Under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (“CERCLA” or “Superfund”), the Environmental Protection Agency (EPA or the Agency) is moving to finalize the designation of perfluorooctanoic acid (PFOA) and perfluoro octane sulfonic acid (PFOS), including their salts and structural isomers, as hazardous substances. CERCLA authorizes the Administrator to promulgate regulations designating as hazardous substances such elements, compounds, mixtures, solutions, and substances which, when released into the environment, may present substantial danger to the public health or welfare or the environment. Such a designation would ultimately facilitate cleanup of contaminated sites and reduce human exposure to these “forever” chemicals.