Nitrate-Nitrite (Combined) violations in Montana
338 active public water systems in Montana had a Nitrate-Nitrite (Combined) violation in the past three years, 10 of them in the latest quarter of EPA's data. What Nitrate-Nitrite (Combined) is and why it matters.
Systems with a Nitrate-Nitrite (Combined) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
One Stop Hot Springs · Sanders County |
500 | 3 | 0 | |
|
Fromberg Town of Fromberg · Carbon County |
498 | 5 | 1 | |
|
Anaconda Interchange Rest Area Anaconda · Deer Lodge County |
465 | 1 | 0 | |
|
Broadus Town of Broadus · Powder River County |
450 | 3 | 0 | |
|
Woodys Country Store Kalispell · Flathead County |
418 | 2 | 0 | |
|
Pryor Water System County |
406 | 7 | 1 | |
|
Manhattan Christian Schools Manhattan · Gallatin County |
400 | 3 | 0 | |
|
Gallatin Gateway Inn Gallatin Gateway · Gallatin County |
375 | 1 | 0 | |
|
Jordan Town of Jordan · Garfield County |
364 | 5 | 1 | |
|
Sun Prairie Water District Great Falls · Cascade County |
350 | 5 | 1 | |
|
Maverick Mountain Resort LLC Polaris · Beaverhead County |
340 | 2 | 0 | |
|
Dutton Town of Dutton · Teton County |
338 | 6 | 0 | |
|
Stacey's Bar-The Westerner Gallatin Gateway · Gallatin County |
315 | 2 | 0 | |
|
Archer Acres Whitefish · Flathead County |
305 | 1 | 0 | |
|
Clyde Park Water Dept Clyde Park · Park County |
300 | 6 | 0 | |
|
Holter Dam CG Blm Wolf Creek · Lewis and Clark County |
300 | 1 | 0 | |
|
Kims Marina and Resort Helena · Lewis and Clark County |
300 | 3 | 2 | |
|
Peter Yegen JR Golf Club Billings · Yellowstone County |
300 | 1 | 0 | |
|
Wyola Water System County |
281 | 10 | 1 | |
|
Big Sky School District NO 72 Gallatin Gateway · Gallatin County |
275 | 2 | 0 | |
|
Trapper Creek Job Corps Darby · Ravalli County |
275 | 4 | 0 | |
|
Kountry Korner Cafe Bozeman · Gallatin County |
274 | 2 | 0 | |
|
Winifred Town of Winifred · Fergus County |
274 | 7 | 1 | |
|
Korner Klub Bozeman · Gallatin County |
264 | 2 | 0 | |
|
Forlorn Hope LLC Missoula · Missoula County |
262 | 3 | 1 | |
|
Allard's Stage Stop County |
260 | 3 | 1 | |
|
Forest Park TR CT NO 1 Bozeman Bozeman · Gallatin County |
260 | 2 | 0 | |
|
Gardiner Business Park Gardiner · Park County |
260 | 1 | 0 | |
|
Gates of the Mountains INC Helena · Lewis and Clark County |
251 | 2 | 0 | |
|
Blue Sky Heights Wua Clancy Clancy · Jefferson County |
250 | 4 | 1 | |
|
Clark's Bay Rec Site Helena · Lewis and Clark County |
250 | 1 | 0 | |
|
Granite Park Water Association Billings · Yellowstone County |
250 | 2 | 0 | |
|
Fort Peck Town of Fort Peck · Valley County |
240 | 3 | 0 | |
|
Crystal Springs Water System Billings · Yellowstone County |
225 | 2 | 0 | |
|
Salish Shores Trade Winds Comm Village Thompson Falls · Sanders County |
215 | 1 | 0 | |
|
Western Ranch Supply Billings · Yellowstone County |
215 | 1 | 0 | |
|
Big Hole National Battlefield Wisdom · Beaverhead County |
214 | 1 | 0 | |
|
Chubbys Bar and Grill Clancy · Jefferson County |
211 | 2 | 0 | |
|
Fetty's LLC Wisdom · Beaverhead County |
211 | 1 | 0 | |
|
Elevate Church Missoula · Missoula County |
206 | 1 | 0 | |
|
Beartooth Christian Camp Fishtail · Stillwater County |
205 | 1 | 0 | |
|
Johnson's of St. Mary County |
205 | 2 | 0 | |
|
Norris Hot Springs Norris · Madison County |
204 | 2 | 0 | |
|
Fort Rockvale Restaurant Fromberg · Carbon County |
202 | 2 | 0 | |
|
Hell Creek Recreation Area LLC Jordan · Garfield County |
202 | 2 | 0 | |
|
Three Forks KOA Three Forks · Broadwater County |
202 | 2 | 0 | |
|
Church at Creston Kalispell · Flathead County |
200 | 1 | 0 | |
|
Galata County Water District Galata · Toole County |
200 | 1 | 0 | |
|
Hidden Valley Owner LLC Bozeman · Gallatin County |
200 | 1 | 0 | |
|
Rocky Mountain Supply Townsend Townsend · Broadwater County |
200 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Nitrate-Nitrite (Combined), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Nitrate-Nitrite (Combined) 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.