Water quality in Hardin, Montana
Hardin is in Big Horn County. 23 active public water systems serve the county; 14 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Big Horn County
4 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Yellowtail Dam GC System Hardin |
125 | 2 | 1.5 mi | |
| Wegner Water Service Hauler Hardin |
50 | 3 | 7.3 mi | |
| Fort Smith Water and Sewer District Fort Smith |
450 | 0 | 33.1 mi | |
| Lodge Grass Town of Lodge Grass |
480 | 2 | 39.6 mi |
Non-community systems in Big Horn County (18: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Hardin KOA Cistern Hardin |
100 | 1 | 1 | |
|
Yellowtail Dam Powerplant and Visitor CE Hardin |
48 | 0 | 0 | |
|
Reese and Ray Iga Hardin Hardin |
25 | 0 | 0 | |
|
Big Horn CO Historical Museum Hardin |
206 | 0 | 0 | |
|
Little Bighorn Battlefield NM Crow Agency |
2,020 | 0 | 0 | |
|
Hardin Eastbound Rest Area Hardin |
877 | 1 | 0 | |
|
Hardin Westbound Rest Area Hardin |
715 | 2 | 0 | |
|
7th Ranch RV Camp Garryowen |
102 | 1 | 0 | |
|
Absaloka Mine Hardin |
80 | 2 | 0 | |
|
Cottonwood Camp Fort Smith Fort Smith |
85 | 3 | 1 | |
|
Kirby Saloon Busby |
25 | 3 | 1 | |
|
Chief Plenty Coups Museum Pryor |
262 | 0 | 0 | |
|
ST Charles School Pryor |
152 | 1 | 1 | |
|
Spring Creek Coal Domestic Decker |
200 | 1 | 0 | |
|
Spring Creek Mine Decker |
200 | 0 | 0 | |
|
Tongue River Campers Point Decker |
305 | 0 | 0 | |
|
Tongue River Pee Wee Point Decker |
300 | 0 | 0 | |
|
East Decker Coal Mine Decker |
28 | 2 | 0 |
About this data
Water systems are matched to Big Horn County, nearest to Hardin first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 files.
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. Retrieved from ECHO on Oct 11, 2026.