Massachusetts drinking water quality
Massachusetts has 1,613 active public water systems serving 11.1 million people. 480 of them, 30%, had at least one EPA violation in the past three years, 270 have an unresolved violation today, and 7 are designated serious violators by the EPA.
Active systems
1,613
in 14 counties
People served
11.1M
529 community systems serve 10.8M
Violations, past 3 years
480
30% of active systems
Serious violators
7
52 systems carry a health flag
Largest counties
All 14 countiesLargest community water systems
All 1,613 systems| System | Serves | Status |
|---|---|---|
| Mwra Suffolk County |
2,580,000 | |
| Tri Town Water Board Norfolk County |
856,000 | |
| Boston Water and Sewer Commission (mwra) Suffolk County |
675,647 | |
| Worcester Dpwp, Water Supply Division Worcester County |
206,518 | |
| Springfield Water and Sewer Commission Hampden County |
169,170 | |
| Lowell Regional Water Utility Middlesex County |
120,418 | |
| Cambridge Water Department Middlesex County |
118,214 | |
| Quincy Water Dept. (mwra) Norfolk County |
106,000 | |
| Brockton Water Department Plymouth County |
105,788 | |
| Inima USA / Aquaria LLC Bristol County |
105,643 |
About the Massachusetts data
Retrieved from EPA ECHO on Oct 11, 2026.