Interim Enhanced Surface Water Treatment Rule violations in Pennsylvania
92 active public water systems in Pennsylvania had a Interim Enhanced Surface Water Treatment Rule violation in the past three years, 17 of them in the latest quarter of EPA's data. What Interim Enhanced Surface Water Treatment Rule is and why it matters.
Systems with a Interim Enhanced Surface Water Treatment Rule violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
ST Marys Area Water Auth Elk County |
19,588 | 4 | 0 | |
|
Robinson Twp Muni Auth Allegheny County |
16,354 | 4 | 0 | |
|
Tamaqua Area Water Authority Schuylkill County |
8,000 | 5 | 0 | |
|
Union City Municipal Authority Erie County |
4,295 | 6 | 0 | |
|
Western Clinton CO Mun Auth Clinton County |
2,610 | 9 | 1 | |
|
Cambridge Springs Borough Crawford County |
2,363 | 7 | 1 | |
|
Polk Center Venango County |
1,058 | 13 | 0 | |
|
Southwest Warren CO Mun Auth Warren County |
1,040 | 4 | 1 | |
|
South Mountain Restoration Ctr Franklin County |
950 | 4 | 1 | |
|
Austin Borough Water Potter County |
700 | 5 | 2 | |
|
West Carroll W Auth Bakerton Cambria County |
670 | 7 | 0 | |
|
W Carroll Twp W Auth ST Bened Cambria County |
488 | 6 | 0 | |
|
Miles Twp Water Auth East Centre County |
425 | 4 | 1 | |
|
Pinecrest Village MHP Lycoming County |
195 | 12 | 3 | |
|
Gillett MHC Bradford County |
100 | 10 | 1 | |
|
Shawnee ST Park Bedford County |
50 | 3 | 0 | |
|
Cent Clinton CO Water Fil Auth Clinton County |
25 | 3 | 0 | |
|
Philadelphia Water Department Philadelphia County |
1,600,000 | 1 | 0 | |
|
Pittsburgh Water & Sewer Auth Allegheny County |
520,000 | 3 | 0 | |
|
Erie City Water Authority Erie County |
220,001 | 3 | 0 | |
|
West View Water Authority Allegheny County |
200,000 | 1 | 0 | |
|
Wilkinsburg-Penn JT Water Auth Allegheny County |
125,000 | 3 | 0 | |
|
Veolia Water Dauphin County |
110,000 | 1 | 0 | |
|
PA American Norristown Montgomery County |
88,885 | 1 | 0 | |
|
Greater Johnstown WA Riverside Cambria County |
49,500 | 7 | 0 | |
|
Aqua PA Shenango Valley Wtp Mercer County |
48,000 | 2 | 0 | |
|
Hanover Muni Water Works York County |
40,900 | 4 | 0 | |
|
PA American Coatesville Chester County |
36,960 | 2 | 0 | |
|
Columbia Water CO Lancaster County |
25,200 | 1 | 0 | |
|
Center Twp Water Auth Beaver County |
19,000 | 4 | 0 | |
|
Elizabethtown Area Water Lancaster County |
19,000 | 1 | 0 | |
|
Bradford City Water Authority McKean County |
18,500 | 6 | 1 | |
|
Phoenixville Water Dept Chester County |
16,599 | 8 | 0 | |
|
Red Lion Municipal Authority York County |
15,882 | 4 | 0 | |
|
Tri Cnty JT Muni Auth Washington County |
10,100 | 7 | 3 | |
|
Downingtown Water Authority Chester County |
9,900 | 3 | 0 | |
|
Aqua PA Greenville Mercer County |
8,600 | 3 | 0 | |
|
Minersville Municipal Water AU Schuylkill County |
7,275 | 5 | 0 | |
|
Blythe Twp Municipal Authority Schuylkill County |
7,100 | 2 | 0 | |
|
Jersey Shore Area Jnt Wat Auth Lycoming County |
6,600 | 7 | 1 | |
|
Schuylkill Haven Boro Water Schuylkill County |
6,000 | 2 | 0 | |
|
Buffalo Twp Mun Auth Freeport Armstrong County |
5,849 | 2 | 1 | |
|
MT Union Municipal Auth Huntingdon County |
5,801 | 5 | 1 | |
|
Danville Municipal Water Auth Montour County |
4,992 | 6 | 0 | |
|
Tarentum Boro Water Dept Allegheny County |
4,927 | 6 | 0 | |
|
Franklin System York Water Franklin County |
4,400 | 5 | 1 | |
|
PA American Dilliner System Greene County |
4,200 | 7 | 0 | |
|
Mansfield Borough Mun Auth Tioga County |
4,100 | 9 | 0 | |
|
Blairsville Muni Auth Indiana County |
4,023 | 5 | 0 | |
|
Raccoon Creek State Park Beaver County |
4,000 | 6 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Interim Enhanced Surface Water Treatment Rule, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Interim Enhanced Surface Water Treatment Rule 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.