Department of Health PFAS drinking water page.
Federal PFAS requirements are also continuing to develop. In May 2026, the EPA proposed allowing eligible public water systems to request up to two additional years through 2031 to comply with federal PFOA and PFOS limits. Learn more on the EPA’s PFOA and PFOS compliance extension page.
Because PFAS regulations can change, homeowners should check the latest information from the Washington State Department of Health and EPA when reviewing local water results.
What Should Washington Homeowners Do Next?
If your ZIP code appears in the table above, the next step is to learn more about the water serving your home.
Start with these steps:
- Identify your water source: Find out whether your home receives public water or uses a private well.
- Look for local PFAS results: Check your water provider’s latest information and Washington State Department of Health PFAS data.
- Consider specialized PFAS testing: If you want to know whether PFAS is present in your specific water, use an accredited laboratory that performs PFAS drinking-water testing.
- Consider other water concerns: Depending on where you live in Washington, your home may also experience hard water, iron, manganese, chlorine taste or odor, nitrates, sediment, or other water-quality issues.
- Choose treatment based on your water: Different water problems require different solutions.
If PFAS is found in your water, treatment options such as reverse osmosis or certain filtration systems may help reduce specific PFAS. The right solution depends on your water quality and the contaminants present.
Water softeners serve a different purpose. They are mainly designed to reduce hard-water minerals such as calcium and magnesium. A home with both hard-water and PFAS concerns may need different treatment options for each issue.
Understanding your water source and reviewing local PFAS testing can help you make a more informed decision about your home’s water.
Concerned About Your Washington Drinking Water?
Culligan helps Washington homeowners better understand their water and explore solutions for common water concerns, including hard water, unwanted tastes and odors, and drinking-water filtration needs.
Depending on your home’s water quality, treatment options may include water softeners, filtration systems, or reverse osmosis drinking-water systems.
Concerned about your home’s water? Contact your local Culligan dealership to schedule a free in-home water test and learn which water-treatment options may be right for your home.*
*Standard in-home water testing may not include PFAS. Specialized PFAS testing may require an accredited laboratory.
