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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 10 counties in Massachusetts
10 counties ranked by average water quality score
| Rank | County | Avg Score | Grade | Cities | Population | Score Range |
|---|---|---|---|---|---|---|
| 1 | Worcester County | 89 | A- | 3 | 291,686 | 85 - 94 |
| 2 | Plymouth County | 87 | A- | 1 | 105,643 | 87 - 87 |
| 3 | Berkshire County | 87 | A- | 1 | 42,514 | 87 - 87 |
| 4 | Bristol County | 86 | A- | 4 | 300,525 | 73 - 96 |
| 5 | Middlesex County | 84 | B+ | 18 | 1,029,333 | 65 - 96 |
| 6 | Suffolk County | 84 | B+ | 3 | 795,573 | 77 - 88 |
| 7 | Barnstable County | 84 | B+ | 1 | 44,641 | 84 - 84 |
| 8 | Norfolk County | 80 | B+ | 7 | 360,240 | 54 - 96 |
| 9 | Essex County | 79 | B | 8 | 489,442 | 67 - 95 |
| 10 | Hampden County | 78 | B | 4 | 290,656 | 67 - 90 |
3 cities • 291,686 residents
1 cities • 105,643 residents
1 cities • 42,514 residents
4 cities • 300,525 residents
18 cities • 1,029,333 residents
3 cities • 795,573 residents
1 cities • 44,641 residents
7 cities • 360,240 residents
8 cities • 489,442 residents
4 cities • 290,656 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 10 counties and 50 cities analyzed, this data helps residents understand regional water quality patterns in Massachusetts. County scores range from 54/100 to 96/100, 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.