Atrazine violations in Montana
37 active public water systems in Montana had a Atrazine violation in the past three years, 1 of them still unresolved. What Atrazine is and why it matters.
Systems with a Atrazine violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Hungry Horse Dam Hungry Horse · Flathead County |
30 | 1 | 0 | |
|
Big Mountain Water Company Whitefish · Flathead County |
2,435 | 1 | 0 | |
|
Montana State Prison Deer Lodge · Powell County |
2,100 | 8 | 1 | |
|
Sheridan Town of Sheridan · Madison County |
632 | 5 | 0 | |
|
Frenchtown High School Frenchtown · Missoula County |
550 | 5 | 0 | |
|
Wibaux Town of Wibaux · Wibaux County |
550 | 8 | 0 | |
|
Box Elder School District 13g Box Elder · Hill County |
500 | 7 | 0 | |
|
Gore Hill County Water Dist Great Falls · Cascade County |
500 | 4 | 0 | |
|
Sun Prairie Water District Great Falls · Cascade County |
350 | 5 | 1 | |
|
Wyola Water System County |
281 | 10 | 1 | |
|
Farm to Market Store Libby · Lincoln County |
274 | 2 | 0 | |
|
Winifred Town of Winifred · Fergus County |
274 | 7 | 1 | |
|
Glacier View School County |
265 | 3 | 0 | |
|
Anderson School Bozeman · Gallatin County |
220 | 7 | 0 | |
|
Curious Minds Montessori Preschool Stevensville · Ravalli County |
205 | 4 | 1 | |
|
Glendive Alliance Church Glendive · Dawson County |
200 | 3 | 0 | |
|
Cskt Division of Fire Management County |
190 | 7 | 1 | |
|
Winnett Town of Winnett · Petroleum County |
187 | 8 | 1 | |
|
Bitterroot Gateway MB PK Lolo Lolo · Missoula County |
130 | 6 | 0 | |
|
Riders Trailer Court Manhattan · Gallatin County |
100 | 4 | 0 | |
|
Hi-Line Colony Whitlash · Liberty County |
92 | 4 | 0 | |
|
Greenfield Elem School Dist 75 Fairfield · Teton County |
90 | 5 | 0 | |
|
S&k Electronics County |
80 | 3 | 1 | |
|
Swlo and Main Office Missoula · Missoula County |
75 | 7 | 0 | |
|
Fedex Relay Center Billings · Yellowstone County |
74 | 2 | 0 | |
|
Hartland Colony Havre · Blaine County |
73 | 5 | 1 | |
|
All West Business Park Lot 3 Bozeman · Gallatin County |
70 | 4 | 0 | |
|
Barnett Water Users System Helena · Lewis and Clark County |
70 | 6 | 0 | |
|
Water Resources Division Missoula · Missoula County |
60 | 8 | 1 | |
|
Eagle Fjord Bozeman · Gallatin County |
55 | 2 | 0 | |
|
Graymont Western US INC Townsend · Broadwater County |
52 | 2 | 0 | |
|
Trinity School District #4 in L & C CO Marysville · Lewis and Clark County |
50 | 2 | 0 | |
|
Lil Sprouts Daycare Florence · Ravalli County |
43 | 2 | 0 | |
|
Buffalo Ranch Water Company Livingston · Park County |
33 | 2 | 0 | |
|
Beartooth Spring Water Red Lodge · Carbon County |
25 | 4 | 0 | |
|
Fishermans Village Subdivision West Yellowstone · Gallatin County |
25 | 9 | 1 | |
|
Riceville Heights Subdivision Belt · Cascade County |
25 | 5 | 2 |
About this data
A system is counted once if any of its violations in the past three years involved Atrazine, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Atrazine 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 Montana 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.