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 |
| Lazy J South Subdivision | Big Sky, MT | 122 | 3 | - |
| Placid Lake State Park | Missoula, MT | 122 | 32 | - |
| Lubrecht Experimental Forest | Greenough, MT | 121 | 350 | - |
| Creston School District 9 | Kalispell, MT | 121 | 12 | - |
| Big Sky Bible Camp | Big Fork, MT | 121 | 6 | - |
| Dodson Town Of | Dodson, MT | 120 | 718 | - |
| Longbranch Casino | Ballantine, MT | 120 | 621 | - |
| Travelers Rest Ropers Lounge | Lolo, MT | 120 | 72 | - |
| Joe & Dee's | Glendive, MT | 120 | 346 | - |
| Arrowhead School District No 75 | Belgrade, MT | 120 | 834 | - |
| Birch Creek Colony | Valier, MT | 120 | 170 | - |
| Kingsbury Colony | Valier, MT | 120 | 210 | - |
| Bitterroot Meadows HOA Lolo | Lolo, MT | 120 | 54 | - |
| Pleasant Valley Colony | Belt, MT | 120 | 25 | - |
| Coal Banks Landing Blm | Fort Benton, MT | 120 | 63 | - |
| Triple Creek Ranch | Darby, MT | 120 | 74 | - |
| Ace Hardware North Helena | East Helena, MT | 120 | 7 | - |
| Meadow Brook Park | Missoula, MT | 120 | 68 | - |
| Wild Flower HOA, The | Hamilton, MT | 120 | 19 | - |
| Hoopers Garden Center | Kalispell, MT | 120 | 33 | - |
| Madison Valley Baptist Church Unapproved | Ennis, MT | 120 | 16 | - |
| Belgrade King Hall Jehovah Witn Unapprov | Belgrade, MT | 120 | 70 | - |
| Holbrook Estates | Kalispell, MT | 120 | 1 | - |
| Finley Point Mt State Park | Kalispell, MT | 120 | 13 | - |
| Jerrys Saloon | Fortine, MT | 119 | 99 | - |
| Wettington Water District Inc | Kalispell, MT | 119 | 278 | - |
| Northwest Water Treatment Co | Bozeman, MT | 118 | 95 | - |
| Papa Rays Casino and Hugos Pizza | East Helena, MT | 118 | 57 | - |
| Mission Mountain Lake Co W and S Dist | Ronan, MT | 118 | 14 | - |
| Northwest Indian Bible School | Alberton, MT | 118 | 163 | - |
| Roosville Border Station | Helena, MT | 117 | 110 | - |
| Madison Arm Resort | West Yellowstone, MT | 117 | 18 | - |
| Woolzies Willow Creek Cafe | Harrison, MT | 117 | 433 | - |
| Tally Lake Campground | Kalispell, MT | 117 | 17 | - |
| Seville Colony | Cut Bank, MT | 116 | 254 | - |
| Kopper Kitchen | Kalispell, MT | 116 | 53 | - |
| Yacht Basin Marina and Tr CT | Livingston, MT | 115 | 55 | - |
| Valley West Trailer Court | Lolo, MT | 115 | 54 | - |
| Woodside Park County Water and Sewer Dis | Thoimpson Falls, MT | 115 | 39 | - |
| Jackson Creek Bar and Grille | Clancy, MT | 115 | 279 | - |
| Terry Downtown Wua | Miles City, MT | 115 | 77 | - |
| Clinton Market | Missoula, MT | 115 | 0 | - |
| Centennial Homeowner's Association, Inc | Corvallis, MT | 115 | 25 | - |
| Eagle Ridge Estates Co W and S Dist | Kalispell, MT | 115 | 18 | - |
| Riverwalk and Dinos Estates | Missoula, MT | 115 | 246 | - |
| St Anthony Orthodox Church | Bozeman, MT | 115 | 14 | - |
| Camp Mak-A-Dream | Gold Creek, MT | 115 | 8 | - |
| Sidney Richland County Airport Unapprove | Sidney, MT | 115 | 24 | - |
| Savage Public School | Savage, MT | 114 | 309 | - |
| L and C Caverns State Park Cg | Whitehall, MT | 114 | 15 | - |