Surface Water Treatment Rule (SWTR) violations in Idaho
23 active public water systems in Idaho had a Surface Water Treatment Rule (SWTR) violation in the past three years, 9 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 |
|---|---|---|---|---|
|
Kamiah City of Lewis County |
1,495 | 6 | 1 | |
|
Challis City of Custer County |
900 | 5 | 1 | |
|
Elk City Water and Sewer Assn Idaho County |
320 | 5 | 0 | |
|
Rose Lake Water Assn Kootenai County |
300 | 3 | 1 | |
|
Paradise Estates Water Corp Ada County |
273 | 4 | 1 | |
|
YMCA Horsethief Camp Cascade · Valley County |
220 | 5 | 1 | |
|
Ahsahka Water and Sewer Dist Clearwater County |
85 | 6 | 4 | |
|
Paradise Point Valley County |
80 | 2 | 0 | |
|
Strawberry Mink Creek Water Assn Franklin County |
75 | 5 | 1 | |
|
Glenns Ferry City of Elmore County |
1,282 | 3 | 0 | |
|
Franklin City of Franklin County |
1,000 | 2 | 0 | |
|
Kootenai County Water Dist 1 Kootenai County |
843 | 6 | 3 | |
|
Pierce City of Clearwater County |
467 | 4 | 1 | |
|
Pine Ridge Water and Sewer Dist Idaho County |
390 | 4 | 1 | |
|
Hayden Haven / Gem Shores Kootenai County |
236 | 1 | 0 | |
|
Woodland Shores Water and Sewer Assn Kootenai County |
210 | 3 | 0 | |
|
Sunnyside Water Assn Bonner County |
125 | 3 | 1 | |
|
Idpr Dworshak Freeman Creek CG (corps) Clearwater County |
100 | 4 | 1 | |
|
Trow Creek Water Assn Boundary County |
98 | 3 | 1 | |
|
Little Blacktail Ranch Water District Bonner County |
95 | 2 | 0 | |
|
Kullyspell Estates Bonner County |
92 | 3 | 0 | |
|
Yellow Pine Water Users INC Valley County |
72 | 4 | 1 | |
|
Featherville Townsite Water Corp Elmore County |
60 | 4 | 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 Idaho 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.