Montana has 2,220 active public water systems regulated under the EPA's Safe Drinking Water Act. Across these systems, there have been 2,575 health-based violations out of 39,019 total violations recorded. Currently, 72 water systems have unresolved health-based violations.
The most frequently cited health-based contaminants in Montana are Unknown, Unknown, and Unknown. Health-based violations mean a water system exceeded an EPA maximum contaminant level (MCL) or failed required treatment standards.
Browse the counties below to find specific water systems, or search by address or ZIP code to find your water provider.