Big Horn County, Montana
23 active water systems in this county.
| Water System | Population Served | Source | Violations | Health-Based |
|---|---|---|---|---|
| Yellowtail Dam Powerplant and Visitor Ce | 48 | Surface Water | 16 | 4 |
| Absaloka Mine | 80 | Surface Water Purchased | 8 | 3 |
| Cottonwood Camp Fort Smith | 85 | Groundwater | 9 | 2 |
| Chief Plenty Coups Museum | 262 | Groundwater | 5 | 1 |
| Spring Creek Coal Domestic | 200 | Groundwater | 5 | 1 |
| Lodge Grass Town of | 480 | Groundwater | 121 | 0 |
| St Charles School | 152 | Groundwater | 111 | 0 |
| Wegner Water Service Hauler | 50 | Surface Water Purchased | 84 | 0 |
| Kirby Saloon | 25 | Groundwater | 80 | 0 |
| Hardin City of | 3,500 | Surface Water | 13 | 0 |
| Little Bighorn Battlefield Nm | 2,020 | Groundwater | 13 | 0 |
| 7th Ranch Rv Camp | 102 | Groundwater | 13 | 0 |
| Hardin Koa Cistern | 100 | Surface Water Purchased | 13 | 0 |
| East Decker Coal Mine | 28 | Groundwater | 12 | 0 |
| Yellowtail Dam Gc System | 125 | Groundwater | 11 | 0 |
| Fort Smith Water and Sewer District | 450 | Groundwater | 9 | 0 |
| Spring Creek Mine | 200 | Surface Water Purchased | 6 | 0 |
| Hardin Westbound Rest Area | 715 | Groundwater | 5 | 0 |
| Hardin Eastbound Rest Area | 877 | Groundwater | 4 | 0 |
| Tongue River Pee Wee Point | 300 | Groundwater | 3 | 0 |
| Tongue River Campers Point | 305 | Groundwater | 2 | 0 |
| Big Horn Co Historical Museum | 206 | Surface Water Purchased | 1 | 0 |
| Reese and Ray Iga Hardin | 25 | Surface Water Purchased | 0 | 0 |