TTHM (Total Trihalomethanes) violations in Vermont
65 active public water systems in Vermont had a TTHM (Total Trihalomethanes) violation in the past three years, 9 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Health effects: Long-term exposure is associated with increased bladder cancer risk. Some studies link high TTHM exposure to adverse reproductive outcomes. Bromodichloromethane is classified as a possible human carcinogen.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Barton Water System Barton · Orleans County |
950 | 3 | 1 | |
|
Barre Montpelier Sda Church Berlin · Washington County |
314 | 1 | 1 | |
|
East Calais Fire District 1 Calais · Washington County |
200 | 4 | 2 | |
|
Northeast Kingdom MHP Lyndon · Caledonia County |
156 | 2 | 1 | |
|
Chambers Mobile Home Village Hartford · Windsor County |
150 | 6 | 4 | |
|
Passumpsic Fire District 1 Barnet · Caledonia County |
140 | 4 | 1 | |
|
Newark School Newark · Caledonia County |
105 | 4 | 1 | |
|
Southface Warren · Washington County |
105 | 1 | 1 | |
|
Royalton Terrace Royalton · Windsor County |
60 | 4 | 2 | |
|
South Burlington City Water System South Burlington · Chittenden County |
19,500 | 2 | 1 | |
|
Colchester Water System Colchester · Chittenden County |
11,299 | 1 | 0 | |
|
Essex Town Water System Essex · Chittenden County |
9,734 | 1 | 0 | |
|
Essex Jct Water Dept Essex · Chittenden County |
9,500 | 2 | 0 | |
|
Montpelier Water System Montpelier · Washington County |
8,912 | 2 | 0 | |
|
Winooski Water Dept Winooski · Chittenden County |
8,500 | 1 | 0 | |
|
Milton Water Dept Milton · Chittenden County |
8,260 | 1 | 0 | |
|
Williston Water Dept Williston · Chittenden County |
7,259 | 1 | 0 | |
|
Shelburne Water Dept Shelburne · Chittenden County |
5,764 | 1 | 0 | |
|
Manchester Water Dept Manchester · Bennington County |
4,140 | 1 | 0 | |
|
Swanton Village Water Swanton · Franklin County |
4,000 | 1 | 0 | |
|
Smugglers Notch Water System Cambridge · Lamoille County |
2,960 | 1 | 0 | |
|
Chimney Hill Wilmington · Windham County |
2,594 | 4 | 0 | |
|
North Bennington Water Dept Bennington · Bennington County |
1,700 | 1 | 0 | |
|
Richford Water System Richford · Franklin County |
1,700 | 3 | 0 | |
|
Barre Town Water System Barre Town · Washington County |
1,638 | 1 | 0 | |
|
Royalton Fire District 1 Royalton · Windsor County |
1,500 | 3 | 0 | |
|
Village of Jericho Water System Jericho · Chittenden County |
1,410 | 2 | 1 | |
|
Brighton Water System Brighton · Essex County |
1,200 | 1 | 0 | |
|
Bennington College Bennington · Bennington County |
1,000 | 2 | 0 | |
|
Graniteville Fire District 4 Barre Town · Washington County |
700 | 3 | 1 | |
|
Winterplace Water System Ludlow · Windsor County |
700 | 3 | 0 | |
|
East Middlebury FD 1 Middlebury · Addison County |
642 | 2 | 0 | |
|
Hillcrest MHP INC Colchester · Chittenden County |
615 | 1 | 0 | |
|
Alburgh Village Water System Alburgh · Grand Isle County |
576 | 2 | 1 | |
|
Malletts Bay Water CO Colchester · Chittenden County |
533 | 1 | 0 | |
|
Montgomery Water System Montgomery · Franklin County |
530 | 3 | 0 | |
|
High Ridge Condominium Killington · Rutland County |
500 | 1 | 0 | |
|
Craftsbury Fire District 2 Craftsbury · Orleans County |
420 | 5 | 1 | |
|
Pinnacle Condominium Killington · Rutland County |
400 | 2 | 0 | |
|
Newport Center Water System Newport Town · Orleans County |
330 | 2 | 0 | |
|
Colonial Estates Water Corp Rutland Town · Rutland County |
300 | 3 | 2 | |
|
Crystal Springs Water System East Montpelier · Washington County |
300 | 2 | 0 | |
|
Burke Town School Burke · Caledonia County |
250 | 3 | 0 | |
|
Warren Elementary School Warren · Washington County |
237 | 3 | 0 | |
|
Westshire Elementary School West Fairlee · Orange County |
183 | 1 | 0 | |
|
Highgate Springs Poe Highgate · Franklin County |
150 | 2 | 0 | |
|
Ryegate Fire District 2 Ryegate · Caledonia County |
131 | 7 | 4 | |
|
Northwoods Village Apartments East Montpelier · Washington County |
130 | 4 | 1 | |
|
William E Dailey Precast LLC Shaftsbury · Bennington County |
100 | 3 | 0 | |
|
Historic Waitsfield Village Condominium* Waitsfield · Washington County |
91 | 5 | 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 Vermont 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.