All water systems in Montana
2,352 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lds Church Whitehall Whitehall · Jefferson County |
75 | 0 | 0 | |
|
Livingston Paradise Val KOA S Well NO 1 Livingston · Park County |
75 | 2 | 1 | |
|
Lone Mountain Guest Ranch Big Sky · Gallatin County |
75 | 1 | 0 | |
|
Lone Rock Bible Church Stevensville · Ravalli County |
75 | 1 | 0 | |
|
Longhorn Bar Rosebud · Rosebud County |
75 | 0 | 0 | |
|
Loyal Order of Moose NO 639 Helena · Lewis and Clark County |
75 | 1 | 0 | |
|
Madison River Recreation Area Ennis · Madison County |
75 | 1 | 0 | |
|
Martinsdale Water and Sewer District Martinsdale · Meagher County |
75 | 1 | 0 | |
|
McDonald Trailer CT East Helena · Lewis and Clark County |
75 | 3 | 0 | |
|
Midway Townhomes Wua Billings · Yellowstone County |
75 | 1 | 0 | |
|
Musselshell Community County Wsd Musselshell · Musselshell County |
75 | 0 | 0 | |
|
Ravalli Electric CO OP Corvallis · Ravalli County |
75 | 1 | 0 | |
|
Rivers Edge Mobile Home Park Grt Fls Great Falls · Cascade County |
75 | 1 | 0 | |
|
Rocky Mountain Building Company Hamilton · Ravalli County |
75 | 0 | 0 | |
|
Skyline TR CT and RV Park Dillon · Beaverhead County |
75 | 3 | 1 | |
|
Spencer and CO Kalispell · Flathead County |
75 | 0 | 0 | |
|
Sunset Colony Unapproved Roundup · Musselshell County |
75 | 1 | 0 | |
|
Swlo and Main Office Missoula · Missoula County |
75 | 7 | 0 | |
|
Tamarack Court Missoula · Missoula County |
75 | 1 | 0 | |
|
Valley Fuel and Supply Savage · Richland County |
75 | 1 | 0 | |
|
Victor Sinclair Victor · Ravalli County |
75 | 0 | 0 | |
|
Western Mobile Village Dillon Dillon · Beaverhead County |
75 | 2 | 0 | |
|
Atanaha Event Center Flathead County |
74 | 1 | 0 | |
|
Dayton School County |
74 | 0 | 0 | |
|
Fedex Relay Center Billings · Yellowstone County |
74 | 2 | 0 | |
|
Mvp Holding LLC Missoula · Missoula County |
74 | 2 | 1 | |
|
Theiltges Saint Thomas Camp Great Falls · Cascade County |
74 | 1 | 0 | |
|
Bison Inn Cafe Ravalli · Lake County |
73 | 1 | 0 | |
|
Hartland Colony Havre · Blaine County |
73 | 5 | 1 | |
|
Montana Trailer Court Missoula · Missoula County |
73 | 1 | 0 | |
|
Turah Meadows Missoula · Missoula County |
73 | 1 | 1 | |
|
Bitterroot Valley RV Park & Campground Hamilton · Ravalli County |
72 | 0 | 0 | |
|
Camp Child Elliston · Powell County |
72 | 3 | 1 | |
|
Dixon (old Agency) County |
72 | 2 | 0 | |
|
Lamotte School District NO 43 Bozeman · Gallatin County |
72 | 0 | 0 | |
|
Mission Country Market St Ignatius · Lake County |
72 | 2 | 0 | |
|
Polebridge Mercantile Polebridge · Flathead County |
72 | 2 | 1 | |
|
Alcan Bar and Cafe Frenchtown · Missoula County |
71 | 0 | 0 | |
|
Evaro Bar and Casino Missoula · Missoula County |
71 | 0 | 0 | |
|
Western Livestock Auction LLC Great Falls · Cascade County |
71 | 1 | 0 | |
|
Airport Industrial Building Unapproved Stevensville · Ravalli County |
70 | 1 | 0 | |
|
All West Business Park Lot 3 Bozeman · Gallatin County |
70 | 4 | 0 | |
|
Barnett Water Users System Helena · Lewis and Clark County |
70 | 6 | 0 | |
|
Big Sky Trailer CT Hamilton Hamilton · Ravalli County |
70 | 0 | 0 | |
|
Clear View Academy Heron · Sanders County |
70 | 0 | 0 | |
|
Deer Lick Subdivision Water District Haugan · Mineral County |
70 | 2 | 0 | |
|
Duck Creek Mobile Home Park Billings · Yellowstone County |
70 | 5 | 0 | |
|
Emerald Heights HOA Water & Sewer Dist Whitefish · Flathead County |
70 | 2 | 0 | |
|
Emmanuel Lutheran Church Shepherd · Yellowstone County |
70 | 1 | 1 | |
|
Ethridge County Water District Shelby · Toole County |
70 | 2 | 1 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
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.