170 active public water systems serve 92,670 people in Penobscot County. 54 are compliant, 116 had at least one EPA violation in the past three years, 3 are designated serious violators, and 5 carry a health flag.
Active systems17054 community systems
People served93Kby public water systems
Systems with violations11668% of active systems, past 3 years
Serious violators35 systems carry a health flag
Needs attention
Hermon Meadows Golf CourseME0007346 · Hermon · Transient non-community system · Serves 1603 rules violated in the past three years. Unresolved: Public Notice Rule and Revised PN Rule.
Endless Trails LLCME0094868 · Patten · Transient non-community system · Serves 643 rules violated in the past three years. Unresolved: Public Notice Rule and Revised PN Rule.
M & M Lakeside Camping AreaME0011700 · Enfield · Transient non-community system · Serves 303 rules violated in the past three years. Unresolved: Revised Total Coliform Rule.
Mattawamkeag Wilderness ParkME0008854 · Mattawamkeag · Transient non-community system · Serves 1452 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.
Thornton Family CampgroundME0092550 · Orrington · Transient non-community system · Serves 1402 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Public Notice Rule and Revised PN Rule.
Northern Light Family Medicine OronoME0092565 · Orono · Transient non-community system · Serves 892 rules violated in the past three years. Unresolved: Revised Total Coliform Rule and Ground Water Rule.
Danforth PlazaME0094952 · Hermon · Non-Transient non-community system · Serves 472 rules violated in the past three years. Unresolved: Lead and Copper Rule.
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 Maine 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.