The August 31, 2018 Federal Register Notice indicates EPA is requesting input on “possible approaches to updating the National Pollutant Discharge Elimination System (NPDES) regulations related to the management of peak wet weather flows at Publicly Owned Treatment Works (POTWs) treatment plants serving separate sanitary sewer collection systems.” While states have historically expressed a diversity of opinions on this issue, more than half the states have indicated they could support EPA exploring a blending rule, depending on how blending was defined.