County Water Quality Report

New Haven County, Connecticut

3 public water systems serving 584,612 residents

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
County average grade
F
54/100
Utilities rated 3
Population served 584,612
🇪🇺 Would fail EU standards 1 of 3

Top water quality concerns in New Haven County

  • PFAS contaminationin 3 of 3 utilities
  • Haloacetic acids (HAA9) significantly above health guidelinein 3 of 3 utilities
  • Total trihalomethanes (TTHMs) significantly above health guidelinein 3 of 3 utilities
  • Haloacetic acids (HAA5) significantly above health guidelinein 3 of 3 utilities

All utilities in New Haven County

Click any utility for full grade card, contaminant data, and treatment plant contact info.

D
55/100

REGIONAL WATER AUTHORITY

ANSONIA · 418,900 residents

Top concern: PFAS contamination

View report →
D
55/100

WATERBURY WATER DEPARTMENT

MIDDLEBURY · 107,271 residents

Top concern: PFAS contamination

View report →
F
53/100

MERIDEN WATER DIVISION

BERLIN · 58,441 residents

Top concern: PFAS contamination

View report →