How clean is clean enough for drinking water? When it comes to “per- and polyfluoroalkyl substances” aka PFAS, health-related concerns are driving a regulatory push to virtually eliminate certain varieties of these substances from drinking water. These standards, in turn, are a prime driver for wastewater standards. Consquently, the Environmental Protection Agency (EPA) is expected to finalize rules this fall that would lower the limit for two forms of PFAS to minute quantities. On Aug. 26, EPA issued a proposal to designate perfluooctanoic acid (PFOA) and perfluooctane sulfonic acid (PFOS) as hazardous substances. At press time, The EPA was expected ...