330 active public water systems serve 108,099 people in Flathead County. 204 are compliant, 126 had at least one EPA violation in the past three years, 0 are designated serious violators, and 4 carry a health flag.
Active systems330142 community systems
People served108Kby public water systems
Systems with violations12638% of active systems, past 3 years
Serious violators04 systems carry a health flag
Needs attention
Amazing Ventures INCMT0004341 · Coram · Transient non-community system · Serves 1301 rule violated in the past three years. Unresolved: Revised Total Coliform Rule (RTCR).
North Forty ResortMT0003686 · Whitefish · Transient non-community system · Serves 1301 rule violated in the past three years. Unresolved: Revised Total Coliform Rule (RTCR).
Polebridge MercantileMT0002811 · Polebridge · Transient non-community system · Serves 722 rules violated in the past three years. Unresolved: Revised Total Coliform Rule (RTCR).
Essex County Water and or Sewer DistrictMT0000209 · Essex · Transient non-community system · Serves 521 rule violated in the past three years. Unresolved: Surface Water Treatment Rule (SWTR).
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.
Compliant
Compliant
No violations reported to EPA in the past three years.
At least one violation on record with EPA in the past three years. Many are monitoring or reporting lapses rather than contamination; the system page lists which rules were involved and whether each is still open.
EPA's designation, also called an enforcement priority, for a system with unresolved serious, multiple, or continuing violations. EPA expects the system and its state to act quickly to resolve them.
At least one open health-based violation: an exceedance of a maximum contaminant level or residual disinfectant level, or a treatment technique violation. Monitoring and reporting lapses do not raise this flag.