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 |
| Lone Pine Montana State Park | Kalispell, MT | 64 | 42 | - |
| Canoe Gulch Ranger Station | Libby, MT | 64 | 41 | - |
| Foxys Bar & RV Park | Libby, MT | 63 | 87 | - |
| Ramble Inn Bar | Sun River, MT | 63 | 145 | - |
| First and Last Chance Bar | Eureka, MT | 63 | 27 | - |
| Cardwell School Dist 16 and 31 | Cardwell, MT | 63 | 125 | - |
| Town Pump Big Timber Super 8 | Butte, MT | 63 | 43 | - |
| Driftwaters Resort | Cameron, MT | 63 | 223 | - |
| South Eighty Water | Lakeside, MT | 63 | 20 | - |
| East Valley Estates | Kalispell, MT | 63 | 9 | - |
| Ponderosa Investment Inc | St Regis, MT | 63 | 15 | - |
| McAllister Lodging | Ennis, MT | 63 | 47 | - |
| Diamond Motel and Campground LLC | Terry, MT | 62 | 39 | - |
| Two Rivers RV Park | Noxon, MT | 62 | 50 | - |
| Kirkwood Shores Subdivision | Lewistown, MT | 62 | 32 | - |
| Polebridge Ranger Station | West Glacier, MT | 62 | 7 | - |
| Sundance Campground | Coram, MT | 62 | 14 | - |
| Motel 6 Travel Plaza Wye | Missoula, MT | 62 | 31 | - |
| Clarks Lookout | Dillon, MT | 62 | 281 | - |
| Silver Tip Junction | Noxon, MT | 62 | 41 | - |
| Lake County Transfer Station | Ronan, MT | 62 | 119 | - |
| Vista Motel | West Glacier, MT | 61 | 119 | - |
| Sleeping Giant Trade Center | Livingston, MT | 61 | 27 | - |
| Yellowstone Ice and Water | Billings, MT | 61 | 179 | - |
| Great Beginnings Montessori School | Bozeman, MT | 61 | 27 | - |
| Glacier Conference Center | Lakeside, MT | 61 | 16 | - |
| Lodgepole Campground | Philipsburg, MT | 61 | 12 | - |
| Strobel Trailer Court | Big Timber, MT | 60 | 10 | - |
| Rivers Edge Mobile Park Libby | Libby, MT | 60 | 1,177 | - |
| Birdland Bay RV Resort | Thompson Falls, MT | 60 | 18 | - |
| Florence Baptist Church | Florence, MT | 60 | 21 | - |
| Willow Creek School Dist No 15 | Willow Creek, MT | 60 | 447 | - |
| Tall Boys Tavern | Hobson, MT | 60 | 95 | - |
| Twin Acres Trailer Court | Stevensville, MT | 60 | 44 | - |
| Elk Creek Mennonite Church | Fort Shaw, MT | 60 | 163 | - |
| Ponderosa Mobile Home Park | Hamilton, MT | 60 | 49 | - |
| Northwest Paint Inc | Missoula, MT | 60 | 31 | - |
| Fox Water Service Incorporated | Laurel, MT | 60 | 5 | - |
| South Hills Water Users Association | Polson, MT | 60 | 391 | - |
| Hook U Up RV Park Libby | High River, MT | 60 | 35 | - |
| Halfmoon Mobile Home Park Inc | Columbia Falls, MT | 60 | 9 | - |
| Water Resources Division | Missoula, MT | 60 | 381 | - |
| Bonnie's Place, Inc. | Missoula, MT | 60 | 539 | - |
| Blue Grass Water Users Association | Billings, MT | 60 | 180 | - |
| Elevate Church | Missoula, MT | 60 | 40 | - |
| Blue Cloud Subdivision | Helena, MT | 60 | 352 | - |
| Kid Corral Day Care | Shepherd, MT | 60 | 692 | - |
| Sanders Water System | Arlee, MT | 60 | 221 | - |
| Big Stack Estates | Helena, MT | 60 | 7 | - |
| 99 Life Link Way | Alta, MT | 60 | 16 | - |