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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 9 counties in Massachusetts
9 counties ranked by average water quality score
| Rank | County | Avg Score | Grade | Cities | Population | Score Range |
|---|---|---|---|---|---|---|
| 1 | Plymouth County | 100 | A | 1 | 105,788 | 100 - 100 |
| 2 | Berkshire County | 100 | A | 1 | 43,927 | 100 - 100 |
| 3 | Hampden County | 98 | A | 4 | 303,662 | 96 - 100 |
| 4 | Norfolk County | 91 | A | 6 | 316,426 | 74 - 100 |
| 5 | Bristol County | 91 | A | 4 | 303,705 | 74 - 100 |
| 6 | Suffolk County | 91 | A | 3 | 778,620 | 77 - 100 |
| 7 | Middlesex County | 90 | A | 18 | 1,031,858 | 57 - 100 |
| 8 | Worcester County | 90 | A | 3 | 290,147 | 83 - 98 |
| 9 | Essex County | 86 | B | 8 | 576,442 | 58 - 100 |
3 cities • 778,620 residents
18 cities • 1,031,858 residents
3 cities • 290,147 residents
8 cities • 576,442 residents
Our county-level water quality analysis aggregates data from municipal water systems across Massachusetts. Each county's score represents the average water quality across all analyzed cities within that county, weighted by population served.
With 9 counties and 48 cities analyzed, this data helps residents understand regional water quality patterns in Massachusetts. County scores range from 57/100 to 100/100, reflecting the diversity of water sources and treatment infrastructure across the state.
All analyzed counties in Massachusetts 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.