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.
Health effects: The combined limit protects against methemoglobinemia — the same risk as nitrate alone and nitrite alone. In infants under 6 months, gut bacteria convert these nitrogen compounds to forms that block oxygen transport in blood ('blue baby syndrome'). Pregnant women and individuals with certain enzyme deficiencies are also at elevated risk.
Systems with a Nitrate-Nitrite (Combined) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Manhattan Camper Court Manhattan · Gallatin County |
105 | 3 | 0 | |
|
Marias Valley Golf and Country Club Shelby · Toole County |
105 | 2 | 0 | |
|
ST Regis Super 8 Motel St Regis · Mineral County |
105 | 1 | 0 | |
|
Trixis Antler Saloon Ovando · Powell County |
105 | 2 | 0 | |
|
Hungry Bear Bar & Grill Condon · Missoula County |
104 | 1 | 0 | |
|
N8v Grown Charlo · Lake County |
103 | 3 | 2 | |
|
Bozeman Trail Campground Bozeman · Gallatin County |
102 | 2 | 0 | |
|
Grass Range Town of Grass Range · Fergus County |
102 | 4 | 0 | |
|
Montana Bar & Bbq Saltese · Mineral County |
102 | 1 | 0 | |
|
Uncle Joes Oasis Bar and Grill Wolf Creek · Lewis and Clark County |
102 | 4 | 3 | |
|
Big Bend Ranch Subdivision Great Falls · Cascade County |
100 | 4 | 1 | |
|
Bynum Teton CO W & S District Bynum · Teton County |
100 | 3 | 1 | |
|
Causeway Chalet Helena · Lewis and Clark County |
100 | 3 | 1 | |
|
Chinaman Gulch Campground Helena · Lewis and Clark County |
100 | 2 | 0 | |
|
Harrison School District NO 23 Harrison · Madison County |
100 | 3 | 0 | |
|
Headwaters Rest Area Three Forks · Broadwater County |
100 | 2 | 0 | |
|
Hunters Alley Bar and Grill Elliston · Powell County |
100 | 2 | 0 | |
|
Jefferson City North Rest Stop Jefferson City · Jefferson County |
100 | 2 | 0 | |
|
Mosby Rest Area Winnett · Garfield County |
100 | 1 | 0 | |
|
OS Management LLC Emigrant · Park County |
100 | 2 | 1 | |
|
Quick Stop Drive in Joliet · Carbon County |
100 | 2 | 0 | |
|
Riverside Campground Helena · Lewis and Clark County |
100 | 2 | 0 | |
|
Rolling Rubber Point S Glendive Glendive · Dawson County |
100 | 2 | 0 | |
|
Rosebud School District NO 12 Rosebud · Rosebud County |
100 | 3 | 0 | |
|
Seven Gables Resort Anaconda · Deer Lodge County |
100 | 3 | 0 | |
|
Vsh of Montana LLC Victor · Ravalli County |
100 | 1 | 0 | |
|
White Earth Recreation Area East Helena · Broadwater County |
100 | 2 | 0 | |
|
Fortine School District 14 Fortine · Lincoln County |
98 | 1 | 0 | |
|
Ramsay Water and Sewer District Ramsay · Silver Bow County |
97 | 3 | 0 | |
|
Rollins Restaurant RV Park Rollins · Lake County |
97 | 2 | 1 | |
|
Potomac Bar Bonner · Missoula County |
93 | 3 | 0 | |
|
ST John the Baptist Church Missoula · Missoula County |
91 | 2 | 0 | |
|
Big Sky Grocery Unapproved Moore · Fergus County |
90 | 1 | 0 | |
|
Birch Creek Outdoor ED Center Dillon · Beaverhead County |
90 | 2 | 0 | |
|
Galen Facility Anaconda · Deer Lodge County |
90 | 3 | 0 | |
|
Solid Rock Ventures LLC Kalispell · Flathead County |
90 | 2 | 0 | |
|
Elkhorn Health and Rehabilitation LLC Clancy · Jefferson County |
89 | 3 | 0 | |
|
Heart of Glacier Campground & Cabins County |
89 | 2 | 0 | |
|
7th Day Adventist Christian School Hamilton · Ravalli County |
88 | 2 | 0 | |
|
Hoyt and Scout LLC Toston · Broadwater County |
87 | 2 | 1 | |
|
Springdale Hutterite Colony White Sulphur Springs · Meagher County |
87 | 3 | 0 | |
|
Flathead Lake United Methodist Camp Rollins · Lake County |
86 | 1 | 0 | |
|
Halfway House Troy · Lincoln County |
86 | 2 | 0 | |
|
Koocanusa Resort and Marina LLC Libby · Lincoln County |
86 | 1 | 0 | |
|
Cottonwood Camp Fort Smith Fort Smith · Big Horn County |
85 | 3 | 1 | |
|
Stillwater Water District Kalispell · Flathead County |
85 | 2 | 1 | |
|
Moose Creek Resort West Glacier · Flathead County |
84 | 1 | 0 | |
|
Templed Hills Baptist Camp Livingston · Park County |
82 | 3 | 0 | |
|
Whispering Pines Campground Columbia Falls · Flathead County |
82 | 2 | 1 | |
|
Camp Rotary Club Monarch Great Falls · Cascade County |
80 | 1 | 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.