Connecticut County Water Quality Reports
Water quality reports for all counties in Connecticut. Browse by county to see safety scores, violations, and ZIP code data.
Browse water quality data by county in Connecticut. Each county page lists all ZIP codes with safety scores and EPA violation data.
Fairfield County, CT: 44 Health Violations — 58/100 (2026)
2026 report: Fairfield County, CT scores 58/100 (Grade C). 65 ZIP codes analyzed. 1035 EPA violations found. Free report with contaminant data and filte...
Hartford County, CT: 88 Health Violations — 83/100 (2026)
2026 report: Hartford County, CT scores 83/100 (Grade B). 103 ZIP codes analyzed. 429 EPA violations found. Free report with contaminant data and filter...
Litchfield County, CT: 17 Health Violations — 67/100 (2026)
2026 report: Litchfield County, CT scores 67/100 (Grade C). 54 ZIP codes analyzed. 269 EPA violations found. Free report with contaminant data and filte...
Middlesex County, CT: 24 Health Violations — 50/100 (2026)
2026 report: Middlesex County, CT scores 50/100 (Grade D). 37 ZIP codes analyzed. 190 EPA violations found. Free report with contaminant data and filter...
New Haven County, CT: 52 Health Violations — 58/100 (2026)
2026 report: New Haven County, CT scores 58/100 (Grade C). 80 ZIP codes analyzed. 585 EPA violations found. Free report with contaminant data and filter...
New London County, CT: 35 Health Violations — 55/100 (2026)
2026 report: New London County, CT scores 55/100 (Grade C). 34 ZIP codes analyzed. 255 EPA violations found. Free report with contaminant data and filte...
Tolland County, CT: 30 Health Violations — 64/100 (2026)
2026 report: Tolland County, CT scores 64/100 (Grade C). 22 ZIP codes analyzed. 112 EPA violations found. Free report with contaminant data and filter p...
Windham County, CT: 53 Health Violations — 62/100 (2026)
2026 report: Windham County, CT scores 62/100 (Grade C). 38 ZIP codes analyzed. 186 EPA violations found. Free report with contaminant data and filter p...
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