Per- and polyfluoroalkyl substances (PFAS) are a group of 5,000 synthetic chemicals that have been used in manufacturing since the 1940s and can be found in many consumer products like cookware, food packaging, and stain repellants. PFAS manufacturing and processing facilities, airports, and military installations that use firefighting foams are some of the main sources of PFAS. PFOA and PFOS have been voluntarily phased out by industry but are still persistent in the environment. There are still many other PFAS chemicals including GenX chemicals and PFBS in use throughout United States. Many of these PFAS chemicals may bioaccumulate and are believed to lead to adverse health effects.