Surface Water Treatment Rule (SWTR) violations in Pennsylvania
153 active public water systems in Pennsylvania had a Surface Water Treatment Rule (SWTR) violation in the past three years, 31 of them in the latest quarter of EPA's data. What Surface Water Treatment Rule (SWTR) is and why it matters.
Systems with a Surface Water Treatment Rule (SWTR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Swt Main System Lehigh County |
14,500 | 4 | 0 | |
|
Clearfield Municipal Auth Clearfield County |
14,000 | 2 | 0 | |
|
Dallastown Yoe Water Auth York County |
12,300 | 3 | 0 | |
|
South Middleton Twp Water Auth Cumberland County |
11,695 | 6 | 0 | |
|
Humboldt Industrial Park Luzerne County |
11,243 | 5 | 0 | |
|
Municipal Authority Sunbury Northumberland County |
11,043 | 6 | 1 | |
|
Suburban Lock Haven Water Auth Clinton County |
9,700 | 4 | 0 | |
|
Icmsa Crooked Creek Indiana County |
9,638 | 5 | 0 | |
|
Muni Auth of Washington Twp Fayette County |
9,100 | 5 | 0 | |
|
Merck and CO INC Montgomery County |
8,550 | 2 | 0 | |
|
City of Lock Haven Water Dept Clinton County |
8,450 | 6 | 1 | |
|
Tamaqua Area Water Authority Schuylkill County |
8,000 | 5 | 0 | |
|
Jersey Shore Area Jnt Wat Auth Lycoming County |
6,600 | 7 | 1 | |
|
Kennett Square Mun Water Works Chester County |
6,328 | 9 | 1 | |
|
East Petersburg Borough Lancaster County |
6,215 | 1 | 0 | |
|
Belle Vernon Boro Muni Auth Fayette County |
6,000 | 3 | 1 | |
|
Hilltown Twp Water&sewer Auth Bucks County |
5,770 | 5 | 0 | |
|
Birdsboro Muni Water Auth Berks County |
5,353 | 5 | 0 | |
|
Towanda Municipal Authority Bradford County |
5,000 | 4 | 0 | |
|
Danville Municipal Water Auth Montour County |
4,992 | 6 | 0 | |
|
Tarentum Boro Water Dept Allegheny County |
4,927 | 6 | 0 | |
|
North Sewickley Mun Water Auth Beaver County |
4,578 | 4 | 1 | |
|
New Wilmington Boro Water Dept Lawrence County |
4,500 | 3 | 0 | |
|
Pike Twp Municipal Authority Clearfield County |
4,500 | 5 | 0 | |
|
Southwestern Cambria Cnty Auth Cambria County |
4,400 | 7 | 0 | |
|
Brockway Boro Municipal Auth Jefferson County |
4,384 | 4 | 0 | |
|
Jackson Twp Water Auth Cambria County |
4,236 | 5 | 0 | |
|
Ashland Area Water Authority Schuylkill County |
4,200 | 4 | 0 | |
|
PA American Dilliner System Greene County |
4,200 | 7 | 0 | |
|
Zelienople Boro Butler County |
4,123 | 3 | 1 | |
|
Mansfield Borough Mun Auth Tioga County |
4,100 | 9 | 0 | |
|
Masontown Muni Water Works Fayette County |
3,841 | 4 | 0 | |
|
Somerset Twp Muni Auth Oakridg Somerset County |
3,800 | 2 | 0 | |
|
Mifflinburg Boro Water Dept Union County |
3,690 | 2 | 0 | |
|
Lykens Boro Auth Dauphin County |
3,220 | 6 | 0 | |
|
Newport Boro Water Auth Perry County |
3,200 | 2 | 0 | |
|
East Taylor Muni Auth Cambria County |
3,152 | 6 | 1 | |
|
Nanty Glo Water Auth Cambria County |
3,152 | 6 | 1 | |
|
Midland Boro Muni Auth Beaver County |
3,100 | 7 | 1 | |
|
Mansfield University Tioga County |
3,000 | 5 | 0 | |
|
Reynoldsville Water Auth Jefferson County |
2,908 | 4 | 0 | |
|
Sci Dallas Luzerne County |
2,900 | 5 | 0 | |
|
Ontelaunee Township Berks County |
2,598 | 2 | 1 | |
|
Meyersdale Muni Auth Somerset County |
2,566 | 5 | 0 | |
|
Mercersburg Muni Water Auth Franklin County |
2,350 | 7 | 1 | |
|
Topton Boro Water Supply Berks County |
2,069 | 3 | 0 | |
|
Parks Twp Muni Auth Armstrong County |
2,049 | 3 | 0 | |
|
Glen Rock Water Auth York County |
2,000 | 2 | 0 | |
|
McConnellsburg Boro Muni Auth Fulton County |
2,000 | 9 | 0 | |
|
Wysox Twp Municipal Authority Bradford County |
1,763 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Surface Water Treatment Rule (SWTR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Surface Water Treatment Rule (SWTR) 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.