Where It Comes From
Used in coatings, paints, polishes, and some firefighting foams; can transform into PFOS or related PFAS in the environment [1][2].
How You Are Exposed
Drinking water near PFAS production or firefighting sites, indoor dust from treated goods, certain foods and fish, and at work in PFAS-related jobs [1][2].
Why It Matters
PFAS persist and can build up in people; linked to immune effects (reduced vaccine response), higher cholesterol, liver and developmental effects; EPA now regulates several PFAS in drinking water [1][3][4].
Who Is at Risk
Workers making/using PFAS, firefighters, pregnant people, infants/children, and communities with contaminated water or who eat a lot of locally caught fish [1][2].
How to Lower Your Exposure
Use certified filters (reverse osmosis or activated carbon), check local water reports, follow fish advisories, limit stain-resistant treatments, and follow workplace safety practices [1][2].