Tap Water Results

Pennsylvania tap water quality

1,849 community water systems serving 11.5 million people.

Data: U.S. EPA · How we read the data · How we check it

85
systems with PFAS above a federal limit
4.2 million
people served by them
360
systems EPA tested for PFAS
76
systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years. 1,253 more systems have no recent lead results in EPA's database.

Water systems with PFAS above the federal limit

Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.

And 20 more in the full list of Pennsylvania utilities below.

Pennsylvania PFAS report: chart, rankings and data to download →

Pennsylvania's own PFAS limits

Pennsylvania enforces its own drinking water limits for PFAS (effective: 2023-01-14): PFOA 14 ppt, PFOS 18 ppt. The federal limits are 4 ppt for PFOA and PFOS.

25 Pa. Code 109.202. MCLGs 8 (PFOA) and 14 (PFOS) ng/L. Compliance monitoring began 2024 (larger systems) / 2025 (<=350 people).

Source: 25 Pa. Code § 109.202 State MCLs, MRDLs and treatment technique requirements, checked 2026-11-14. Utility pages compare each system's EPA results with these limits. State compliance is judged on the state's own sampling.

Largest water systems in Pennsylvania

Pennsylvania cities and towns

Most health-based violations since 2016

All Pennsylvania utilities on this site

Every Pennsylvania system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 1,849 systems as CSV.

Questions

Does Pennsylvania tap water have PFAS?

EPA tested 360 community water systems in Pennsylvania for 29 PFAS between 2023 and 2025. 115 had at least one regulated PFAS detected, and 85 had an entry-point average above a 2024 federal limit. Those 85 systems serve about 4.2 million people (37% of people on community water in Pennsylvania). Systems have until 2029 to meet the limits.

How many Pennsylvania water systems have violations?

783 systems in Pennsylvania had at least one health-based violation since 2016 (2,682 violations in total). 3,742 violations are currently listed as unaddressed.

Which Pennsylvania water systems are over the lead action level?

76 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Another 1,253 systems have no lead results in EPA's database from the last five years, including 337 whose last result was above the action level. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.