Water quality for ZIP code 59631
ZIP 59631 covers Basin in Jefferson County, Montana, one of 6 ZIP codes in the county. 42 active public water systems serve the county; 27 had an EPA violation in the past three years.
Most likely your provider
Other community water systems in Jefferson County
13 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Boulder City of Boulder |
1,400 | 2 | 16.3 mi | |
| Rocky Mountain Wua Clancy |
30 | 3 | 20.1 mi | |
| Elkhorn Health and Rehabilitation LLC Clancy |
89 | 3 | 22.5 mi | |
| Red Cliff Estates HOA Clancy |
48 | 2 | 22.5 mi | |
| Forest Park Water Users Association Clancy |
323 | 1 | 25.3 mi | |
| Blue Sky Heights Wua Clancy Clancy |
250 | 4 | 25.6 mi | |
| Hangmans Tree Wua Clancy |
158 | 0 | 26.4 mi | |
| Jefferson Tracts Assoc INC Clancy |
80 | 2 | 26.9 mi | |
| Stoney Brook Village Condominium Assoc Clancy |
142 | 2 | 27.3 mi | |
| Jefferson Hills Wua Helena |
780 | 3 | 27.5 mi | |
| Saddle Mountain Corp Clancy Clancy |
350 | 0 | 27.8 mi | |
| Sunnybrook Acres HOA East Helena |
50 | 0 | 29.8 mi | |
| Whitehall Town of Whitehall |
1,500 | 3 | 35.2 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, the county this ZIP code lies in, nearest to the ZIP code's centre 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.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA 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.