Pentachlorophenol violations in Washington
44 active public water systems in Washington had a Pentachlorophenol violation in the past three years, 9 of them in the latest quarter of EPA's data. What Pentachlorophenol is and why it matters.
Systems with a Pentachlorophenol violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Monse-Riggan Camp Okanogan County |
1,165 | 4 | 1 | |
|
Project Cougar Whitman County |
283 | 3 | 1 | |
|
Rainier Pure Beef CO Cowlitz County |
251 | 2 | 0 | |
|
Trails End Water District Mason County |
211 | 6 | 0 | |
|
Trophy Lake Golf Course Kitsap County |
163 | 6 | 1 | |
|
Columbia Place LLC Benton County |
125 | 3 | 0 | |
|
Trails West Subdivision Stevens County |
27 | 7 | 1 | |
|
Twin Pines Mobile Home Park Okanogan County |
25 | 7 | 1 | |
|
Skyline Ridge Kittitas County |
20 | 2 | 0 | |
|
Pasco Water Department Franklin County |
115,102 | 2 | 0 | |
|
Chelan Water Dept City of Chelan County |
9,425 | 2 | 0 | |
|
Deer Park City of Spokane County |
5,435 | 3 | 0 | |
|
White Pass Company INC Lewis County |
2,094 | 4 | 0 | |
|
Basin City Water Sewer District Franklin County |
1,740 | 5 | 0 | |
|
Ritzville Water Department Adams County |
1,725 | 2 | 0 | |
|
Makah Neah Bay Neah Bay · County |
1,300 | 11 | 0 | |
|
Weiler-Martin Tracts Water Assn Grant County |
1,163 | 2 | 0 | |
|
Waterville Town of Douglas County |
1,140 | 2 | 0 | |
|
ST John Town of Whitman County |
800 | 2 | 0 | |
|
Wellpinit School County |
473 | 5 | 0 | |
|
Sierra Water System Pierce County |
355 | 2 | 0 | |
|
Sunwood Graham Pierce County |
315 | 2 | 0 | |
|
Fort Simcoe Job Corps Ctr Toppenish · County |
230 | 8 | 1 | |
|
Mountainview Elementary School Yakima County |
220 | 2 | 0 | |
|
Red Mountain Water Association Benton County |
200 | 5 | 0 | |
|
Sydney Heights Water Assn Walla Walla County |
130 | 2 | 0 | |
|
Chief Kitsap Academy Poulsbo · County |
120 | 6 | 0 | |
|
Black Lake Acres Thurston County |
104 | 2 | 0 | |
|
Salkum Water Supply Lewis County |
103 | 3 | 0 | |
|
MT ST Helens National Volcanic Monu Clark County |
95 | 4 | 0 | |
|
Marble Water System Stevens County |
94 | 7 | 1 | |
|
San Poil Keller · County |
86 | 5 | 0 | |
|
University Heights San Juan County |
76 | 3 | 0 | |
|
Davis Landing Water System Island County |
74 | 3 | 0 | |
|
Painted Hills Water Association Grant County |
70 | 3 | 0 | |
|
San Juan County PW Beaverton San Juan County |
61 | 2 | 0 | |
|
Stevens CO Pud Denison Spokane County |
60 | 1 | 0 | |
|
Tierra Chelan County |
57 | 3 | 0 | |
|
Hannah Heights #2 Water Users Assn San Juan County |
44 | 2 | 0 | |
|
Prospect Heights Comm Water Assn Walla Walla County |
40 | 3 | 0 | |
|
Rockaway Beach Community Assn Island County |
40 | 3 | 0 | |
|
Sunset Water & Maintenance Assoc Whatcom County |
35 | 3 | 0 | |
|
Tiger Mtn Tracts King County |
30 | 4 | 1 | |
|
West Deer Lake #1 Island County |
24 | 5 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Pentachlorophenol, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Pentachlorophenol 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.