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 in the latest quarter of EPA's data. What Groundwater Rule (GWR) is and why it matters.
Systems with a Groundwater Rule (GWR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Primo Water Vending Northampton County |
25 | 2 | 2 | |
|
State Line Dollar General Franklin County |
25 | 2 | 0 | |
|
Subway Restaurant 40040 Lycoming County |
25 | 3 | 1 | |
|
The Wagon Wheel Lycoming County |
25 | 4 | 3 | |
|
Uni Mart 4161 Carsons Corner Centre County |
25 | 3 | 1 | |
|
Village Tavern Erie County |
25 | 1 | 0 | |
|
Aqua PA Main System Montgomery County |
822,600 | 6 | 0 | |
|
Lca Allentown Division Lehigh County |
118,000 | 3 | 0 | |
|
North Wales Water Authority Montgomery County |
72,496 | 2 | 0 | |
|
State College Boro Water Auth Centre County |
72,000 | 5 | 0 | |
|
Penn State Univ Centre County |
37,000 | 2 | 0 | |
|
Northampton Bucks CO Mun Auth Bucks County |
36,750 | 4 | 0 | |
|
Warminster Municipal Authority Bucks County |
36,000 | 2 | 0 | |
|
Guilford Water Auth Franklin County |
28,135 | 3 | 1 | |
|
Horsham Water&sewer Authority Montgomery County |
26,000 | 5 | 0 | |
|
Muhlenberg Twp Muni Auth Berks County |
22,400 | 4 | 0 | |
|
Nwwa Warrington Township Bucks County |
21,588 | 3 | 0 | |
|
Dover Twp Water Sys York County |
21,097 | 1 | 0 | |
|
Ambler Boro Water Dept Montgomery County |
20,000 | 2 | 0 | |
|
Meadville Area Water Authority Crawford County |
17,339 | 1 | 0 | |
|
Upper Southampton Mun Auth Bucks County |
16,000 | 3 | 0 | |
|
Slippery Rock Muni Auth Butler County |
15,778 | 3 | 0 | |
|
Aqua PA Susquehanna Division Bradford County |
15,569 | 2 | 1 | |
|
Boro of Waynesboro Franklin County |
13,200 | 4 | 0 | |
|
Quakertown Boro Bucks County |
12,800 | 3 | 0 | |
|
Gettysburg Muni Auth Adams County |
12,425 | 1 | 0 | |
|
West Manchester Twp Auth York County |
9,960 | 3 | 0 | |
|
Veolia Middletown Dauphin County |
9,600 | 2 | 0 | |
|
Bellefonte Borough Water Auth Centre County |
9,500 | 3 | 0 | |
|
Windber Area Auth Somerset County |
9,463 | 6 | 0 | |
|
General Authority of Franklin Venango County |
9,096 | 2 | 0 | |
|
Dillsburg Area Authority York County |
8,962 | 1 | 0 | |
|
Hemlock Farms (main) Pike County |
8,321 | 8 | 0 | |
|
PA American Audubon Montgomery County |
8,200 | 8 | 0 | |
|
Maidencreek Twp Water Auth Berks County |
7,505 | 1 | 0 | |
|
Littlestown Boro Adams County |
7,300 | 2 | 0 | |
|
Upper Saucon Twp Water Supply Lehigh County |
7,300 | 1 | 0 | |
|
Womelsdorf Robesonia JT Auth Berks County |
7,070 | 1 | 0 | |
|
MT Airy Casino & Resort Monroe County |
7,000 | 5 | 2 | |
|
Palmerton Municipal Authority Carbon County |
7,000 | 3 | 0 | |
|
Richland Twp Water Authority Bucks County |
6,800 | 3 | 0 | |
|
Sewickley Boro Water Auth Allegheny County |
6,800 | 5 | 1 | |
|
Catasauqua Mun Water Works Lehigh County |
6,598 | 2 | 0 | |
|
Aqua PA Fawn Lake Forest Pike County |
6,533 | 2 | 0 | |
|
Washington Twp Muni Auth Franklin County |
6,134 | 1 | 0 | |
|
College Twp Water Authority Centre County |
6,000 | 2 | 0 | |
|
Albion Borough Erie County |
5,842 | 7 | 0 | |
|
MT Union Municipal Auth Huntingdon County |
5,801 | 5 | 1 | |
|
Hellertown Borough Authority Northampton County |
5,800 | 1 | 0 | |
|
Beaver Boro Muni Auth Beaver County |
5,799 | 9 | 0 |
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.