Water quality in Harrison, Montana
Harrison is in Madison County. 46 active public water systems serve the county; 29 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Madison County
11 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Ennis Town of Ennis |
1,400 | 1 | 24.2 mi | |
| Sheridan Town of Sheridan |
632 | 5 | 25.7 mi | |
| Twin Bridges Town of Twin Bridges |
424 | 0 | 28.3 mi | |
| Virginia City Water Dept Virginia City |
1,500 | 3 | 28.6 mi | |
| Big Sky County Water and Sewer Dist 363 Big Sky |
4,132 | 1 | 36.0 mi | |
| Encampment Trail Big Sky |
100 | 0 | 36.6 mi | |
| Lower Pioneer Mountain Water System Big Sky |
350 | 0 | 37.0 mi | |
| Andesite Ridge Water System Big Sky |
450 | 0 | 37.4 mi | |
| MT Moonlight Basin Big Sky |
355 | 0 | 37.4 mi | |
| Spanish Peaks Mountain Club Big Sky |
40 | 0 | 37.4 mi | |
| Lone View Ridge Water System Big Sky |
37 | 0 | 37.4 mi |
Non-community systems in Madison County (34: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Madison County, nearest to Harrison 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.