Enterococci violations in Massachusetts
6 active public water systems in Massachusetts had a Enterococci violation in the past three years, 6 of them in the latest quarter of EPA's data. What Enterococci is and why it matters.
Systems with a Enterococci violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Yarmouth Water Department Yarmouth · Barnstable County |
38,900 | 1 | 1 | |
|
Sudbury Water District Sudbury · Middlesex County |
18,416 | 3 | 3 | |
|
Rowley Water Department Rowley · Essex County |
6,161 | 1 | 1 | |
|
Tisbury Water Works Tisbury · Dukes County |
6,082 | 2 | 2 | |
|
Topsfield Water Department Topsfield · Essex County |
5,435 | 2 | 2 | |
|
Hadley Dpw Water Division Hadley · Hampshire County |
4,819 | 1 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Enterococci, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Enterococci alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Massachusetts records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.