Skip to main content
U.S. flag

An official website of the United States government

What are PFAS?

Perfluoroalkyl and Polyfluoroalkyl Substances, or PFAS, are a group of synthetic chemicals used in a wide variety of common applications, from the linings of fast-food boxes and non-stick cookware to fire-fighting foams and other purposes. Their persistence in the environment and occurrence across the country make them a unique water quality concern. Drinking water quality and potential exposures to per-and poly-fluoroalkyl substances at the point of use (tapwater) are a rising concern in the United States. 

Learn More: