EPA Webinar on Treatment of PFOS and PFAS for Small Drinking Water Systems: This Tuesday, September 27, 2016, U.S. EPA will be hosting a small drinking water systems webinar to discuss water treatment methods for removing perfluorinated chemicals from drinking water. The webinar will begin with an overview of the challenges associated with developing an analytical method for 14 PFAAs. This will be followed by a presentation on PFAS, including sources and occurrence data.  EPA will present on PFOS treatment applicability and costs, as well as additional treatment data needs (Register).