Washington tap water, by utility.

261 utilities with a full report, serving 8.9 million people as they report it. Regulated PFAS turned up at 58 of them.

Washington utilities by population served
Utility	Based in	Serves	Regulated PFAS	Health-based violations since 2016
Seattle Public Utilities	Seattle	1,161,961	None found	0
City of Tacoma Water Division	Tacoma	446,170	PFHxS, PFBS	0
City of Vancouver	Vancouver	373,047	PFOA, PFOS, PFHxS, PFBS	0
City of Spokane	Spokane	346,138	PFOS, PFBS	0
City of Bellevue	Bellevue	321,349	None found	0
Alderwood Water District	Lynnwood	245,715	None found	0
City of Everett Public Works Dept.	Everett	215,774	None found	0
Kent Water Department	Kent	166,421	PFBS	0
City of Redmond Water System	Redmond	163,335	PFOS, PFBS	0
Clark Public Utilities	Vancouver	153,526	PFOA, PFOS, PFHxS, PFBS	0
Lakehaven Water and Sewer District	Federal Way	148,809	PFOS, PFHxS, PFBS	0
City of Bellingham - Water Division	Bellingham	141,127	None found	0
City of Olympia	Olympia	126,966	PFOA, PFOS, PFBS	0
City of Kennewick	Kennewick	118,164	PFOA, PFOS, PFHxS, PFBS	0
Pasco Water Department	Pasco	115,102	None found	0
City of Yakima Water Division	Yakima	112,858	None found	0
Skagit County PUD 1 Judy Res	Mount Vernon	111,415	None found	0
City of Renton	Renton	108,091	PFBS	0
City of Auburn	Auburn	107,655	PFBS	0
City of Richland	Richland	106,499	PFOA, PFOS, PFHxS, PFBS	0
Lacey Water Department	Lacey	105,178	PFHxS, PFBS	0
Highline Water District	Kent	100,170	None found	0
Northshore Utility District	Kenmore	99,789	None found	0
City of Puyallup	Puyallup	94,520	PFBS	0
Marysville Utilities	Marysville	88,582	None found	0
Lakewood Water District	Lakewood	82,425	PFOS, PFHxS, PFBS	0
Sammamish Plateau Water & Sewer	Sammamish	79,362	PFOS, PFHxS, PFBS	0
Soos Creek Water & Sewer District	Renton	74,172	None found	0
City of Bremerton	Bremerton	72,951	PFBS	0
City of Kirkland	Kirkland	69,243	None found	0
City of Lynnwood	Lynnwood	68,204	None found	0
Sno PUD 1 - Lake Stevens	Everett	67,710	None found	0
Woodinville Water District	Woodinville	66,699	None found	0
Silver Lake Water & Sewer District	Bothell	65,033	None found	0
Southwood	Tacoma	64,155	PFOA, PFOS, PFBS	0
Longview Water Department	Longview	57,617	None found	0
Covington Water District	Kent	56,172	PFOS, PFHxS, PFBS	0
City of Tumwater	Tumwater	51,802	PFBS	0
King County Water District #20	Seattle	48,469	None found	0
City of Wenatchee	Wenatchee	43,690	None found	0
Issaquah Water System	Issaquah	43,584	None found	0
Bonney Lake Water Department City	Buckley	43,371	PFBS	0
Walla Walla Water Division	Walla Walla	42,959	None found	36
Nob Hill Water Association	Yakima	38,050	None found	0
Tukwila Water Department	Tukwila	36,298	None found	0
Firgrove Mutual Inc	Puyallup	36,168	PFOA, PFOS, PFBS	0
Jblm Lewis	Joint Base Lewis - McChord	35,414	PFOA, PFOS, PFHxS, PFBS	0
Silverdale Water Dist 16	Silverdale	35,163	None found	0
Spanaway Water Company	Spanaway	34,506	PFOA, PFOS, PFHxS, PFBS	0
City of Edmonds	Edmonds	34,065	None found	0
Parkland Light & Water Company	Tacoma	33,775	PFOA, PFOS, PFHxS, PFBS	0
City of Bothell Water	Bothell	33,643	None found	0
North City Water District	Shoreline	32,847	None found	0
City of Moses Lake	Moses Lake	32,428	PFOS, PFHxS, PFBS	0
Camas Municipal Water Sewer System	Camas	31,794	PFOA, PFOS, PFBS	0
Mukilteo Water & Wastewater Distr	Mukilteo	31,437	None found	0
City of Pullman Water Department	Pullman	31,315	None found	0
City of Mercer Island	Mercer Island	31,057	None found	0
City of Battle Ground Water Dept	Battle Ground	30,237	None found	0
City of Arlington	Arlington	29,508	PFHxS	0
Fife Dept of Public Works	Fife	29,091	PFHxS, PFBS	0
West Sound Utility District #1	Port Orchard	28,930	PFOA, PFHxS	0
Cedar River Water & Sewer District	Maple Valley	28,671	None found	0
Centralia Public Works - Water	Centralia	28,164	PFOS, PFBS	0
City of Port Angeles	Port Angeles	28,067	None found	0
Whitworth Water District 2	Mead	26,883	PFOS, PFBS	0
East Wenatchee Water District	East Wenatchee	26,519	None found	0
City of Mountlake Terrace	Mountlake Terrace	26,402	None found	0
City of Anacortes	Mount Vernon	25,109	None found	0
Cross Valley Water District	Snohomish	24,695	PFBS	0
Vera Water & Power	Spokane Valley	24,692	None found	0
North Perry Ave Water District	Bremerton	24,402	None found	0
Lake Meridian Water District	Kent	24,231	None found	0
City of Oak Harbor	Oak Harbor	23,675	None found	0
King County Water District #49	Burien	23,492	None found	0
Monroe Water System	Monroe	23,467	None found	0
Enumclaw Water Department	Enumclaw	23,276	None found	0
City of Aberdeen	Aberdeen	22,867	None found	0
PUD #1 of Asotin County	Clarkston	21,930	None found	0
King County Water District #125	Seattle	21,904	None found	0
Washington State University	Pullman	21,506	None found	0
City of Washougal	Washougal	21,441	PFOS, PFBS	0
City of West Richland	West Richland	21,231	None found	0
Ridgefield Public Works	Ridgefield	21,225	None found	0
Consolidated Irrig Dist 19 System 2	Greenacres	21,220	None found	0
Ellensburg Water Dept	Ellensburg	20,900	None found	0
Snoqualmie Water	Snoqualime	20,222	None found	0
King County Water District No 90	Renton	20,100	None found	0
Lynden Water Department	Lynden	20,062	None found	1
Ferndale	Ferndale	19,305	None found	0
Summit Water & Supply Co	Tacoma	19,125	None found	0
Spo Co Water Dist 3 Sys 1	Spokane	19,035	None found	0
Modern Electric Water Co	Spokane	18,487	None found	0
City of Poulsbo	Poulsbo	18,400	None found	0
Olympic View Water & Sewer District	Edmonds	17,784	None found	0
City of Stanwood Water Dept	Stanwood	17,586	None found	0
City of Yelm	Yelm	17,355	None found	0
City of Sunnyside	Sunnyside	17,194	None found	0
Eastern Washington University	Cheney	17,108	None found	0
City of Port Townsend	Port Townsend	17,053	None found	0
City of Cheney	Cheney	16,954	None found	0
Naval Base Kitsap at Bangor	Silverdale	16,828	None found	0
Naval Air Station/Whidbey Island	NAS Whidbey Island	16,595	None found	0
Gig Harbor Water Dept	Gig Harbor	16,510	None found	0
North Peninsula	Poulsbo	16,449	None found	0
City of Sumner	Sumner	16,438	None found	0
City of Snohomish	Snohomish	16,367	None found	0
Chelan Co PUD 1	Wenatchee	16,190	None found	0
Coal Creek Utility District	Newcastle	15,989	None found	0
City of Kelso	Kelso	15,775	None found	0
Port Orchard Water Dept	Port Orchard	15,355	None found	0
Fruitland Mutual Water Company	Puyallup	15,313	PFOA, PFBS	0
City of Shelton	Shelton	15,089	None found	0
Quimper	Port Townsend	14,548	PFBS	0
Liberty Lake Sewer & Water District	Liberty Lake	14,500	PFBS	0
City of Sequim	Sequim	14,293	PFBS	0
City of Bainbridge Island	Bainbridge Island	13,491	None found	0
City of Dupont Water System	Dupont	13,141	None found	0
City of Prosser	Prosser	12,070	None found	0
Skyway Water & Sewer	Seattle	12,036	None found	0
Beacon Hill Water & Sewer District	Kelso	11,969	None found	0
Naval Base Kitsap at Bremerton	Silverdale	11,792	None found	1
Chehalis Water Department	Chehalis	11,718	None found	0
Hoquiam Water Department	Hoquiam	11,456	None found	0
City of Duvall	Duvall	11,050	None found	0
City of Leavenworth	Leavenworth	11,041	Not sampled	0
City of Grandview	Grandview	11,010	None found	1
City of Woodland	Woodland	10,640	None found	0
Manchester Water District	Manchester	10,475	None found	0
City of Orting	Orting	10,332	None found	0
Lwwsd - South Shore Water System	Bellingham	10,028	None found	0
NE Sammamish Sewer & Water District	Sammamish	9,702	None found	0
Mountain View - Edgewood Water Co	Edgewood	9,680	PFBS	0
Fairchild Air Force Base	Fairchild AFB	9,544	PFOS, PFHxS, PFBS	0
City of Airway Heights	Airway	9,489	PFHxS	0
Consolidated Irrig Dist 19 System 1	Greenacres	9,434	None found	0
City of Chelan Water Dept	Chelan	9,425	None found	0
Ocean Shores Water Dept	Hoquiam	9,347	None found	0
City of Selah	Selah	9,331	None found	1
Birch Bay Water & Sewer District	Birch Bay	9,046	None found	0
Toppenish Water Department	Toppenish	8,950	None found	0
Port Angeles Composite	Carlsborg	8,872	None found	0
Othello Water Department	Othello	8,755	None found	0
Union Hill Water Association Inc	Redmond	8,720	None found	0
Ephrata Water Department	Ephrata	8,718	None found	0
City of North Bend	North Bend	8,710	None found	0
Town of Steilacoom	Steilacoom	8,545	None found	0
Sultan Water Department	Sultan	8,424	None found	0
City of Quincy Water Department	Quincy	8,415	None found	0
Yak Co - Terrace Heights	Yakima	8,410	None found	1
College Place Water Dept	College Place	8,147	None found	0
North Beach Water	Ocean Park	8,093	None found	0
City of Milton	Milton	8,078	PFBS	0
City of Kalama	Kalama	8,020	None found	0
City of Fircrest	Fircrest	7,927	PFBS	0
City of Pacific	Othello	7,925	PFBS	0
Model Irrigation Dist #18	Spokane	7,903	PFOA, PFOS, PFBS	0
Tanglewilde Thompson Place 600	Lacey	7,900	None found	0
Buckley Water	Buckley	7,842	None found	0
Stevens Co PUD - Suncrest	Loon Lake	7,484	None found	0
Peacock Hill	Tacoma	7,401	PFHxS, PFBS	0
Jblm McChord Field	Joint Base Lewis - McChord	7,290	PFOS, PFHxS	0
Lake Chelan Reclamation District	Manson	6,798	None found	0
City of Elma	Elma	6,638	None found	0
Sallal Water Association Inc	North Bend	6,600	None found	0
Union Gap Water	Union Gap	6,433	None found	0
Black Diamond Water Dept	Black Diamond	6,407	Not sampled	0
City of Blaine	Blaine	6,319	None found	0
Pasadena Park Irr Dist 17	Spokane	6,269	None found	0
Spo Co Water Dist 3 Sys 4	Spokane	6,233	None found	0
City of Montesano	Montesano	6,204	None found	0
Tulalip Bay Water Dist #1	Marysville	5,968	None found	0
Snoqualmie Pass Utility District	Snoqualmie Pass	5,832	None found	0
Artondale	Tacoma	5,828	PFOA, PFOS, PFHxS, PFBS	0
Seven Lakes Water Association	Stanwood	5,823	None found	0
Cashmere Water Department	Cashmere	5,815	Not sampled	0
Benton City Water	Benton City	5,626	PFOS, PFHxS, PFBS	0
Moxee Water Department	Moxee	5,599	None found	0
North Bainbridge Water Co	Poulsbo	5,490	None found	0
City of Deer Park	Deer Park	5,435	PFOS, PFNA, PFBS	0
King County Water District #54	Kent	5,373	None found	1
City of Mattawa	Mattawa	5,370	None found	1
City of Granite Falls	Granite Falls	5,349	None found	0
Westport Water Department	Westport	5,346	None found	4
Water District 19	Vashon	5,335	None found	2
Wapato Waterworks	Wapato	5,255	None found	0
Point Evans	Tacoma	5,211	None found	0
City of Connell	Connell	5,150	None found	0
Grays Harbor Co Water Dist 2	Montesano	5,112	None found	0
Minterbrook	Tacoma	5,083	PFBS	0
City of Medical Lake	Medical Lake	4,982	PFOS, PFHxS	0
Colville Water Department	Colville	4,945	None found	0
City of Omak	Omak	4,940	None found	0
Vinland	Poulsbo	4,801	None found	0
Stevenson Water Dept	Stevenson	4,702	Not sampled	0
City of Warden	Warden	4,674	None found	1
Pattison 500	Lacey	4,643	None found	0
Long Beach Water Department	Long Beach	4,628	None found	4
Raymond Water Department	Raymond	4,620	None found	0
Belfair Water District 1	Belfair	4,432	Not sampled	0
South Bainbridge	Poulsbo	4,414	Not sampled	0
Castle Rock Municipal Water	Castle Rock	4,367	None found	0
Orchard Avenue Irrigation Dist 6	Spokane	4,330	None found	0
City of Goldendale	Goldendale	4,314	None found	0
East Spokane Water Dist 1	Spokane Valley	4,285	PFOS	0
Trentwood Irrigation District 3	Spokane	4,228	PFOA, PFOS, PFBS	0
Suquamish	Poulsbo	4,203	None found	0
Crystal Mountain Inc	Raymond	4,154	None found	0
Irvin Water District #6	Spokane	4,150	None found	0
Town of Coupeville	Coupeville	4,142	PFOA, PFHxS, PFBS	0
City of White Salmon	White Salmon	4,077	None found	4
Granger Water Department	Granger	3,993	None found	0
Eatonville Water Dept	Eatonville	3,945	None found	0
City of Everson	Everson	3,893	None found	0
City of Brewster	Brewster	3,843	Not sampled	0
City of Okanogan Water Department	Okanogan	3,817	Not sampled	0
King County Water District 119	Duvall	3,800	None found	0
Spo Co Water Dist 3 Sys 3	Spokane	3,768	None found	0
Grand Mound	Olympia	3,764	Not sampled	0
Parkview Terrace	Tacoma	3,730	PFBS	0
Eastsound Water Users Association	Eastsound	3,711	None found	1
Lummi Tribal Water District	Ferndale	3,699	None found	1
Lake Cushman System 5	Hoodsport	3,675	None found	0
Town of Friday Harbor	Friday Harbor	3,543	None found	0
Roosevelt Water Association	Snohomish	3,530	Not sampled	0
City of Zillah	Zillah	3,518	Not sampled	1
Town of Naches	Naches	3,512	None found	0
City of Colfax Water Department	Colfax	3,507	None found	0
City of Winlock	Winlock	3,502	Not sampled	0
Forks Municipal Water Dept	Forks	3,468	None found	0
Horizons West	Tacoma	3,454	None found	0
Royal City Water	Royal City	3,389	Not sampled	0
Dayton Water Department	Dayton	3,374	Not sampled	0
City of Tenino	Tenino	3,336	None found	0
City of Newport	Newport	3,331	Not sampled	0
Algona Water Dept	Algona	3,300	Not sampled	0
Lake Forest Park Water District	Lake Forest Park	3,171	None found	0
Snake River Housing Water System	Yakima	3,036	None found	0
McCormick Woods	Port Orchard	2,760	None found	0
West Sequim Bay Inc	Sequim	2,759	None found	0
City of Gold Bar	Goldbar	2,745	None found	0
Columbia Valley Water District	Maple Falls	2,648	None found	0
Crescent Water Assn	Joyce	2,360	None found	1
Shelter Bay Community Inc	La Conner	2,212	None found	0
Heights Water	Vashon	2,051	None found	0
Quistorff	Tacoma	1,113	PFOS, PFHxS, PFBS	0
Shoalwater Bay	Tokeland	898	None found	0
Whatcom County Water Dist 13	Maple Falls	795	None found	0
Lost Lake Property Owners Assn	Coupeville	736	None found	0
City of Harrington	Waverly	650	None found	0
Seabeck	Poulsbo	610	None found	0
Consolidated Support Services	Medical Lake	569	None found	0
Stevens Co PUD - Valley	Loon Lake	550	None found	0
MT. Vista - Dungeness Golf Course	Sequim	517	None found	0
Dungeness Meadows	Sequim	488	None found	0
Northwest Water Assoc. Inc.	Lynden	400	PFOA, PFBS	0
Emerald Lake	Shelton	331	None found	0
Bayshore	Union	130	None found	0
Hi Valley View	Yakima	67	None found	0
Cedar Grove Mobile Park	Sequim	40	None found	0
Seascape Water Association	Stanwood	28	None found	0
Utilities EPA sampled under UCMR 5, plus any other community system serving 3,300 people or more. Smaller systems appear in ZIP code results. Data: EPA SDWIS 2026 Q2 and UCMR 5.