Per- and polyfluoroalkyl substances (PFAS) are a class of thousands of chemicals, two of which are known to be toxic to humans. These two chemicals, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), are no longer produced in the United States.
However, they have recently been a topic of public concern, especially in regard to drinking water contamination. Other PFAS chemicals are used in consumer products including semiconductors, cellphones, textiles, renewable energy, and medical devices. Visit our website to discover science-based answers to some of the most pressing PFAS questions.