Chlorine (MRDL) violations in Pennsylvania
429 active public water systems in Pennsylvania had a Chlorine (MRDL) violation in the past three years, 66 of them in the latest quarter of EPA's data. What Chlorine (MRDL) is and why it matters.
Systems with a Chlorine (MRDL) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
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 | |
|
Seneca & Cranberry Mall Dist Venango County |
4,500 | 1 | 0 | |
|
Southwestern Cambria Cnty Auth Cambria County |
4,400 | 7 | 0 | |
|
Jackson Twp Water Auth Cambria County |
4,236 | 5 | 0 | |
|
Fleetwood Boro Water System Berks County |
4,218 | 3 | 0 | |
|
Ashland Area Water Authority Schuylkill County |
4,200 | 4 | 0 | |
|
Aqua PA INC Treasure Lake Div Clearfield County |
4,155 | 2 | 0 | |
|
Zelienople Boro Butler County |
4,123 | 3 | 1 | |
|
Mansfield Borough Mun Auth Tioga County |
4,100 | 9 | 0 | |
|
East Donegal Lancaster County |
4,048 | 3 | 0 | |
|
Masontown Muni Water Works Fayette County |
3,841 | 4 | 0 | |
|
Petroleum Valley Rwa Butler County |
3,800 | 2 | 0 | |
|
Somerset Twp Muni Auth Oakridg Somerset County |
3,800 | 2 | 0 | |
|
Roamingwood Sewer and Water Wayne County |
3,775 | 3 | 0 | |
|
MT Holly Springs Boro Auth Cumberland County |
3,261 | 3 | 0 | |
|
Conyngham Sugarloaf Joint MA Luzerne County |
3,230 | 3 | 0 | |
|
Lykens Boro Auth Dauphin County |
3,220 | 6 | 0 | |
|
Newport Boro Water Auth Perry County |
3,200 | 2 | 0 | |
|
Coudersport Boro Authority Potter County |
3,166 | 9 | 1 | |
|
East Taylor Muni Auth Cambria County |
3,152 | 6 | 1 | |
|
Eaton Sewer & Water CO Wyoming County |
3,100 | 3 | 0 | |
|
Midland Boro Muni Auth Beaver County |
3,100 | 7 | 1 | |
|
Pine Twp Water Distr System Mercer County |
3,082 | 2 | 0 | |
|
Orwigsburg Municipal Water Wks Schuylkill County |
3,000 | 2 | 0 | |
|
Sci Dallas Luzerne County |
2,900 | 5 | 0 | |
|
Summit Hill Water Authority Carbon County |
2,890 | 3 | 0 | |
|
West Grove Borough Chester County |
2,873 | 4 | 0 | |
|
Hughesville Borough Water Auth Lycoming County |
2,800 | 7 | 0 | |
|
Ohioville Boro Muni Auth Beaver County |
2,750 | 6 | 0 | |
|
Pvsd Center Elementary School Monroe County |
2,722 | 3 | 2 | |
|
Elkland Boro Water Authority Tioga County |
2,660 | 5 | 0 | |
|
Weatherly Boro Mun Auth Carbon County |
2,612 | 5 | 0 | |
|
Meyersdale Muni Auth Somerset County |
2,566 | 5 | 0 | |
|
Duncansville Muni Water Auth Blair County |
2,350 | 5 | 1 | |
|
Mercersburg Muni Water Auth Franklin County |
2,350 | 7 | 1 | |
|
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 | |
|
Vanport Twp Muni Auth Beaver County |
2,000 | 1 | 0 | |
|
Centre Hall Boro Water Dept Centre County |
1,900 | 4 | 0 | |
|
E Armstrong Cnty Muni Auth Armstrong County |
1,875 | 6 | 0 | |
|
Wysox Twp Municipal Authority Bradford County |
1,763 | 3 | 0 | |
|
North Warren Muni Authority Warren County |
1,749 | 5 | 0 | |
|
Cbsd Central Bucks East HS Bucks County |
1,725 | 3 | 0 | |
|
Clymer Boro Muni Auth Indiana County |
1,700 | 2 | 0 | |
|
Waterford Municipal Authority Erie County |
1,700 | 4 | 1 | |
|
Saxton Muni Water Auth Bedford County |
1,675 | 7 | 1 | |
|
Elverson Water Company Chester County |
1,641 | 3 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Chlorine (MRDL), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorine (MRDL) 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.