TTHM (Total Trihalomethanes) violations in Pennsylvania
535 active public water systems in Pennsylvania had a TTHM (Total Trihalomethanes) violation in the past three years, 39 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 |
|---|---|---|---|---|
|
Centre County MHC LLC Centre County |
100 | 10 | 0 | |
|
Commons at Chadds Ford Delaware County |
100 | 4 | 0 | |
|
Cornerstone Care Washington County |
100 | 5 | 1 | |
|
Evitts Creek Water CO Bedford County |
100 | 2 | 0 | |
|
Hillsdale Nursing and Rehab Indiana County |
100 | 7 | 0 | |
|
Officers Christian Fellowship Bedford County |
100 | 8 | 0 | |
|
Port Florence Development Wayne County |
100 | 3 | 0 | |
|
Stanton Hills Community Westmoreland County |
100 | 6 | 1 | |
|
The Country Club of Scranton Lackawanna County |
100 | 5 | 1 | |
|
Whispering Woods Beaver County |
100 | 6 | 0 | |
|
Buckingham Twp Mill CR Ridge Bucks County |
99 | 4 | 0 | |
|
Olympic Village Lycoming County |
98 | 8 | 2 | |
|
Wadels MHP Franklin County |
97 | 3 | 0 | |
|
Old Orchard Subdivision Erie County |
96 | 4 | 0 | |
|
Wells Tannery Water Sys Fulton County |
95 | 1 | 0 | |
|
Glen Lake Estates Mercer County |
94 | 6 | 0 | |
|
Crescent Lake North Comm Assoc Pike County |
93 | 4 | 0 | |
|
Fairfield Manor MHP Westmoreland County |
92 | 7 | 2 | |
|
Demorgan Acres MHP Bradford County |
90 | 6 | 1 | |
|
Harshbarger MHP Beaver County |
90 | 6 | 1 | |
|
Hitching Post Assoc Pike County |
90 | 11 | 3 | |
|
Irish Creek MHP Berks County |
90 | 6 | 0 | |
|
Mahoning Manor Estates Carbon County |
90 | 1 | 0 | |
|
Oakland Trailer Park Susquehanna County |
90 | 6 | 1 | |
|
Paradise Sch York County |
90 | 3 | 0 | |
|
Happy Hollow Pike County |
89 | 4 | 1 | |
|
Corry Two MHC Erie County |
88 | 3 | 0 | |
|
River Rock Newville Cumberland County |
88 | 3 | 0 | |
|
Pithole Water Association McKean County |
87 | 7 | 2 | |
|
Cherry Hill Mobile Home Court Wayne County |
86 | 2 | 0 | |
|
Dallas MHP Luzerne County |
86 | 5 | 3 | |
|
Hilltop Village Association Wayne County |
86 | 9 | 2 | |
|
Nevilles Mobile Home Court Wayne County |
85 | 5 | 2 | |
|
Locustwood Mobilehome Park Lancaster County |
81 | 3 | 0 | |
|
Blue Heron Village Berks County |
80 | 6 | 1 | |
|
Diakon Wilderness Center Cumberland County |
80 | 1 | 0 | |
|
Evergreen MHC LLC Luzerne County |
80 | 8 | 3 | |
|
Franklin Mobile Home Village Butler County |
80 | 9 | 1 | |
|
Ore Hill Water Assn Blair County |
80 | 2 | 1 | |
|
Pinedale Mobile Home Park Crawford County |
80 | 4 | 0 | |
|
Lynndale Pike County |
78 | 4 | 0 | |
|
Victoria Estates MHP Crawford County |
78 | 4 | 0 | |
|
Gracious Living Estates Pch Susquehanna County |
77 | 4 | 1 | |
|
Lovetts Mobile Home Park Erie County |
77 | 3 | 0 | |
|
Village of Mtn Heights MHP Wyoming County |
76 | 2 | 1 | |
|
Camp Hebron Cws Dauphin County |
75 | 3 | 0 | |
|
Centerville Muni Water Auth Bedford County |
75 | 8 | 1 | |
|
Hanover Commons Bucks County |
75 | 6 | 0 | |
|
Jackson Commerce Park W S Mercer County |
75 | 8 | 0 | |
|
Magnolia MHP Lawrence County |
75 | 4 | 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 Pennsylvania 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.