PFAS in Washington tap water

34 of 248 tested systems measured above the federal limit. 68 had a detection of any kind.

Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.

Water system	Highest PFOA	Highest PFOS	Found	Against the 4 ppt limit
Artondale Water System	6.3 ppt	153.6 ppt	8 of 29	Above
Moses Lake City of	none detected	52.2 ppt	5 of 29	Above
Vancouver City of	11.5 ppt	18.6 ppt	7 of 29	Above
Richland City of	10.1 ppt	17 ppt	8 of 29	Above
Parkland Light & Water Company	6.2 ppt	13.8 ppt	6 of 29	Above
Camas Municipal Water Sewer System	4.4 ppt	12 ppt	3 of 29	Above
Quistorff	none detected	12 ppt	7 of 29	Above
Trentwood Irrigation District 3	5.1 ppt	12 ppt	5 of 29	Above
Kennewick City of	4.6 ppt	11.5 ppt	6 of 29	Above
JBLM Lewis	6.8 ppt	11.1 ppt	5 of 29	Above
Sammamish Plateau Water & Sewer	none detected	11.1 ppt	6 of 29	Above
Coupeville Town of	9.8 ppt	none detected	7 of 29	Above
Southwood Water System	6.2 ppt	8.9 ppt	6 of 29	Above
Benton City Water	none detected	8.7 ppt	6 of 29	Above
Covington Water District	none detected	8.6 ppt	5 of 29	Above
Firgrove Mutual Inc	4.4 ppt	8.6 ppt	3 of 29	Above
Clark Public Utilities	8 ppt	8.4 ppt	5 of 29	Above
Spanaway Water Company	6.2 ppt	8.3 ppt	6 of 29	Above
Fairchild Air Force Base	none detected	7.9 ppt	5 of 29	Above
Washougal City of	none detected	7.9 ppt	3 of 29	Above
Deer Park City of	none detected	7.5 ppt	3 of 29	Above
Spokane City of	none detected	6.1 ppt	4 of 29	Above
Lakewood Water District	none detected	5.9 ppt	5 of 29	Above
Centralia Public Works - Water	none detected	5.8 ppt	2 of 29	Above
Olympia City of	4.3 ppt	5.8 ppt	5 of 29	Above
West Sound Utility District #1	5.7 ppt	none detected	4 of 29	Above
East Spokane Water Dist 1	none detected	5.5 ppt	1 of 29	Above
JBLM McChord Field	none detected	5.3 ppt	2 of 29	Above
Model Irrigation Dist #18	4.2 ppt	5.3 ppt	5 of 29	Above
Redmond Water System City of	none detected	5 ppt	2 of 29	Above
Northwest Water Assoc. Inc.	4.7 ppt	none detected	2 of 29	Above
Whitworth Water District 2	none detected	4.6 ppt	4 of 29	Above
Medical Lake City of	none detected	4.4 ppt	2 of 29	Above
Lakehaven Water and Sewer District	none detected	4.1 ppt	6 of 29	Above
Fruitland Mutual Water Company	4 ppt	none detected	4 of 29	Within
Aberdeen City of	none detected	none detected	0 of 29	Within
Airway Heights City of	none detected	none detected	4 of 29	Within
Alderwood Water District	none detected	none detected	0 of 29	Within
Anacortes City of	none detected	none detected	0 of 29	Within
Arlington Water Dept	none detected	none detected	1 of 29	Within
Auburn City of	none detected	none detected	1 of 29	Within
Bainbridge Island City of	none detected	none detected	0 of 29	Within
Battle Ground Water Dept City of	none detected	none detected	0 of 29	Within
Bayshore	none detected	none detected	0 of 29	Within
Beacon Hill Water & Sewer District	none detected	none detected	0 of 29	Within
Bellevue City of	none detected	none detected	0 of 29	Within
Bellingham-water Division City of	none detected	none detected	0 of 29	Within
Birch Bay Water & Sewer District	none detected	none detected	0 of 29	Within
Blaine City of	none detected	none detected	0 of 29	Within
Bonney Lake Water Department City	none detected	none detected	1 of 29	Within
Bothell Water City of	none detected	none detected	0 of 29	Within
Bremerton City of	none detected	none detected	1 of 29	Within
Buckley Water	none detected	none detected	0 of 29	Within
Castle Rock Municipal Water	none detected	none detected	0 of 29	Within
Cedar Grove Mobile Park	none detected	none detected	0 of 29	Within
Cedar River Water & Sewer District	none detected	none detected	1 of 29	Within
Chehalis Water Department	none detected	none detected	0 of 29	Within
Chelan Co Pud 1	none detected	none detected	0 of 29	Within
Chelan Water Dept City of	none detected	none detected	0 of 29	Within
Cheney City of	none detected	none detected	0 of 29	Within
Coal Creek Utility District	none detected	none detected	0 of 29	Within
Colfax Water Department City of	none detected	none detected	0 of 29	Within
College Place Water Dept	none detected	none detected	0 of 29	Within
Columbia Valley Water District	none detected	none detected	0 of 29	Within
Colville Water Department	none detected	none detected	0 of 29	Within
Connell City of	none detected	none detected	0 of 29	Within
Consolidated Irrig Dist 19 System 1	none detected	none detected	0 of 29	Within
Consolidated Irrig Dist 19 System 2	none detected	none detected	0 of 29	Within
Consolidated Support Services	none detected	none detected	0 of 29	Within
Crescent Water Assn	none detected	none detected	0 of 29	Within
Cross Valley Water District	none detected	none detected	3 of 29	Within
Crystal Mountain Inc	none detected	none detected	0 of 29	Within
Dungeness Meadows	none detected	none detected	0 of 29	Within
Dupont Water System City of	none detected	none detected	0 of 29	Within
Duvall City of	none detected	none detected	0 of 29	Within
East Wenatchee Water District	none detected	none detected	0 of 29	Within
Eastern Washington University	none detected	none detected	0 of 29	Within
Eastsound Water Users Association	none detected	none detected	0 of 29	Within
Eatonville Water Dept	none detected	none detected	0 of 29	Within
Edmonds City of	none detected	none detected	0 of 29	Within
Ellensburg Water Dept	none detected	none detected	0 of 29	Within
Elma, City of	none detected	none detected	0 of 29	Within
Emerald Lake	none detected	none detected	0 of 29	Within
Energy Dept Of/200w	none detected	none detected	0 of 29	Within
Enumclaw Water Department	none detected	none detected	0 of 29	Within
Ephrata Water Department	none detected	none detected	0 of 29	Within
Everett Public Works Dept. City of	none detected	none detected	0 of 29	Within
Everson City of	none detected	none detected	0 of 29	Within
Ferndale Wa	none detected	none detected	0 of 29	Within
Fife Dept of Public Works	none detected	none detected	2 of 29	Within
Fircrest City of	none detected	none detected	1 of 29	Within
Forks Municipal Water Dept	none detected	none detected	0 of 29	Within
Friday Harbor Town of	none detected	none detected	0 of 29	Within
Gig Harbor Water Dept	none detected	none detected	0 of 29	Within
Gold Bar City of	none detected	none detected	0 of 29	Within
Goldendale City of	none detected	none detected	0 of 29	Within
Grandview City of	none detected	none detected	0 of 29	Within
Granger Water Department	none detected	none detected	0 of 29	Within
Granite Falls City of	none detected	none detected	0 of 29	Within
Grays Harbor Co Water Dist 2	none detected	none detected	0 of 29	Within
Harrington City of	none detected	none detected	0 of 29	Within
Heights Water	none detected	none detected	0 of 29	Within
Hi Valley View	none detected	none detected	0 of 29	Within
Highline Water District	none detected	none detected	0 of 29	Within
Hoquiam Water Department	none detected	none detected	0 of 29	Within
Horizons West	none detected	none detected	1 of 29	Within
Irvin Water District #6	none detected	none detected	1 of 29	Within
Issaquah Water System	none detected	none detected	0 of 29	Within
Kalama City of	none detected	none detected	0 of 29	Within
Kelso City of	none detected	none detected	0 of 29	Within
Kent Water Department	none detected	none detected	1 of 29	Within
King County Water District #125	none detected	none detected	0 of 29	Within
King County Water District #20	none detected	none detected	0 of 29	Within
King County Water District #49	none detected	none detected	0 of 29	Within
King County Water District #54	none detected	none detected	0 of 29	Within
King County Water District 119	none detected	none detected	0 of 29	Within
King County Water District No 90	none detected	none detected	0 of 29	Within
Kirkland City of	none detected	none detected	0 of 29	Within
Lacey Water Department	none detected	none detected	4 of 29	Within
Lake Chelan Reclamation District	none detected	none detected	0 of 29	Within
Lake Cushman System 5	none detected	none detected	2 of 29	Within
Lake Forest Park Water District	none detected	none detected	0 of 29	Within
Lake Meridian Water District	none detected	none detected	0 of 29	Within
Liberty Lake Sewer & Water District	none detected	none detected	1 of 29	Within
Long Beach Water Department	none detected	none detected	0 of 29	Within
Longmire	none detected	none detected	0 of 29	Within
Longview Water Department	none detected	none detected	0 of 29	Within
Lost Lake Property Owners Assn	none detected	none detected	0 of 29	Within
Lwwsd - South Shore Water System	none detected	none detected	0 of 29	Within
Lynden Water Department	none detected	none detected	0 of 29	Within
Lynnwood City of	none detected	none detected	0 of 29	Within
Manchester Water District	none detected	none detected	0 of 29	Within
Marysville Utilities	none detected	none detected	0 of 29	Within
Mattawa City of	none detected	none detected	0 of 29	Within
Mccormick Woods	none detected	none detected	0 of 29	Within
Mercer Island City of	none detected	none detected	0 of 29	Within
Milton City of	none detected	none detected	4 of 29	Within
Minterbrook	none detected	none detected	3 of 29	Within
Modern Electric Water Co	none detected	none detected	0 of 29	Within
Monroe Water System, Wa	none detected	none detected	0 of 29	Within
Montesano City of	none detected	none detected	0 of 29	Within
Mountain View-edgewood Water Co	none detected	none detected	1 of 29	Within
Mountlake Terrace City of	none detected	none detected	0 of 29	Within
Moxee Water Department	none detected	none detected	0 of 29	Within
Mukilteo Water & Wastewater Distr	none detected	none detected	0 of 29	Within
Naches Town of	none detected	none detected	0 of 29	Within
Naval Air Station/whidbey Island	none detected	none detected	0 of 29	Within
Naval Base Kitsap at Bangor	none detected	none detected	0 of 29	Within
Naval Base Kitsap at Bremerton	none detected	none detected	0 of 29	Within
NE Sammamish Sewer & Water District	none detected	none detected	0 of 29	Within
Nob Hill Water Association	none detected	none detected	0 of 29	Within
North Bainbridge Water Co	none detected	none detected	0 of 29	Within
North Beach Water	none detected	none detected	0 of 29	Within
North Bend, City of	none detected	none detected	0 of 29	Within
North City Water District	none detected	none detected	0 of 29	Within
North Peninsula	none detected	none detected	0 of 29	Within
North Perry Ave Water District	none detected	none detected	0 of 29	Within
Northshore Utility District	none detected	none detected	0 of 29	Within
Northwest Trek	none detected	none detected	0 of 29	Within
Oak Harbor City of	none detected	none detected	0 of 29	Within
Ocean Shores Water Dept	none detected	none detected	0 of 29	Within
Olympic View Water & Sewer District	none detected	none detected	0 of 29	Within
Omak City of	none detected	none detected	1 of 29	Within
Orchard Avenue Irrigation Dist 6	none detected	none detected	0 of 29	Within
Orting City of	none detected	none detected	0 of 29	Within
Othello Water Department	none detected	none detected	0 of 29	Within
Pacific, City of	none detected	none detected	1 of 29	Within
Parkview Terrace	none detected	none detected	1 of 29	Within
Pasadena Park Irr Dist 17	none detected	none detected	0 of 29	Within
Pasco Water Department	none detected	none detected	0 of 29	Within
Pattison	none detected	none detected	0 of 29	Within
Peacock Hill	none detected	none detected	7 of 29	Within
Point Evans	none detected	none detected	0 of 29	Within
Port Angeles City of	none detected	none detected	0 of 29	Within
Port Angeles Composite	none detected	none detected	1 of 29	Within
Port of Seattle/seatac Airport	none detected	none detected	0 of 29	Within
Port Orchard Water	none detected	none detected	0 of 29	Within
Port Townsend City of	none detected	none detected	0 of 29	Within
Poulsbo City of	none detected	none detected	0 of 29	Within
Prosser City of	none detected	none detected	0 of 29	Within
Pud #1 of Asotin County	none detected	none detected	0 of 29	Within
Pullman Water Department City of	none detected	none detected	0 of 29	Within
Puyallup City of	none detected	none detected	1 of 29	Within
Quimper	none detected	none detected	1 of 29	Within
Quincy Water Department City of	none detected	none detected	0 of 29	Within
Raymond Water Department	none detected	none detected	0 of 29	Within
Renton City of	none detected	none detected	1 of 29	Within
Ridgefield Public Works	none detected	none detected	0 of 29	Within
Rogers Group Properties I LLC	none detected	none detected	0 of 29	Within
Sallal Water Association Inc	none detected	none detected	0 of 29	Within
Seabeck	none detected	none detected	0 of 29	Within
Seascape Water Association	none detected	none detected	0 of 29	Within
Seattle Public Utilities	none detected	none detected	0 of 29	Within
Selah City of	none detected	none detected	0 of 29	Within
Sequim City of	none detected	none detected	1 of 29	Within
Seven Lakes Water Association	none detected	none detected	0 of 29	Within
Shelter Bay Community Inc	none detected	none detected	0 of 29	Within
Shelton City of	none detected	none detected	0 of 29	Within
Silver Lake Water & Sewer District	none detected	none detected	0 of 29	Within
Silverdale Water Dist 16	none detected	none detected	0 of 29	Within
Skagit County Pud 1 Judy Res	none detected	none detected	1 of 29	Within
Skyway Water & Sewer	none detected	none detected	0 of 29	Within
Snake River Housing Water System	none detected	none detected	0 of 29	Within
Sno Pud 1 - Lake Stevens	none detected	none detected	0 of 29	Within
Snohomish City of	none detected	none detected	0 of 29	Within
Snoqualmie Pass Utility District	none detected	none detected	0 of 29	Within
Snoqualmie Water	none detected	none detected	0 of 29	Within
Soos Creek Water & Sewer District	none detected	none detected	0 of 29	Within
Spo Co Water Dist 3 Sys 2	none detected	none detected	0 of 29	Within
Spo Co Water Dist 3 Sys 3	none detected	none detected	0 of 29	Within
Spo Co Water Dist 3 Sys 4	none detected	none detected	0 of 29	Within
Spokane Business & Industrial Park	none detected	none detected	0 of 29	Within
Stanwood Water Dept City of	none detected	none detected	0 of 29	Within
Steilacoom Town of	none detected	none detected	0 of 29	Within
Stevens Co Pud - Suncrest	none detected	none detected	2 of 29	Within
Stevens Co Pud - Valley	none detected	none detected	0 of 29	Within
Stevens Pass Water System	none detected	none detected	0 of 29	Within
Sultan Water Department	none detected	none detected	0 of 29	Within
Summit Water & Supply Co	none detected	none detected	1 of 29	Within
Sumner City of	none detected	none detected	0 of 29	Within
Sunnyside City of	none detected	none detected	0 of 29	Within
Suquamish	none detected	none detected	0 of 29	Within
Tacoma Water Division City of	none detected	none detected	2 of 29	Within
Tanglewilde-Thompson Place 600	none detected	none detected	0 of 29	Within
Tenino City of	none detected	none detected	0 of 29	Within
Toppenish Water Department	none detected	none detected	0 of 29	Within
Tukwila Water Department	none detected	none detected	0 of 29	Within
Tumwater City of	none detected	none detected	1 of 29	Within
Union Gap Water	none detected	none detected	0 of 29	Within
Union Hill Water Association Inc	none detected	none detected	0 of 29	Within
Vera Water & Power	none detected	none detected	0 of 29	Within
Vinland	none detected	none detected	0 of 29	Within
Walla Walla Water Division	none detected	none detected	0 of 29	Within
Wapato Waterworks	none detected	none detected	0 of 29	Within
Warden City of	none detected	none detected	0 of 29	Within
Washington State University	none detected	none detected	0 of 29	Within
Water District 19	none detected	none detected	0 of 29	Within
Wenatchee City of	none detected	none detected	0 of 29	Within
West Richland City of	none detected	none detected	0 of 29	Within
West Sequim Bay Inc	none detected	none detected	0 of 29	Within
Westport Water Department	none detected	none detected	0 of 29	Within
Whatcom County Water Dist 13	none detected	none detected	0 of 29	Within
White Salmon City of	none detected	none detected	0 of 29	Within
Woodinville Water District	none detected	none detected	0 of 29	Within
Woodland City of	none detected	none detected	1 of 29	Within
Yak Co - Terrace Heights	none detected	none detected	0 of 29	Within
Yakima Water Division City of	none detected	none detected	0 of 29	Within
Yelm City of	none detected	none detected	0 of 29	Within

All 248 systems the EPA tested in Washington, every one of them with its own page. Each was tested for 29 PFAS compounds.

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Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →