Pennsylvania
Water quality data from the EPA Safe Drinking Water Information System
Water Systems
22,622
Active public water systems
Population Served
12.63M
Residents with piped water
Lead Violations
1206
Systems exceeding 15 ppb
Copper Violations
970
Lead & Copper Rule
Average Lead Level
EPA Action Level: 15 ppb
MCLG (health goal): 0 ppb
Average across 4037 systems with reported lead data.
Violations Detected
2176 water systems in Pennsylvania have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.
Schools & Daycares
1 school or daycare water system identified in this state.
Children are especially vulnerable to lead exposure. Schools are required to test for lead and remediate violations.
Water Systems: Highest Lead Levels
| System Name | City | Population | Lead Level | Status | Sample Date |
|---|---|---|---|---|---|
| WILKES BARRE | 58,179 | 40.00 ppb | Violation | 1992-12-31 | |
| ALIQUIPPA | 15,685 | 33.50 ppb | Violation | 2024-06-30 | |
| WILKES BARRE | 59,039 | 30.00 ppb | Violation | 1992-12-31 | |
| BEAVER FALLS | 23,099 | 11.00 ppb | OK | 1992-12-31 | |
PENN STATE UNIVSchool/Daycare | UNIVERSITY PARK | 37,000 | 10.80 ppb | OK | 2025-09-30 |
| CARLISLE | 26,000 | 10.70 ppb | OK | 2025-09-30 | |
| WILKINSBURG | 125,000 | 9.78 ppb | OK | 2025-09-30 | |
| AMBRIDGE | 19,500 | 9.30 ppb | OK | 2025-09-30 | |
| BLOOMSBURG | 29,382 | 8.00 ppb | OK | 2025-09-30 | |
| LANDISVILLE | 20,988 | 8.00 ppb | OK | 2025-09-30 | |
| NORTH VERSAILLES | 11,718 | 7.30 ppb | OK | 1994-12-31 | |
| LEBANON | 57,000 | 7.10 ppb | OK | 2025-09-30 | |
| LANCASTER | 120,000 | 7.00 ppb | OK | 2025-09-30 | |
| ALLENTOWN | 118,000 | 7.00 ppb | OK | 2025-09-30 | |
| PITTSBURGH | 26,915 | 6.59 ppb | OK | 2025-09-30 |
Showing top 15 of 3920 systems with lead data. Action level: 15 ppb.
Systems With Active Violations
These water systems have exceeded EPA limits and must take corrective action.
SCRANTON · Pop. 52,002
Lead: 0.00 ppb (2025-09-30)
WILLIAMSPORT · Pop. 51,000
Lead: 2.00 ppb (2025-09-30)
NEWTOWN · Pop. 38,500
Lead: 0.00 ppb (2025-09-30)
POTTSVILLE · Pop. 31,850
Lead: 1.00 ppb (2025-09-30)
MECHANICSBURG · Pop. 24,951
Lead: 2.00 ppb (2025-09-30)
AMBLER · Pop. 20,000
Lead: 2.30 ppb (2025-09-30)
ALIQUIPPA · Pop. 19,000
Lead: 1.38 ppb (2025-09-30)
TOBYHANNA · Pop. 17,860
Lead: 0.00 ppb (2025-09-30)
ALIQUIPPA · Pop. 15,685
Lead: 33.50 ppb (2024-06-30)
SOUTH HEIGHTS · Pop. 15,000
Lead: 0.00 ppb (2025-09-30)
BRYN MAWR · Pop. 12,901
Lead: 0.00 ppb (2025-06-30)
QUAKERTOWN · Pop. 12,800
Lead: 1.33 ppb (2025-09-30)
Water Source Types
Air Quality
GoodAvg AQI
43.1
PM2.5
6 µg/m³
Unhealthy Days
6
Primary Pollutant
Ozone
Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.
PFAS Contamination
Moderate DetectionPFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →
Systems Tested
368
PFAS Detected
125
Detection Rate
34.0%
Exceeding MCL (4 ppt)
28(7.6%)
Highest recorded level: 95 ppt (EPA MCL: 4 ppt). EWG: 125 systems above proposed limits (5th highest). State established MCLs in January 2024 ahead of EPA rule. Major sources: DuPont/Chemours plants, military bases. Large private well population affected (USGS)