PFAS are toxic ‘forever chemicals’ that linger in our air, water, soil and bodies – here’s how to keep them out of your drinking water

Exposure to PFAS during pregnancy can lead to a child's low birth weight and accelerated puberty. RUNSMART/Digital Vision via Getty Images

Close to half of America’s tap water contains PFAS, or perfluoroalkyl and polyfluoroalkyl substances. These “forever chemicals” are in thousands of products, from clothing and cosmetics to cleaning products, and are linked to cancers, liver damage, high cholesterol and asthma.

Dr. Jessica Ray, assistant professor of civil and environmental engineering at the University of Washington, explains what PFAS are, how scientists are trying to remove them from the environment, and what you can do to reduce the impact of PFAS on your own health.