Arsenic violations in Washington
78 active public water systems in Washington had a Arsenic violation in the past three years, 10 of them in the latest quarter of EPA's data. What Arsenic is and why it matters.
Systems with a Arsenic violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
River Rock Tobacco and Fuel Arlington · County |
2,117 | 4 | 1 | |
|
Miracle Ranch Kitsap County |
418 | 1 | 0 | |
|
Martha Boardman Wellpinit · County |
295 | 6 | 0 | |
|
Whidbey Shores Water System Island County |
262 | 2 | 0 | |
|
Panorama Place Water Assn Yakima County |
220 | 1 | 0 | |
|
River Road Mobile Home Park Okanogan County |
150 | 1 | 0 | |
|
Eastgate Island County |
76 | 2 | 0 | |
|
Campbells Glen Island County |
62 | 6 | 1 | |
|
Owners Assoc of Beach Club Condos Whatcom County |
31 | 1 | 0 | |
|
Sunset Park Water CO King County |
21 | 2 | 0 | |
|
Pasadena Park Irr Dist 17 Spokane County |
6,269 | 1 | 0 | |
|
Snoqualmie Pass Utility District King County |
5,832 | 2 | 1 | |
|
Westport Water Department Grays Harbor County |
5,346 | 1 | 0 | |
|
Okanogan Water Department City of Okanogan County |
3,817 | 1 | 0 | |
|
Lummi Tribal Water District Ferndale · County |
3,699 | 8 | 3 | |
|
Newport City of Pend Oreille County |
3,331 | 4 | 0 | |
|
Chewelah Water Dept South Stevens County |
2,615 | 2 | 0 | |
|
Mistequa Casino Chewelah · County |
2,070 | 5 | 0 | |
|
Suquamish Regional Public Water System Poulsbo · County |
1,874 | 5 | 0 | |
|
Harbor Hills Community Water System Island County |
1,373 | 4 | 1 | |
|
W&b Waterworks 1 Island County |
1,112 | 1 | 0 | |
|
Nisqually Commercial Park Thurston County |
940 | 1 | 0 | |
|
Jefferson County Water Dist #1 Jefferson County |
600 | 4 | 0 | |
|
Wellpinit Wellpinit · County |
525 | 6 | 2 | |
|
Saratoga Water District Island County |
477 | 2 | 0 | |
|
Nespelem Agency Nespelem · County |
445 | 9 | 0 | |
|
Riverside Town of Okanogan County |
429 | 5 | 1 | |
|
Country Mercantile Franklin County |
398 | 1 | 0 | |
|
Touchet School Walla Walla County |
303 | 1 | 0 | |
|
Homestead Manufactured Housing Benton County |
300 | 2 | 0 | |
|
New Utsalady Water System INC Island County |
291 | 2 | 0 | |
|
Hunters Water District Stevens County |
290 | 5 | 1 | |
|
Kahlotus City of Franklin County |
262 | 4 | 1 | |
|
Washtucna Water Department Adams County |
250 | 4 | 0 | |
|
Majestic Mobile Manor Pierce County |
238 | 1 | 0 | |
|
Fort Simcoe Job Corps Ctr Toppenish · County |
230 | 8 | 1 | |
|
Trails End Water District Mason County |
211 | 6 | 0 | |
|
Red Mountain Water Association Benton County |
200 | 5 | 0 | |
|
Trophy Lake Golf Course Kitsap County |
163 | 6 | 1 | |
|
Country Villa Mobile Park Stevens County |
162 | 3 | 0 | |
|
Sunset Water Distribution Assoc Island County |
159 | 2 | 0 | |
|
Isle Aire Beach Association Whatcom County |
125 | 1 | 0 | |
|
Campo Hacienda Island County |
123 | 4 | 0 | |
|
Montessori Spring Valley Supply King County |
121 | 1 | 0 | |
|
Chief Kitsap Academy Poulsbo · County |
120 | 6 | 0 | |
|
Centerville Grade School Klickitat County |
115 | 3 | 0 | |
|
North Lopez Service San Juan County |
114 | 4 | 0 | |
|
Potlatch Beach Mutual Mason County |
109 | 3 | 0 | |
|
T-11 Farmworker Housing Grant County |
99 | 1 | 0 | |
|
North Slope Estates Property Franklin County |
97 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Arsenic, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Arsenic alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.