All water systems in Washington
4,692 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Edmonds City of Snohomish County |
34,065 | 0 | 0 | |
|
Parkland Light & Water Company Pierce County |
33,775 | 1 | 0 | |
|
Bothell Water City of King County |
33,643 | 1 | 0 | |
|
North City Water District King County |
32,847 | 0 | 0 | |
|
Moses Lake City of Grant County |
32,428 | 0 | 0 | |
|
Camas Municipal Water Sewer System Clark County |
31,794 | 2 | 0 | |
|
Mukilteo Water & Wastewater Distr Snohomish County |
31,437 | 0 | 0 | |
|
Pullman Water Department City of Whitman County |
31,315 | 3 | 0 | |
|
Mercer Island City of King County |
31,057 | 0 | 0 | |
|
Battle Ground Water Dept City of Clark County |
30,237 | 1 | 0 | |
|
Quil Ceda Village Tulalip · County |
30,000 | 4 | 0 | |
|
Arlington City of Snohomish County |
29,508 | 0 | 0 | |
|
Fife Dept of Public Works Pierce County |
29,091 | 1 | 0 | |
|
West Sound Utility District #1 Kitsap County |
28,930 | 1 | 0 | |
|
Cedar River Water & Sewer District King County |
28,671 | 0 | 0 | |
|
Centralia Public Works Water Lewis County |
28,164 | 0 | 0 | |
|
Port Angeles City of Clallam County |
28,067 | 0 | 0 | |
|
Whitworth Water District 2 Spokane County |
26,883 | 1 | 0 | |
|
East Wenatchee Water District Douglas County |
26,519 | 1 | 0 | |
|
Mountlake Terrace City of Snohomish County |
26,402 | 1 | 0 | |
|
Anacortes City of Skagit County |
25,109 | 0 | 0 | |
|
Cross Valley Water District Snohomish County |
24,695 | 0 | 0 | |
|
Vera Water & Power Spokane County |
24,692 | 1 | 1 | |
|
North Perry Ave Water District Kitsap County |
24,402 | 0 | 0 | |
|
Lake Meridian Water District King County |
24,231 | 1 | 0 | |
|
Oak Harbor City of Island County |
23,675 | 1 | 0 | |
|
King County Water District #49 King County |
23,492 | 0 | 0 | |
|
Monroe Water System Snohomish County |
23,467 | 1 | 0 | |
|
Enumclaw Water Department King County |
23,276 | 0 | 0 | |
|
Aberdeen City of Grays Harbor County |
22,867 | 1 | 0 | |
|
Pud #1 of Asotin County Asotin County |
21,930 | 0 | 0 | |
|
King County Water District #125 King County |
21,904 | 1 | 0 | |
|
Washington State University Whitman County |
21,506 | 0 | 0 | |
|
Washougal City of Clark County |
21,441 | 0 | 0 | |
|
West Richland City of Benton County |
21,231 | 0 | 0 | |
|
Ridgefield Public Works Clark County |
21,225 | 0 | 0 | |
|
Consolidated Irrig Dist 19 System 2 Spokane County |
21,220 | 1 | 0 | |
|
Ellensburg Water Dept Kittitas County |
20,900 | 1 | 0 | |
|
Snoqualmie Water King County |
20,222 | 0 | 0 | |
|
King County Water District NO 90 King County |
20,100 | 1 | 0 | |
|
Lynden Water Department Whatcom County |
20,062 | 2 | 0 | |
|
Ferndale Whatcom County |
19,305 | 1 | 0 | |
|
Summit Water & Supply CO Pierce County |
19,125 | 0 | 0 | |
|
Spo CO Water Dist 3 Sys 1 Spokane County |
19,035 | 0 | 0 | |
|
Modern Electric Water CO Spokane County |
18,487 | 0 | 0 | |
|
Poulsbo City of Kitsap County |
18,400 | 1 | 0 | |
|
Olympic View Water & Sewer District Snohomish County |
17,784 | 1 | 0 | |
|
Stanwood Water Dept City of Snohomish County |
17,586 | 0 | 0 | |
|
Yelm City of Thurston County |
17,355 | 0 | 0 | |
|
Sunnyside City of Yakima County |
17,194 | 4 | 1 |
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.