Mercury violations in Massachusetts
11 active public water systems in Massachusetts had a Mercury violation in the past three years, 2 of them in the latest quarter of EPA's data. What Mercury is and why it matters.
Systems with a Mercury violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Lees Supermarket Westport · Bristol County |
90 | 2 | 0 | |
|
Stiles and Hart Brick Company Bridgewater · Plymouth County |
45 | 2 | 0 | |
|
Wannacomet Water Company Nantucket · Nantucket County |
27,703 | 7 | 2 | |
|
Winchester Water Dept Winchester · Middlesex County |
22,970 | 2 | 0 | |
|
Scituate Water Division Scituate · Plymouth County |
19,297 | 6 | 2 | |
|
Hanover Water Dept Hanover · Plymouth County |
14,984 | 3 | 0 | |
|
Halifax Water Department Halifax · Plymouth County |
7,575 | 4 | 0 | |
|
M.v. Public Charter School Tisbury · Dukes County |
150 | 2 | 0 | |
|
Aquinnah Wampanoag County |
89 | 5 | 0 | |
|
First Congregational Church Plympton · Plymouth County |
55 | 5 | 1 | |
|
Ashby Legion/grange/church Ashby · Middlesex County |
25 | 2 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Mercury, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Mercury 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.