278 active public water systems serve 97,827 people in Middlesex County. 129 are compliant, 149 had at least one EPA violation in the past three years, 7 are designated serious violators, and 44 carry a health flag.
Active systems27850 community systems
People served98Kby public water systems
Systems with violations14954% of active systems, past 3 years
Serious violators744 systems carry a health flag
Needs attention
East Hampton Middle SchoolCT0420912 · East Hampton · Non-Transient non-community system · Serves 4872 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Goodspeed Opera HouseCT0410334 · East Haddam · Non-Transient non-community system · Serves 1503 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Essex GardensCT0500021 · Essex · Community water system · Serves 723 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Goodspeed Actor Housing the VillageCT0419211 · East Haddam · Community water system · Serves 406 rules violated in the past three years. Unresolved: Arsenic, Consumer Confidence Rule (CCR), Lead and Copper Rule (LCR), and Lead and Copper Rule Revisions (LCRR).
Ridgewood Hills Association System 1CT0361011 · Deep River · Community water system · Serves 362 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
31 Grist Mill RDCT0419221 · East Haddam · Community water system · Serves 305 rules violated in the past three years. Unresolved: Groundwater Rule (GWR), Lead and Copper Rule Revisions (LCRR), Public Notification Rule, and Revised Total Coliform Rule (RTCR).
22 New Haven RoadCT0380074 · Durham · Transient non-community system · Serves 252 rules violated in the past three years. Unresolved: Public Notification Rule and Revised Total Coliform Rule (RTCR).
Nathan Hale-Ray Middle SchoolCT0419193 · East Haddam · Non-Transient non-community system · Serves 6201 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
East Haddam Elementary SchoolCT0419013 · East Haddam · Non-Transient non-community system · Serves 6001 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
East Hampton High SchoolCT0420902 · East Hampton · Non-Transient non-community system · Serves 5682 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
34 more systems with a serious violator or health flag designation are in the lists below.
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 Connecticut 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.