Per- and polyfluoroalkyl substances (PFAS) are a large group of chemicals that have been widely used for decades due to their ability to resist heat, oil, grease, and water. Common uses include non-stick cookware, stain-resistant carpets and fabrics, food packaging, and fire-fighting foam. These chemicals break down very slowly in the environment and can be found in water, air, soil, fish, and wildlife. They have also been identified in the blood of people across the globe. There is evidence that exposure to PFAS chemicals may have harmful health effects. Researchers and state and federal agencies continue to investigate the potential health effects, levels of PFAS in the environment, and management options. For additional information, explore the links on this page.