Massachusetts Water Quality
Drinking water data for all 14 counties.
Avg Water Score
69.1
State Grade
C
Counties with Data
14
of 14 total
All Massachusetts Counties
| County | Water Score |
|---|---|
| Dukes County | 86.0 |
| Nantucket County | 86.0 |
| Suffolk County | 86.0 |
| Barnstable County | 71.5 |
| Essex County | 70.4 |
| Middlesex County | 68.0 |
| Hampshire County | 67.5 |
| Hampden County | 66.4 |
| Plymouth County | 64.5 |
| Norfolk County | 63.8 |
| Worcester County | 63.5 |
| Berkshire County | 60.6 |
| Bristol County | 60.4 |
| Franklin County | 53.4 |
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Frequently Asked Questions
Which county in Massachusetts has the best water quality?
Dukes County has the highest water quality score in Massachusetts at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Massachusetts has the most water violations?
Franklin County has among the lowest water quality scores in Massachusetts at 53.4/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Massachusetts?
Massachusetts has an average water quality score of 69.1/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Massachusetts water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.