Source: https://www.epa.gov/

Per- and polyfluoroalkyl substances (PFAS) have been manufactured and used by a broad range of industries since the 1940s, and there are estimated to be thousands of PFAS present in the global marketplace that are used in many consumer, commercial and industrial products.

Multiple activities still result in PFAS being released to wastewater treatment plants. Current and historical activities include industrial releases (e.g., aqueous film-forming foam, pulp and paper plants), commercial releases (e.g., car washes, industrial launderers), and down-the-drain releases from homes (e.g., use of consumer products like after-market water resistant sprays, ski wax, floor finishes, and laundering of stain or water-resistant textiles with PFAS coatings). Read more.