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 |
|---|---|---|---|---|
|
Dcnr Quehanna Facility Clearfield County |
50 | 5 | 0 | |
|
Ray Price Motors Snydersville Monroe County |
50 | 3 | 0 | |
|
Safe Harbor Power Corp Lancaster County |
50 | 5 | 0 | |
|
Sky View Terrace Beaver County |
50 | 7 | 0 | |
|
Tri County Rural Electric Tioga County |
50 | 5 | 0 | |
|
Warren County Christian School Warren County |
50 | 3 | 1 | |
|
Dtac Lycoming County |
48 | 2 | 0 | |
|
Emery Cove Estates Wayne County |
48 | 4 | 0 | |
|
Poco Apartments (lower) Monroe County |
48 | 9 | 2 | |
|
Nittany Grove Condo Comm Assn Centre County |
45 | 4 | 0 | |
|
Shermans Valley Apts Perlo III Perry County |
45 | 5 | 0 | |
|
Sunbury Animal Hospital Northumberland County |
45 | 2 | 0 | |
|
Cornerstone Living Lehigh County |
44 | 7 | 0 | |
|
Lakeview Mobilehome Park Butler County |
44 | 6 | 0 | |
|
Mountain Crest Development Wayne County |
44 | 7 | 0 | |
|
Echo Beach MHP Bradford County |
43 | 5 | 1 | |
|
Youth Forestry Camp NO 3 Huntingdon County |
43 | 2 | 0 | |
|
Lakeside MHP Lebanon County |
40 | 4 | 0 | |
|
Liberty Park Susquehanna County |
40 | 6 | 2 | |
|
Pleasant Village MHP Tioga County |
40 | 4 | 0 | |
|
Lycoming Creek Village Lycoming County |
38 | 4 | 1 | |
|
Schoolhouse Hill Apts Wyoming County |
38 | 3 | 2 | |
|
Eagle Ridge Personal Care Home Clinton County |
37 | 10 | 1 | |
|
The Valley MHC Warren County |
37 | 6 | 0 | |
|
Poco Apartments (upper) Monroe County |
36 | 9 | 3 | |
|
Crestview Mobile Home Park Crawford County |
35 | 3 | 0 | |
|
Wheatfield Village Pike County |
35 | 10 | 2 | |
|
Woodlyn Residences Wayne County |
35 | 4 | 0 | |
|
Fox Group Office Complex Monroe County |
33 | 2 | 0 | |
|
Doe Run Mobile Home Park Chester County |
29 | 7 | 0 | |
|
Calvary Chapel Harrisburg Cumberland County |
25 | 2 | 0 | |
|
Far Away Auburn Schuylkill County |
25 | 10 | 3 | |
|
Hazle Water Depot LLC Luzerne County |
25 | 4 | 2 | |
|
Tower Springs LLC Schuylkill County |
25 | 9 | 1 | |
|
Hellers Mobile Home Park Columbia County |
21 | 9 | 2 |
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.