Thallium violations in Washington
21 active public water systems in Washington had a Thallium violation in the past three years. What Thallium is and why it matters.
Systems with a Thallium violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Wellpinit Wellpinit · County |
525 | 6 | 2 | |
|
Kahlotus City of Franklin County |
262 | 4 | 1 | |
|
Washtucna Water Department Adams County |
250 | 4 | 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 | |
|
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 | |
|
Marble Water System Stevens County |
94 | 7 | 1 | |
|
Lake Wenatchee Water District Chelan County |
86 | 3 | 0 | |
|
Alpine Acres Community Association Chelan County |
51 | 6 | 0 | |
|
Holiday Hills Community Club INC Pierce County |
50 | 4 | 0 | |
|
Pleasant Harbor Marina Jefferson County |
50 | 4 | 0 | |
|
Maple Hill Park Island County |
35 | 4 | 0 | |
|
Faranda Water Associaton Island County |
28 | 6 | 1 | |
|
Trails West Subdivision Stevens County |
27 | 7 | 1 | |
|
Twin Pines Mobile Home Park Okanogan County |
25 | 7 | 1 | |
|
Winlock Waters 2 Lewis County |
25 | 4 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Thallium, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Thallium 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.