All water systems in Washington
4,692 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Quincy Water Department City of Grant County |
8,415 | 1 | 0 | |
|
Yak CO Terrace Heights Yakima County |
8,410 | 3 | 0 | |
|
College Place Water Dept Walla Walla County |
8,147 | 0 | 0 | |
|
North Beach Water Pacific County |
8,093 | 0 | 0 | |
|
Milton City of Pierce County |
8,078 | 0 | 0 | |
|
Prosser City of Benton County |
8,030 | 1 | 0 | |
|
Kalama City of Cowlitz County |
8,020 | 0 | 0 | |
|
Fircrest City of Pierce County |
7,927 | 0 | 0 | |
|
Pacific City of King County |
7,925 | 0 | 0 | |
|
Model Irrigation Dist #18 Spokane County |
7,903 | 2 | 0 | |
|
Tanglewilde Thompson Place 600 Thurston County |
7,900 | 0 | 0 | |
|
Buckley Water Pierce County |
7,842 | 1 | 0 | |
|
Stevens CO Pud Suncrest Stevens County |
7,484 | 0 | 0 | |
|
Peacock Hill Pierce County |
7,401 | 0 | 0 | |
|
Jblm McChord Field Pierce County |
7,290 | 0 | 0 | |
|
Blaine City of Whatcom County |
6,800 | 0 | 0 | |
|
Lake Chelan Reclamation District Chelan County |
6,798 | 3 | 0 | |
|
Elma City of Grays Harbor County |
6,638 | 1 | 0 | |
|
Sallal Water Association INC King County |
6,600 | 0 | 0 | |
|
Union Gap Water Yakima County |
6,433 | 0 | 0 | |
|
Black Diamond Water Dept King County |
6,407 | 0 | 0 | |
|
Energy Dept Of/200w Benton County |
6,351 | 0 | 0 | |
|
Pasadena Park Irr Dist 17 Spokane County |
6,269 | 1 | 0 | |
|
Spo CO Water Dist 3 Sys 4 Spokane County |
6,233 | 0 | 0 | |
|
Montesano City of Grays Harbor County |
6,204 | 0 | 0 | |
|
Tulalip Bay Water Dist #1 Marysville · County |
5,968 | 1 | 0 | |
|
Snoqualmie Pass Utility District King County |
5,832 | 2 | 1 | |
|
Artondale Pierce County |
5,828 | 0 | 0 | |
|
Seven Lakes Water Association Snohomish County |
5,823 | 0 | 0 | |
|
Cashmere Water Department Chelan County |
5,815 | 1 | 0 | |
|
Benton City Water Benton County |
5,626 | 0 | 0 | |
|
Moxee Water Department Yakima County |
5,599 | 0 | 0 | |
|
North Bainbridge Water CO Kitsap County |
5,490 | 0 | 0 | |
|
Deer Park City of Spokane County |
5,435 | 3 | 0 | |
|
King County Water District #54 King County |
5,373 | 0 | 0 | |
|
Mattawa City of Grant County |
5,370 | 2 | 0 | |
|
Granite Falls City of Snohomish County |
5,349 | 0 | 0 | |
|
Westport Water Department Grays Harbor County |
5,346 | 1 | 0 | |
|
Water District 19 King County |
5,335 | 2 | 0 | |
|
Wapato Waterworks Yakima County |
5,255 | 3 | 0 | |
|
Point Evans Pierce County |
5,211 | 1 | 1 | |
|
Connell City of Franklin County |
5,150 | 1 | 1 | |
|
Grays Harbor CO Water Dist 2 Grays Harbor County |
5,112 | 1 | 0 | |
|
Minterbrook Pierce County |
5,083 | 0 | 0 | |
|
Spokane Business & Industrial Park Spokane County |
5,000 | 1 | 0 | |
|
Medical Lake City of Spokane County |
4,982 | 0 | 0 | |
|
Colville Water Department Stevens County |
4,945 | 1 | 0 | |
|
Omak City of Okanogan County |
4,940 | 0 | 0 | |
|
Longmire Pierce County |
4,871 | 3 | 0 | |
|
Sun Lakes State Park Grant County |
4,858 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
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.