Per- and polyfluoroalkyl substances (PFAS) are a large family of man-made chemical compounds found in a wide range of consumer products such as nonstick products, polishes, waxes, paints and cleaning products. Two PFAS compounds, perfluorooctane acid (PFOA) and perfluorooctanesulfonic acid (PFOS), may be present in firefighting aqueous film forming foam (AFFF) solutions.

Source:  U.S. Fire Administration