2,3,7,8-TCDD (Dioxin) violations in Washington
9 active public water systems in Washington had a 2,3,7,8-TCDD (Dioxin) violation in the past three years, 1 of them in the latest quarter of EPA's data. What 2,3,7,8-TCDD (Dioxin) is and why it matters.
Systems with a 2,3,7,8-TCDD (Dioxin) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Snoqualmie Casino Snoqualmie · County |
3,000 | 3 | 0 | |
|
Angel of the Winds Arlington · County |
2,303 | 5 | 0 | |
|
Makah Neah Bay Neah Bay · County |
1,300 | 11 | 0 | |
|
Chehalis Tribal Housing Oakville · County |
620 | 7 | 0 | |
|
Wellpinit School County |
473 | 5 | 0 | |
|
Fort Simcoe Job Corps Ctr Toppenish · County |
230 | 8 | 1 | |
|
Stillaguamish Village Mount Vernon · County |
210 | 6 | 1 | |
|
Chief Kitsap Academy Poulsbo · County |
120 | 6 | 0 | |
|
San Poil Keller · County |
86 | 5 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved 2,3,7,8-TCDD (Dioxin), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not 2,3,7,8-TCDD (Dioxin) 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.