Montana
Jefferson County drinking water quality
42 active public water systems serve 10,189 people in Jefferson County. 15 are compliant, 27 had at least one EPA violation in the past three years, 0 are designated serious violators, and 1 carries a health flag.
Needs attention
Community water systems
14 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Whitehall Town of Whitehall |
1,500 | 3 | 0 | |
|
Boulder City of Boulder |
1,400 | 2 | 1 | |
|
Jefferson Hills Wua Helena |
780 | 3 | 1 | |
|
Saddle Mountain Corp Clancy Clancy |
350 | 0 | 0 | |
|
Forest Park Water Users Association Clancy |
323 | 1 | 0 | |
|
Blue Sky Heights Wua Clancy Clancy |
250 | 4 | 1 | |
|
Basin County Water and Sewer Dist Basin |
200 | 2 | 1 | |
|
Hangmans Tree Wua Clancy |
158 | 0 | 0 | |
|
Stoney Brook Village Condominium Assoc Clancy |
142 | 2 | 1 | |
|
Elkhorn Health and Rehabilitation LLC Clancy |
89 | 3 | 0 | |
|
Jefferson Tracts Assoc INC Clancy |
80 | 2 | 0 | |
|
Sunnybrook Acres HOA East Helena |
50 | 0 | 0 | |
|
Red Cliff Estates HOA Clancy |
48 | 2 | 0 | |
|
Rocky Mountain Wua Clancy |
30 | 3 | 0 |
Non-community systems (28: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (25, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.