Methoxychlor violations in Washington
44 active public water systems in Washington had a Methoxychlor violation in the past three years, 8 of them still unresolved. What Methoxychlor is and why it matters.
Systems with a Methoxychlor violation
Unresolved 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 | |
|
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 | |
|
Deer Park City of Spokane County |
5,435 | 3 | 0 | |
|
Badger Mountain Irrigation District Benton County |
2,331 | 2 | 0 | |
|
White Pass Company INC Lewis County |
2,094 | 4 | 0 | |
|
Ritzville Water Department Adams County |
1,725 | 2 | 0 | |
|
Makah Neah Bay Neah Bay · County |
1,300 | 11 | 0 | |
|
Underwood Skamania County |
1,000 | 2 | 0 | |
|
Chehalis Tribal Housing Oakville · County |
620 | 7 | 0 | |
|
Wellpinit School County |
473 | 5 | 0 | |
|
Riverside Town of Okanogan County |
429 | 5 | 1 | |
|
Sierra Water System Pierce County |
355 | 2 | 0 | |
|
Sunwood Graham Pierce County |
315 | 2 | 0 | |
|
Hunters Water District Stevens County |
290 | 5 | 1 | |
|
Dashmesh Petroleum Lewis County |
284 | 1 | 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 | |
|
Burbank Heights Walla Walla County |
177 | 4 | 0 | |
|
Taggares Fruit Co Walla Walla County |
152 | 2 | 0 | |
|
South Hills Water Users Assn INC Yakima County |
135 | 1 | 0 | |
|
Chief Kitsap Academy Poulsbo · County |
120 | 6 | 0 | |
|
Salkum Water Supply Lewis County |
103 | 3 | 0 | |
|
Marble Water System Stevens County |
94 | 7 | 1 | |
|
San Poil Keller · County |
86 | 5 | 0 | |
|
Painted Hills Water Association Grant County |
70 | 3 | 0 | |
|
Whitestone Pears Okanogan County |
62 | 2 | 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 | |
|
Cedar Grove Composting Water System King County |
50 | 2 | 0 | |
|
Kooskooskie Cabin Owners Inc. Walla Walla County |
45 | 1 | 0 | |
|
Williams Lake Beach Club Spokane County |
45 | 2 | 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 | |
|
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 Methoxychlor, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Methoxychlor 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.