Groundwater Rule (GWR) violations in Pennsylvania
968 active public water systems in Pennsylvania had a Groundwater Rule (GWR) violation in the past three years, 256 of them still unresolved. What Groundwater Rule (GWR) is and why it matters.
Systems with a Groundwater Rule (GWR) violation
Unresolved first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
PA American Royersford Chester County |
49,508 | 1 | 0 | |
|
Bradford City Water Authority McKean County |
18,500 | 6 | 1 | |
|
Tri Cnty JT Muni Auth Washington County |
10,100 | 7 | 3 | |
|
Manor Twp JT Muni Auth Armstrong County |
6,744 | 4 | 1 | |
|
Kennett Square Mun Water Works Chester County |
6,328 | 9 | 1 | |
|
Penn National Gaming Dauphin County |
6,000 | 1 | 1 | |
|
Duquesne Water Dept Allegheny County |
5,565 | 4 | 2 | |
|
Oxford Borough Chester County |
5,280 | 2 | 0 | |
|
Akron Borough Lancaster County |
4,200 | 2 | 0 | |
|
East Donegal Lancaster County |
4,048 | 3 | 0 | |
|
Knoebels Grove Park Columbia County |
4,000 | 2 | 1 | |
|
Raccoon Creek State Park Beaver County |
4,000 | 6 | 1 | |
|
Ligonier Twp Muni Auth Westmoreland County |
3,293 | 8 | 0 | |
|
Muni Auth of Boro of Matamoras Pike County |
2,900 | 9 | 2 | |
|
Hughesville Borough Water Auth Lycoming County |
2,800 | 7 | 0 | |
|
Pine Grove Boro Water System Schuylkill County |
2,711 | 1 | 0 | |
|
Albert Gallatin Muni Auth Fayette County |
2,695 | 2 | 1 | |
|
Misericordia University Luzerne County |
2,400 | 7 | 2 | |
|
Buhl Community Water Company Mercer County |
2,227 | 2 | 0 | |
|
Waterford Municipal Authority Erie County |
1,700 | 4 | 1 | |
|
Township of Springdale Allegheny County |
1,600 | 4 | 1 | |
|
Harrisburg Intl Airport Dauphin County |
1,500 | 4 | 0 | |
|
Saegertown Borough Crawford County |
1,500 | 3 | 0 | |
|
Richlandtown Water Department Bucks County |
1,450 | 1 | 0 | |
|
Westfield Borough Waterworks Tioga County |
1,300 | 4 | 1 | |
|
Lake of the Pines Monroe County |
1,200 | 4 | 0 | |
|
Sunbury Airport Campsite Northumberland County |
1,200 | 3 | 1 | |
|
Point Marion Boro Fayette County |
1,110 | 3 | 1 | |
|
Borough of Avondale Chester County |
1,108 | 3 | 0 | |
|
Sandy Lake Boro Mercer County |
1,100 | 5 | 0 | |
|
Cambria Twp Water Auth Cambria County |
1,000 | 5 | 1 | |
|
Ski Liberty Adams County |
1,000 | 4 | 0 | |
|
Wendys Restaurant Drums Luzerne County |
1,000 | 3 | 3 | |
|
Foxburg Area Water & Sewer Aut Clarion County |
925 | 3 | 1 | |
|
Blue MT Turnpike Plaza Cumberland County |
900 | 1 | 1 | |
|
Westtown School Chester County |
900 | 2 | 1 | |
|
Eldred Borough Water Auth McKean County |
850 | 2 | 0 | |
|
New Beginnings Church of God Crawford County |
850 | 4 | 2 | |
|
Penn Township Municipal Auth Snyder County |
672 | 2 | 0 | |
|
Drums Fuel Stop Luzerne County |
600 | 1 | 1 | |
|
Wise Foods INC Columbia County |
600 | 2 | 1 | |
|
Meshoppen Borough Water CO Wyoming County |
563 | 3 | 1 | |
|
Orangeville Municipal Water AU Columbia County |
508 | 3 | 1 | |
|
Clear Creek State Park Jefferson County |
500 | 3 | 0 | |
|
Keystone Job Corps Center Luzerne County |
500 | 4 | 1 | |
|
Nelly Plaza Luzerne County |
500 | 2 | 2 | |
|
Mid Lakes Development Carbon County |
490 | 5 | 3 | |
|
Ken-Man Water CO Lehigh County |
475 | 3 | 0 | |
|
Lake Arthur Estates Butler County |
460 | 6 | 1 | |
|
Genesee Twp Water Authority Potter County |
450 | 11 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Groundwater Rule (GWR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Groundwater Rule (GWR) 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. Retrieved from ECHO on Oct 11, 2026.