All water systems in Washington
4,692 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sno Pud 1 May Creek Snohomish County |
1,374 | 1 | 0 | |
|
Harbor Hills Community Water System Island County |
1,373 | 4 | 1 | |
|
Pelican Point by Cascadia LLC Grant County |
1,357 | 1 | 0 | |
|
Whatcom County Water Dist #2 Whatcom County |
1,353 | 0 | 0 | |
|
Colville Fuels Noisy Waters Nespelem · County |
1,350 | 1 | 0 | |
|
Winthrop Town of Okanogan County |
1,350 | 4 | 0 | |
|
Carlsborg Lud 10 12 13 14 Clallam County |
1,349 | 0 | 0 | |
|
Nooksack Valley Water Association Whatcom County |
1,343 | 0 | 0 | |
|
Chelan County Fairground Chelan County |
1,335 | 1 | 0 | |
|
Winchester EB Rest Area Grant County |
1,330 | 1 | 0 | |
|
Evergreen Shores Thurston County |
1,329 | 0 | 0 | |
|
Oakville City of Grays Harbor County |
1,325 | 0 | 0 | |
|
Shorecrest Estates Water Co Mason County |
1,321 | 3 | 1 | |
|
Riverside SD Central Site Schools Spokane County |
1,320 | 0 | 0 | |
|
Telford Rest Area Lincoln County |
1,309 | 1 | 0 | |
|
Harrah Water System Yakima County |
1,304 | 1 | 0 | |
|
Columbia Generating Station Benton County |
1,302 | 1 | 1 | |
|
Grays Harbor CO Water Dist 1 Grays Harbor County |
1,302 | 0 | 0 | |
|
Mount Spokane Ski #2 Spokane County |
1,301 | 1 | 0 | |
|
Makah Neah Bay Neah Bay · County |
1,300 | 11 | 0 | |
|
North Mason High School Mason County |
1,300 | 1 | 0 | |
|
Diamond Lake Water & Sewer District Pend Oreille County |
1,299 | 1 | 0 | |
|
Palouse Water Dept City of Whitman County |
1,298 | 0 | 0 | |
|
Battle Ground State Park Clark County |
1,290 | 0 | 0 | |
|
Charbonneau Park Walla Walla County |
1,287 | 0 | 0 | |
|
Northwest Trek Pierce County |
1,283 | 0 | 0 | |
|
Rochester High School Thurston County |
1,275 | 0 | 0 | |
|
Carlyon Beach Homeowners Thurston County |
1,273 | 2 | 0 | |
|
Walla Walla University Walla Walla County |
1,273 | 1 | 0 | |
|
Western Forest Industries Museum Lewis County |
1,266 | 1 | 0 | |
|
Freeland Water and Sewer District Island County |
1,264 | 2 | 0 | |
|
BC Water CO Benton County |
1,262 | 0 | 0 | |
|
Lakeview Park Water Assn Grant County |
1,259 | 1 | 0 | |
|
Hatton Coulee Rest Area Adams County |
1,255 | 1 | 0 | |
|
Garfield County Fairgrounds Garfield County |
1,250 | 0 | 0 | |
|
Concrete Utilities Skagit County |
1,234 | 2 | 1 | |
|
Frontier County Park Pierce County |
1,230 | 0 | 0 | |
|
Frog Pond Kitsap County |
1,229 | 0 | 0 | |
|
Stevens CO Pud Waitts Lake Stevens County |
1,216 | 0 | 0 | |
|
Roy City of Pierce County |
1,214 | 1 | 0 | |
|
Swinomish Laconner · County |
1,212 | 0 | 0 | |
|
Washington State Corrections-Women Pierce County |
1,205 | 0 | 0 | |
|
South Whidbey State Park Island County |
1,203 | 0 | 0 | |
|
Keyport Water Kitsap County |
1,202 | 1 | 0 | |
|
Community Sewer and Water District Benton County |
1,200 | 1 | 0 | |
|
Harrison Well #2 Yakima County |
1,200 | 0 | 0 | |
|
Whitworth University Spokane County |
1,200 | 1 | 0 | |
|
Fisherman Bay Water Association San Juan County |
1,195 | 0 | 0 | |
|
Warm Beach Conference Grounds Snohomish County |
1,190 | 1 | 0 | |
|
Lewis CO Water Dist #1 Lewis County |
1,174 | 1 | 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 currently 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.