Interactive PFAS Contamination Map

Explore PFAS forever-chemical contamination across all 50 US states. Based on EPA UCMR3 and UCMR5 drinking water testing. Click any state to see city-by-city detection rates, average and maximum levels, and affected populations.

Quick Answers

What is the EPA PFAS limit? The EPA finalized enforceable limits in 2024: 4 parts per trillion (ppt) for PFOA and PFOS individually. Public water systems must comply by 2029.

How do I check my own water? Enter your ZIP code on the KnowYourExposure homepage to see the PFAS and other contaminants your utility has reported.