EPA enforceable limits (2024)
In April 2024, the U.S. EPA finalized the first-ever national drinking water standards for PFAS. The Maximum Contaminant Levels (MCLs) are 4 parts per trillion for PFOA and PFOS individually. PA water systems must achieve compliance by 2029. Many PA systems already exceed these limits.
Heavily impacted PA water systems
- • Warminster Municipal Authority — multiple wells closed or treated.
- • Warrington Township Water & Sewer — documented contamination from former NAWC Warminster.
- • Horsham Water & Sewer Authority — wells shut down; bottled water distributed.
- • Hatboro Borough Water Department — PFAS detections in distribution.
- • Aqua Pennsylvania & Pennsylvania American Water — multi-county PFAS detections, especially in Bucks, Montgomery, Chester, and Delaware counties.
- • Philadelphia Water Department — detections in Schuylkill and Delaware River source water.
- • Capital Region Water (Harrisburg) & Dauphin County systems — tied to Harrisburg International Airport AFFF use.
- • Chambersburg-area systems — tied to Letterkenny Army Depot.
- • Private wells across Bucks, Montgomery, Chester, Franklin, Lancaster, and Berks counties.
If you used contaminated water
If you drank from a Pennsylvania public water system or a private well that has been sampled and confirmed positive for PFAS — especially over a period of years — and you have since been diagnosed with kidney cancer, testicular cancer, thyroid disease, ulcerative colitis, or another linked condition, your case may qualify for review.