(March 19, 2020, 1:29 PM EDT) -- WASHINGTON, D.C. — Environmental advocacy groups on March 18 sued the U.S. Environmental Protection Agency and its administrator in District of Columbia federal court, contending that they are liable for violations of federal law because the EPA continues to approve the manufacture of new variants of chemicals knowns as perfluoroalkyl and polyfluoroalkyl substances (PFAS) (Environmental Defense Fund, et al. v. Andrew Wheeler, et al., No. 20-762, D. D.C.)....