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 |
|---|---|---|---|---|
|
Hinsdale Town Water District Hinsdale (t) · Cattaraugus County |
350 | 2 | 0 | |
|
Paradise Pines MHP Mayfield (t) · Fulton County |
350 | 8 | 0 | |
|
Sandusky Water Supply Freedom (t) · Cattaraugus County |
336 | 1 | 0 | |
|
Rural Ridge Water Dist. Hamptonburgh (t) · Orange County |
326 | 3 | 0 | |
|
Constableville Village Constableville (v) · Lewis County |
310 | 3 | 0 | |
|
East Bloomfield WD #2 East Bloomfield (t) · Ontario County |
302 | 2 | 0 | |
|
Appleby Elementary School Marathon (v) · Cortland County |
300 | 2 | 0 | |
|
Country Haven Mobile Home Park Hannibal (t) · Oswego County |
300 | 3 | 1 | |
|
Haleon Durham (t) · Greene County |
280 | 2 | 0 | |
|
Burke V Burke (v) · Franklin County |
273 | 1 | 0 | |
|
Hudson Valley Resort & Spa Rochester (t) · Ulster County |
265 | 5 | 1 | |
|
Kings Highway Water District Saugerties (t) · Ulster County |
251 | 1 | 0 | |
|
Crystal Pond Water Works Windham (t) · Greene County |
250 | 3 | 1 | |
|
Northway MHP Perth (t) · Fulton County |
250 | 6 | 1 | |
|
Southside Mall Oneonta (t) · Otsego County |
250 | 5 | 1 | |
|
Wales Elementary School Wales (t) · Erie County |
250 | 1 | 0 | |
|
Bridleside Apartments North Salem (t) · Westchester County |
230 | 5 | 0 | |
|
Collingwood LLC Umh NY Catlin (t) · Chemung County |
212 | 1 | 0 | |
|
Bristol WD #1 Bristol (t) · Ontario County |
203 | 2 | 0 | |
|
Chapel Field Christian High Crawford (t) · Orange County |
200 | 3 | 0 | |
|
Creekside Park Leicester (v) · Livingston County |
200 | 1 | 0 | |
|
Dcmo Boces Masonville (t) · Delaware County |
200 | 3 | 0 | |
|
Rolling Hills Community, LLC Elbridge (v) · Onondaga County |
200 | 2 | 0 | |
|
Vernon Downs Vernon (t) · Oneida County |
200 | 2 | 0 | |
|
Whistle Tree Development Corp. Hunter (v) · Greene County |
200 | 6 | 1 | |
|
Bluestone Acres MHP Kingston (t) · Ulster County |
180 | 1 | 0 | |
|
Gore MT Ski Area Johnsburg (t) · Warren County |
180 | 2 | 0 | |
|
Wheelerville Union Free Sch. Caroga (t) · Fulton County |
180 | 2 | 0 | |
|
Tuscarora Nation School County |
175 | 5 | 0 | |
|
Treadwell Water District Franklin (t) · Delaware County |
164 | 1 | 0 | |
|
Thayers Corners WD Burke (t) · Franklin County |
160 | 2 | 0 | |
|
The Ritz Manchester (t) · Ontario County |
156 | 1 | 0 | |
|
Cooks Falls Water District Colchester (t) · Delaware County |
150 | 6 | 2 | |
|
Creeklocks Mobile Home Park Ulster (t) · Ulster County |
150 | 1 | 0 | |
|
Erieville Nelson (t) · Madison County |
150 | 3 | 0 | |
|
Morleys Mobile Park Oswegatchie (t) · St. Lawrence County |
150 | 5 | 0 | |
|
Trails End Campground & Mobile Park Russia (t) · Herkimer County |
150 | 5 | 0 | |
|
Tuscany Meadows MHP Durham (t) · Greene County |
145 | 2 | 0 | |
|
Rosendale Plains Homeowners Rosendale (t) · Ulster County |
140 | 6 | 0 | |
|
Sunset Woods Saugerties (t) · Ulster County |
138 | 3 | 1 | |
|
Top of the World Queensbury (t) · Warren County |
132 | 6 | 0 | |
|
Denton Hills Water District Wawayanda (t) · Orange County |
130 | 2 | 0 | |
|
Rock Terrace Trailer Park Highlands (t) · Orange County |
130 | 1 | 0 | |
|
Butternut Landing MHP La Fayette (t) · Onondaga County |
129 | 1 | 0 | |
|
Antlers at Diamond Point Lake George (t) · Warren County |
125 | 2 | 0 | |
|
Newtown Creek Community Inc. Horseheads (v) · Chemung County |
120 | 1 | 0 | |
|
Beaconview MHP Dryden (v) · Tompkins County |
110 | 2 | 1 | |
|
Charles River Marbletown (t) · Ulster County |
110 | 1 | 0 | |
|
Country Gardens Apartments Dryden (t) · Tompkins County |
110 | 2 | 0 | |
|
Truxton Community Center Truxton (t) · Cortland County |
110 | 2 | 0 |
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.