Arsenic violations in Idaho
35 active public water systems in Idaho had a Arsenic violation in the past three years, 11 of them in the latest quarter of EPA's data. What Arsenic is and why it matters.
Systems with a Arsenic violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Idoc Idaho State Correctional Center Ada County |
2,204 | 3 | 1 | |
|
Indian Village Canyon County |
225 | 4 | 2 | |
|
Calvary Chapel of Emmett Emmett · Gem County |
192 | 7 | 1 | |
|
King Hill Domestic Water and Sewer Elmore County |
87 | 8 | 1 | |
|
Stanley Pond INC Ada County |
72 | 4 | 2 | |
|
Hammett Haven Apartments Elmore County |
64 | 5 | 1 | |
|
Partners Produce Payette County |
50 | 3 | 1 | |
|
Sunnyside Park Clearwater County |
40 | 7 | 2 | |
|
Fernan Estates Corporation Kootenai County |
37 | 2 | 0 | |
|
Degroot Canyon County |
30 | 2 | 1 | |
|
Thunder Canyon Estates Homeowners Assoc Bannock County |
25 | 1 | 0 | |
|
Sorrento Lactalis Canyon County |
700 | 5 | 0 | |
|
Idaho Supreme Bingham County |
250 | 5 | 1 | |
|
Mellen Subd Water Dist Elmore County |
250 | 6 | 1 | |
|
Kanaka Rapids Ranch Water System INC Twin Falls County |
240 | 5 | 1 | |
|
Hollister City of Twin Falls County |
220 | 4 | 0 | |
|
Banida Water and Sewer Dist Franklin County |
180 | 8 | 3 | |
|
Drake Subd Canyon County |
150 | 9 | 3 | |
|
Murtaugh City of Twin Falls County |
130 | 4 | 1 | |
|
Apache Heights Subdivision (2) Canyon County |
110 | 3 | 1 | |
|
Countryside Village Twin Falls County |
108 | 4 | 2 | |
|
Canyon School Dist 391 Kootenai County |
95 | 3 | 2 | |
|
Mart Produce Minidoka County |
90 | 2 | 1 | |
|
Yellow Pine Water Users INC Valley County |
72 | 4 | 1 | |
|
Lorraines Daycare Cassia County |
70 | 2 | 1 | |
|
Mountain Sage Elmore County |
65 | 9 | 2 | |
|
Ranch Subd Boise County |
65 | 3 | 0 | |
|
Gannett Homeowners Assn Blaine County |
60 | 6 | 2 | |
|
Red Rock Water LLC Nez Perce County |
60 | 5 | 1 | |
|
Cassandra Hills Owners Assn Benewah County |
57 | 1 | 0 | |
|
Valley View Water Nampa · Canyon County |
57 | 3 | 1 | |
|
Curley Creek Water Assn Boundary County |
50 | 2 | 0 | |
|
Midway Water System INC Franklin County |
50 | 2 | 1 | |
|
Sunnyridge I Subd Canyon County |
35 | 3 | 1 | |
|
Wild Meadows I Subd Bonner County |
27 | 5 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Arsenic, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Arsenic 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.