Water quality in Boulder, Montana
Boulder is in Jefferson County. 42 active public water systems serve the county; 27 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Jefferson County
13 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Basin County Water and Sewer Dist Basin |
200 | 2 | 7.6 mi | |
| Rocky Mountain Wua Clancy |
30 | 3 | 12.3 mi | |
| Elkhorn Health and Rehabilitation LLC Clancy |
89 | 3 | 16.5 mi | |
| Red Cliff Estates HOA Clancy |
48 | 2 | 16.5 mi | |
| Forest Park Water Users Association Clancy |
323 | 1 | 20.1 mi | |
| Blue Sky Heights Wua Clancy Clancy |
250 | 4 | 20.5 mi | |
| Hangmans Tree Wua Clancy |
158 | 0 | 21.0 mi | |
| Stoney Brook Village Condominium Assoc Clancy |
142 | 2 | 22.4 mi | |
| Jefferson Tracts Assoc INC Clancy |
80 | 2 | 22.7 mi | |
| Jefferson Hills Wua Helena |
780 | 3 | 23.1 mi | |
| Saddle Mountain Corp Clancy Clancy |
350 | 0 | 23.1 mi | |
| Whitehall Town of Whitehall |
1,500 | 3 | 24.5 mi | |
| Sunnybrook Acres HOA East Helena |
50 | 0 | 25.0 mi |
Non-community systems in Jefferson County (28: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Jefferson County, nearest to Boulder 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.