Public Water Systems
2,263 active public water systems in MT, tracked from EPA's Safe Drinking Water Information System (SDWIS) across all 50 states. See our methodology.
| System Name | Location | Population | Violations | PFAS |
| Mobile City Trailer Court | Missoula, MT | 175 | 773 | - |
| Cinnabar The | Gardiner, MT | 175 | 127 | - |
| Clydehurst Christian Ranch | Billings, MT | 175 | 48 | - |
| Town View Estates Wua Inc | Helena, MT | 175 | 24 | - |
| Mountain Heritage Water System | Helena, MT | 175 | 103 | - |
| Summit House Restaurant | Whitefish, MT | 175 | 16 | - |
| Arlee Junior High School | Arlee, MT | 175 | 236 | - |
| Kootenai Creek Village | Hamilton, MT | 175 | 56 | - |
| Big Sky SD Ophir Elementary School | Big Sky, MT | 175 | 18 | - |
| Hellgate Campground | Helena, MT | 175 | 52 | - |
| Westby Town Of | Westby, MT | 172 | 611 | - |
| Florence Carlton Community Church | Florence, MT | 172 | 36 | - |
| Melstone Town Of | Melstone, MT | 170 | 440 | - |
| Mountain States Leasing Butte LLC | Butte, MT | 170 | 129 | - |
| Hoving Business Center | Helena, MT | 170 | 702 | - |
| Phillips County Zortman Water and Sewer | Zortman, MT | 169 | 149 | - |
| Owl Creek Holland Lake | Kalispell, MT | 169 | 28 | - |
| Jim and Marys RV Park | Missoula, MT | 166 | 95 | - |
| Hawthorn Springs Property Owners Assoc | Missoula, MT | 165 | 75 | - |
| Rock Creek Cattle Company | Deer Lodge, MT | 165 | 38 | - |
| Bozeman Brick Block and Tile | Bozeman, MT | 165 | 22 | - |
| Grandview Trailer Court | Port Orchard, MT | 165 | 4 | - |
| Hamilton Murdochs | Missoula, MT | 164 | 0 | - |
| Greenland Mobile Home Park | Missoula, MT | 163 | 456 | - |
| Prairie Mobile Village | Helena, MT | 163 | 20 | - |
| Lodge at McGregor Lake The | Marion, MT | 163 | 77 | - |
| Dickey Lake Bible Camp Trego | Trego, MT | 163 | 97 | - |
| Fox Hill Estates | Kalispell, MT | 163 | 108 | - |
| Spring Meadows County Water District | Missoula, MT | 162 | 320 | - |
| Yellowstones Edge RV Park | Livingston, MT | 162 | 26 | - |
| Eagle Mount | Bozeman, MT | 161 | 226 | - |
| Pinewood Village | Libby, MT | 160 | 65 | - |
| Rexford Town Of | Rexford, MT | 160 | 62 | - |
| Emkayan Village Co Water and Sewer Dist | Libby, MT | 160 | 77 | - |
| Potomac School Dist 11 | Bonner, MT | 160 | 141 | - |
| Kila School District No 20 | Kalispell, MT | 160 | 27 | - |
| New Rockport Colony Inc | Choteau, MT | 160 | 158 | - |
| Golden Sunlight Mines Inc | Whitehall, MT | 160 | 536 | - |
| Lds Church Drummond | Corvallis, MT | 160 | 58 | - |
| Wingate by Wyndham | Butte, MT | 160 | 52 | - |
| Sunhaven Mobile Home Park | Dallas, MT | 160 | 62 | - |
| Aunties Emporium | Arlee, MT | 160 | 88 | - |
| Liberty Baptist Church | East Helena, MT | 160 | 7 | - |
| Family Dollar Helena 13446 Unapproved | Perry, MT | 160 | 18 | - |
| Hangmans Tree Wua | Clancy, MT | 158 | 55 | - |
| Echo Lake Cafe | Big Fork, MT | 158 | 67 | - |
| Yellowstone Alliance Adventures | Bozeman, MT | 158 | 87 | - |
| Sunrise Cafe | Kalispell, MT | 157 | 17 | - |
| Goose Bay Marina Inc | Bozeman, MT | 156 | 10 | - |
| Bowers Market Victor | Victor, MT | 156 | 39 | - |