Overview

EWG's drinking water quality report for Washington shows results of tests conducted by the water utilities in Washington and provided to EWG by the Washington State Department of Health.

LARGE UTILITIES

ALL UTILITIES WITH VIOLATIONS

LARGE UTILITIES WITH VIOLATIONS

Large utilities in Washington

Below are utilities in Washington serving over 10,000 people, listed alphabetically.

Utility	Location	People Served

Alderwood Water District	Lynnwood, WA	197,993
Arlington Water Department	Arlington, WA	19,690
Bainbridge Island City Of	Bainbridge Island, WA	12,429
Battle Ground Water Department	Battle Ground, WA	28,864
Beacon Hill Water & Sewer District	Kelso, WA	11,457
Bonney Lake Water Department	Buckley, WA	38,307
Camas Municipal Water Sewer System	Camas, WA	31,794
Cedar River Water & Sewer District	Maple Valley, WA	28,671
Centralia Utilities	Centralia, WA	28,164
Chehalis Water Department	Chehalis, WA	11,426
Chelan County PUD 1	Wenatchee, WA	15,840
Cheney, City of	Cheney, WA	14,621
City of Aberdeen	Aberdeen, WA	17,958
City of Anacortes	Mount Vernon, WA	21,105
City of Auburn	Auburn, WA	113,921
City of Bellevue	Bellevue, WA	261,506
City of Bellingham Water Division	Bellingham, WA	135,023
City of Bothell Water	Bothell, WA	32,712
City of Bremerton	Bremerton, WA	72,520
City of Edmonds	Edmonds, WA	34,023
City of Everett Public Works Department	Everett, WA	215,774
City of Grandview	Grandview, WA	11,010
City of Kelso	Kelso, WA	15,097
City of Kennewick	Kennewick, WA	89,224
City of Kirkland	Kirkland, WA	64,795
City of Lynnwood	Lynnwood, WA	63,204
City of Mercer Island	Mercer Island, WA	25,748
City of Moses Lake	Moses Lake, WA	32,428
City of Mountlake Terrace	Mountlake Terrace, WA	26,402
City of Oak Harbor	Oak Harbor, WA	23,587
City of Olympia	Olympia, WA	113,584
City of Port Angeles	Port Angeles, WA	28,946
City of Pullman Water Department	Pullman, WA	29,690
City of Puyallup	Puyallup, WA	36,906
City of Redmond Water System	Redmond, WA	123,565
City of Renton	Renton, WA	107,119
City of Richland	Richland, WA	94,463
City of Spokane	Spokane, WA	343,167
City of Sunnyside	Sunnyside, WA	17,037
City of Tacoma	Tacoma, WA	448,771
City of Tumwater	Tumwater, WA	66,373
City of Vancouver	Vancouver, WA	373,047
City of Washougal	Washougal, WA	19,783
City of Wenatchee	Wenatchee, WA	31,045
City of West Richland	West Richland, WA	17,410
City of Yakima Water Division	Yakima, WA	110,598
Clark Public Utilities	Vancouver, WA	116,876
Coal Creek Utility District	Newcastle, WA	14,194
Consolidated Irrig District 19 System 2	Greenacres, WA	21,220
Covington Water District	Kent, WA	52,143
Cross Valley Water District	Snohomish, WA	22,932
Dupont Water System City Of	Dupont, WA	12,860
Duvall City Of	Duvall, WA	10,017
East Wenatchee Water District	East Wenatchee, WA	26,519
Eastern Washington University	Cheney, WA	17,108
Ellensburg Water Department	Ellensburg, WA	20,900
Enumclaw Water Department	Enumclaw, WA	17,242
Ferndale	Ferndale, WA	18,170
Fife Department Of Public Works	Fife, WA	32,380
Firgrove Mutual Inc	Puyallup, WA	36,055
Fruitland Mutual Water Company	Puyallup, WA	15,258
Gig Harbor Water Department	Gig Harbor, WA	14,902
Highline Water District	Kent, WA	115,057
Hoquiam Water Department	Hoquiam, WA	11,456
Issaquah Water System	Issaquah, WA	39,578
JBLM Lewis	Joint Base Lewis-mcchord, WA	58,497
Jblm Mcchord Field	Joint Base Lewis-mcchord, WA	13,115
Kent Water Department	Kent, WA	157,101
King County Water District #125	Seattle, WA	17,546
King County Water District #20	Seattle, WA	38,974
King County Water District #49	Burien, WA	16,065
King County Water District 111	Kent, WA	23,619
King County Water District No 90	Renton, WA	20,100
Lacey Water Department	Lacey, WA	85,727
Lakehaven Utility District	Federal Way, WA	116,906
Lakewood Water District	Lakewood, WA	62,089
Liberty Lake Sewer & Water District	Liberty Lake, WA	11,485
Longview Water Department	Longview, WA	49,111
Lwwsd - South Shore Water System	Bellingham, WA	10,028
Lynden Water Department	Lynden, WA	17,458
Manchester Water District	Manchester, WA	10,437
Marysville Utilities	Marysville, WA	72,380
Modern Electric Water Company	Spokane, WA	18,487
Monroe Water System	Monroe, WA	24,077
Mukilteo Water & Wastewater District	Mukilteo, WA	24,428
Naval Air Station/whidbey Island	Oak Harbor, WA	16,595
Naval Base Kitsap At Bangor	Silverdale, WA	16,828
Naval Base Kitsap At Bremerton	Silverdale, WA	12,078
Nob Hill Water Association	Yakima, WA	35,785
North City Water District	Shoreline, WA	31,323
North Peninsula	Poulsbo, WA	16,449
North Perry Ave Water District	Bremerton, WA	23,932
Northshore Utility District	Kenmore, WA	104,722
Olympic View Water & Sewer District	Edmonds, WA	16,403
Orting City Of	Orting, WA	10,332
Parkland Light & Water Company	Tacoma, WA	29,595
Pasco Water Department	Pasco, WA	109,345
Port Angeles Composite	Carlsborg, WA	11,248
Port Orchard Water Department	Port Orchard, WA	15,810
Port Townsend City Of	Port Townsend, WA	16,790
Poulsbo City Of	Poulsbo, WA	17,180
PUD #1 of Asotin County	Clarkston, WA	22,583
Quimper	Port Townsend, WA	14,500
Ridgefield Public Works	Ridgefield, WA	19,670
Sammamish Plateau Water and Sewer	Sammamish, WA	65,598
Seattle Public Utilities	Seattle, WA	1,091,904
Selah City Of	Selah, WA	12,515
Sequim City Of	Sequim, WA	14,293
Shelton City Of	Shelton, WA	17,645
Silverdale Water District 16	Silverdale, WA	26,634
Skagit County Public Utility District 1 Judy Reservoir	Mount Vernon, WA	116,371
Skyway Water & Sewer	Seattle, WA	11,710
SNO PUD 1 - Lake Stevens	Everett, WA	59,146
Snohomish City Of	Snohomish, WA	11,258
Snoqualmie Water	Snoqualime, WA	15,848
Soos Creek Water and Sewer District	Renton, WA	64,534
Southwood Water System	Tacoma, WA	64,276
Spanaway Water Company	Spanaway, WA	31,260
Spokane County Water District 3, Sys 2	Spokane, WA	18,650
Stanwood Water Department City Of	Stanwood, WA	13,785
Summit Water & Supply Company	Tacoma, WA	16,000
Sumner City Of	Sumner, WA	15,530
Tukwila Water Department	Tukwila, WA	45,374
Union Hill Water Association Inc.	Redmond, WA	11,360
Vera Water & Power	Spokane Valley, WA	24,692
Walla Walla Water Division	Walla Walla, WA	42,959
Washington State University	Pullman, WA	25,824
West Sound Utility District #1	Port Orchard, WA	28,721
Whitworth Water District 2	Mead, WA	26,883
Woodinville Water District	Woodinville, WA	59,873
Woodland City Of	Woodland, WA	10,640
Yelm City Of	Yelm, WA	16,633

Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Washington

The Environmental Protection Agency's Enforcement and Compliance History Online (ECHO) database collects compliance and enforcement-related information for drinking water utilities nationwide. ECHO water quality violation scores take into account federal health-based water quality standards, as well as monitoring, reporting and other drinking water quality requirements. Points are accrued based on specific problems at the utility - violations of health-based drinking water standards receive more points than monitoring and reporting violations - and the length of time until the violations were corrected.

Utility	Location	People Served	Violation Points

Trails West Subdivision	, WA	27	111
Cape San Juan Water District	Friday Harbor, WA	158	66
Orient Water Company	Republic, WA	167	66
Spring Point Homeowners Association	Deer Harbor, WA	108	60
Marble Water System	Northport, WA	94	56
Arrowhead Beach Co-op Water Association	Mount Vernon, WA	168	50
Mcneil Island Water	Tumwater, WA	692	50
Ridgeview Estates Community Association	Freeland, WA	75	45
Lisecc	Lummi Island, WA	357	40
Beverly Beach Improvement Club	Mount Vernon, WA	56	40
Delta Water Association	Lynden, WA	450	40
Penn Cove Water and Sewer District	Coupeville, WA	460	35
Badger Mountain Irrigation District	Kennewick, WA	2,295	35
Saratoga Water District	Coupeville, WA	458	35
Bonnie View Water	Coupeville, WA	44	31
Holden Village	Chelan, WA	228	31
White Salmon City Of	White Salmon, WA	3,930	30
Campbells Glen	Coupeville, WA	62	26
Beachwood Water Company	Coupeville, WA	90	26
Township 29 Water Association	Mount Vernon, WA	42	25
Maple Hill Park	Coupeville, WA	35	22
Long Beach Water Department	Long Beach, WA	4,052	20
Salkum Water Supply	Salkum, WA	103	20
Metaline Water Department	Metaline, WA	193	20
Sierra Country Club	Coupeville, WA	355	17
Rolling Hills-glencairn	Coupeville, WA	871	17
Eastgate	Coupeville, WA	76	17
Mesa Water Department	Mesa, WA	495	16
Sage Hills Second Water System	Warden, WA	34	15
Devries Road Community Association	Coupeville, WA	76	15

Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Washington

Utility	Location	People Served	Violation Points

Walla Walla Water Division	Walla Walla, WA	42,959	7
Orting City Of	Orting, WA	10,332	5
City of Sunnyside	Sunnyside, WA	17,037	2
Longview Water Department	Longview, WA	49,111	2
City of Grandview	Grandview, WA	11,010	1
Dupont Water System City Of	Dupont, WA	12,860	1
Quimper	Port Townsend, WA	14,500	1
Monroe Water System	Monroe, WA	24,077	1
Whitworth Water District 2	Mead, WA	26,883	1
City of Pullman Water Department	Pullman, WA	29,690	1
SNO PUD 1 - Lake Stevens	Everett, WA	59,146	1
Lacey Water Department	Lacey, WA	85,727	1

Contaminants found in Washington above health guidelines

	Found above health guidelines		Found
Contaminant	# of Utilities	People Served	# of Utilities	People Served

Total trihalomethanes (TTHMs)	1,037	8,315,354	1,044	8,345,045
Bromodichloromethane	843	8,065,709	873	8,208,472
Haloacetic acids (HAA5)	655	7,498,520	656	7,513,141
Haloacetic acids (HAA9)	184	7,410,607	186	7,449,994
Chromium (hexavalent)	189	7,310,987	195	7,452,780
Chloroform	625	6,965,871	868	8,144,938
Dichloroacetic acid	517	6,591,492	538	6,871,205
Trichloroacetic acid	463	6,516,152	473	6,638,419
Nitrate	1,198	4,268,053	1,526	6,958,078
Dibromochloromethane	717	4,265,433	794	5,950,932
Radium, combined (-226 & -228)	918	3,921,013	1,068	4,231,185
Arsenic	727	3,675,596	727	3,675,596
Nitrate & nitrite	555	3,073,362	637	3,740,347
Bromochloroacetic acid	168	2,610,017	174	2,832,969
Total PFOS and PFOA	157	2,175,003	157	2,175,003
Perfluorooctanoic acid (PFOA)	123	2,046,751	126	2,081,330
Perfluorooctane sulfonate (PFOS)	126	1,720,892	137	2,363,011
Perfluorohexane sulfonate (PFHXS)	101	1,604,913	101	1,604,913
Bromate	18	1,592,823	26	2,307,634
Dibromoacetic acid	247	1,559,254	255	1,957,340
Bromoform	244	573,686	481	3,675,350
Radon	3	344,595	3	344,595
Perfluorononanoic acid (PFNA)	9	242,129	9	242,129
Chlorite	3	117,464	3	117,464
Manganese	72	37,648	1,119	7,847,249
Thallium	21	25,779	30	167,232
Uranium, combined (pCi/L)	46	23,557	68	28,615
Bromochloromethane	3	11,770	5	24,930
Perfluoropentane sulfonic acid (PFPeS)	13	8,950	30	324,174
Cadmium	4	5,484	5	22,894
Perfluorodecanoic acid (PFDA)	1	5,045	1	5,045
Ethylene dibromide	1	4,674	1	4,674
Antimony	3	3,377	26	392,221
Perfluoroundecanoic acid (PFUnA)	1	1,214	1	1,214
Carbon tetrachloride	2	883	2	883
Tetrachloroethylene (perchloroethylene)	2	458	2	458
6:2 Fluorotelomer sulfonate (6:2FTS)	2	383	4	7,584
Trichloroethylene	1	293	15	776,346
Perfluoroheptane sulfonic acid (PFHpS)	2	196	2	196
Benzene	1	195	1	195
Chloromethane	1	182	53	211,419

Contaminants found in Washington above legal limits

Contaminant	# of Utilities	People Served

Arsenic	13	5,936
Cadmium	1	5,305
Total trihalomethanes (TTHMs)	10	1,597
Haloacetic acids (HAA5)	5	915
Nitrate	4	573
Nitrate and nitrite	1	527
Uranium	4	451
Fluoride	1	108

EWG’s Tap
Water Database

Nitrate in
Tap Water

STATE

Washington

CONTAMINANTS

121

serves

8,870,000

data

2013-2024

UTILITIES

2,312

Overview

Large utilities in Washington

Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Washington

Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Washington

Contaminants found in Washington above health guidelines

Contaminants found in Washington above legal limits

What filter type is right for you?

Water
Contaminants

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Reverse Osmosis

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EWG’s TapWater Database

STATE

Washington

CONTAMINANTS

121

serves

8,870,000

data

2013-2024

UTILITIES

2,312

Overview

Large utilities in Washington

Utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Washington

Large utilities that accumulated/accrued the most violation points as of July 2021 to June 2024 in Washington

Contaminants found in Washington above health guidelines

Contaminants found in Washington above legal limits

What filter type is right for you?

WaterContaminants

Carbon Filters

Reverse Osmosis

Other Considerations

Ion Exchange

Whole-House Filters

Distillation

Take Action

Need help finding a filter?

We’re in this together

Protect your water

EWG’s Tap
Water Database

Water
Contaminants