TTHM (Total Trihalomethanes) violations in Rhode Island
15 active public water systems in Rhode Island had a TTHM (Total Trihalomethanes) violation in the past three years, 2 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Narragansett Water System-Point Judith Narragansett · Washington County |
8,210 | 1 | 0 | |
|
Slatersville Public Supply North Smithfield · Providence County |
3,403 | 2 | 0 | |
|
Bristol County Water Authority Barrington, Bristol, Warren · Bristol County |
49,000 | 1 | 0 | |
|
Woonsocket Water Division Woonsocket · Providence County |
45,828 | 2 | 0 | |
|
Veolia Water Wakefield Rhode Island INC South Kingstown · Washington County |
21,225 | 1 | 0 | |
|
Quonset Business Park North Kingstown · Washington County |
13,000 | 6 | 0 | |
|
Cne New London Turnpike Entry Point Coventry · Kent County |
9,999 | 2 | 1 | |
|
South Kingstown-South Shore South Kingstown · Washington County |
6,170 | 1 | 0 | |
|
Narragansett Water Dept-North End Narragansett · Washington County |
4,432 | 1 | 0 | |
|
Jamestown Water Department Jamestown · Newport County |
3,348 | 2 | 0 | |
|
Stone Bridge Fire District Tiverton · Newport County |
2,793 | 5 | 1 | |
|
Dowling Village North Smithfield · Providence County |
2,720 | 3 | 0 | |
|
Cne Hopkins Hill Road Entry Point Coventry · Kent County |
317 | 2 | 1 | |
|
Exeter Job Corps Center Exeter · Washington County |
300 | 6 | 2 | |
|
Ladd Center Water System Exeter · Washington County |
129 | 4 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) 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 Rhode Island 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.