PFAs are per- and polyfluoroalkyl substances, including PFOA, PFOS and GenX. PFAs are man-made chemicals that don’t break down, so they accumulate over time in the environment and in the human body. Studies have shown that exposure to PFAs can lead to adverse health effects. PFAs can be found in food, commercial household products, the workplace, drinking water and living organisms. A common source of PFAs is Teflon.