Enterococci in drinking water
7 active public water systems in 2 states had a Enterococci violation in the past three years, and 6 have one that is still unresolved.
You are on Tapcensus, an independent guide to the EPA compliance records of every public water system in the United States. This page explains Enterococci and lists the water systems whose records include a related violation. It does not show measured levels.
Is Enterococci in the records for your water system?
Enter a ZIP code, town, or street address to see the water systems that serve your area, their status, and which rules and contaminants appear in their violations.
Enter a ZIP code, town, or street address.
The standard and what a violation means
Water systems with a Enterococci violation, by state
Active public water systems that reported at least one related violation to EPA in the past three years. Each state links to the list of its affected systems.
| State | Systems with violations, 3 yr | Share of active systems | Unresolved |
|---|---|---|---|
| Massachusetts | 6 | 0% | 6 |
| California | 1 | 0% | 0 |
Largest water systems with a Enterococci violation
The ten biggest systems, by people served, whose records include a related violation in the past three years.
| 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 | |
|
Robinson's Corner MHP Butte County |
20 | 8 | 2 |
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 systems table are for the whole system, not Enterococci alone. Counts cover active systems in all 50 states and the District of Columbia.
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 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.