Surface Water Treatment Rule (SWTR) violations in Washington
29 active public water systems in Washington had a Surface Water Treatment Rule (SWTR) violation in the past three years, 10 of them in the latest quarter of EPA's data. What Surface Water Treatment Rule (SWTR) is and why it matters.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Carson Skamania County |
3,015 | 2 | 0 | |
|
Naselle Pacific County |
2,073 | 1 | 0 | |
|
Columbia Generating Station Benton County |
1,302 | 1 | 1 | |
|
McNeil Island Water Pierce County |
692 | 2 | 1 | |
|
Forty Nine Degrees North Stevens County |
670 | 2 | 1 | |
|
Lisecc Whatcom County |
357 | 2 | 1 | |
|
Orient Water Company Ferry County |
167 | 4 | 1 | |
|
Granite Shores Water System Pend Oreille County |
82 | 1 | 1 | |
|
Sunnybank Water System Chelan County |
58 | 2 | 0 | |
|
Industrial Development Complex Benton County |
52 | 1 | 1 | |
|
Skagit County Pud 1 Judy Res Skagit County |
111,415 | 2 | 0 | |
|
Lynden Water Department Whatcom County |
20,062 | 2 | 0 | |
|
Lake Chelan Reclamation District Chelan County |
6,798 | 3 | 0 | |
|
Castle Rock Municipal Water Cowlitz County |
4,367 | 2 | 0 | |
|
Stevens Pass Water System King County |
4,053 | 1 | 0 | |
|
Crescent Water Assn Clallam County |
2,360 | 2 | 0 | |
|
Cathlamet Water Dept Wahkiakum County |
1,636 | 2 | 0 | |
|
Makah Neah Bay Neah Bay · County |
1,300 | 11 | 0 | |
|
PE Ell Town of Lewis County |
859 | 4 | 0 | |
|
Thunderbird Park Snohomish County |
454 | 1 | 0 | |
|
Black Diamond Water District Clallam County |
452 | 3 | 0 | |
|
Olga Water Users INC San Juan County |
392 | 1 | 0 | |
|
Blakely Is. Maintenance Commission San Juan County |
333 | 2 | 0 | |
|
Transalta Centralia Generation Lewis County |
200 | 1 | 0 | |
|
Bullitt Center King County |
175 | 2 | 0 | |
|
Buck Creek Pierce County |
165 | 2 | 0 | |
|
Oyster Creek Inn Skagit County |
103 | 1 | 0 | |
|
Thunderbird Terrace Water System Snohomish County |
75 | 2 | 0 | |
|
Hozomeen Water System Whatcom County |
21 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) 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.