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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Compare water quality across 6 counties in Connecticut
6 counties ranked by average water quality score
| Rank | County | Avg Score | Grade | Cities | Population | Score Range |
|---|---|---|---|---|---|---|
| 1 | Middlesex County | 94 | A | 1 | 46,406 | 94 - 94 |
| 2 | New London County | 84 | B+ | 3 | 104,524 | 72 - 94 |
| 3 | New Haven County | 83 | B+ | 8 | 479,861 | 68 - 97 |
| 4 | Litchfield County | 83 | B+ | 1 | 34,319 | 83 - 83 |
| 5 | Hartford County | 80 | B+ | 6 | 382,192 | 68 - 95 |
| 6 | Fairfield County | 80 | B+ | 6 | 555,473 | 67 - 88 |
1 cities • 46,406 residents
3 cities • 104,524 residents
8 cities • 479,861 residents
1 cities • 34,319 residents
6 cities • 382,192 residents
6 cities • 555,473 residents
Our county-level water quality analysis aggregates data from municipal water systems across Connecticut. Each county's score represents the average water quality across all analyzed cities within that county, weighted by population served.
With 6 counties and 25 cities analyzed, this data helps residents understand regional water quality patterns in Connecticut. County scores range from 67/100 to 97/100, reflecting the diversity of water sources and treatment infrastructure across the state.
All analyzed counties in Connecticut maintain average scores above 70, indicating generally acceptable water quality standards statewide. Individual city scores may vary, so residents should still review their specific city's report.