TTHM (Total Trihalomethanes) violations in New York
217 active public water systems in New York had a TTHM (Total Trihalomethanes) violation in the past three years, 1 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 |
|---|---|---|---|---|
|
South Maple Estates Deerpark (t) · Orange County |
36 | 3 | 0 | |
|
Sunshine Village Mobile Home Park North Harmony (t) · Chautauqua County |
36 | 4 | 0 | |
|
Triton Valley Estates Farmersville Farmersville (t) · Cattaraugus County |
36 | 2 | 0 | |
|
Glen Water District 2 Glen (t) · Montgomery County |
35 | 3 | 0 | |
|
O.c. Emergency Services Center Goshen (t) · Orange County |
35 | 3 | 0 | |
|
School Time Montgomery (t) · Orange County |
35 | 5 | 0 | |
|
Ida/crossroads Center Angelica (t) · Allegany County |
30 | 2 | 0 | |
|
Pine Grove Mobile Home Park Norfolk (t) · St. Lawrence County |
30 | 4 | 0 | |
|
Barnwell Building Pound Ridge (t) · Westchester County |
25 | 4 | 0 | |
|
Big Sky II Wallkill (t) · Orange County |
25 | 6 | 1 | |
|
Garden Place Estates Potsdam (t) · St. Lawrence County |
25 | 1 | 0 | |
|
Professional Square Monroe (t) · Orange County |
25 | 6 | 1 | |
|
St. Lawrence Centre Mall Massena (t) · St. Lawrence County |
25 | 2 | 0 | |
|
Sunnyside Manor Apartments Ellery (t) · Chautauqua County |
25 | 2 | 0 | |
|
Homestead Mobile Home Community Danube (t) · Herkimer County |
23 | 3 | 1 | |
|
Windy Acres Apartments Ellenburg (t) · Clinton County |
22 | 2 | 0 | |
|
Twin Oaks Housing Altona (t) · Clinton County |
19 | 2 | 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 New York 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.