Two environmental groups are calling on the Environmental Protection Agency to regulate and require the cleanup of per- and polyfluoroalkyl substances (PFAS) and list them as hazardous substances under the Clean Air Act, the Clean Water Act and the Comprehensive Environmental Response, Compensation, and Liability Act.

While the Environmental Protection Agency has proposed a clean up standard of 70 parts per trillion for some PFAS chemicals, the Environmental Working Group says a safe standard is 1 part per trillion.