'Blended waters,' prioritization, standards language added EPA Floats Drastic Rewrites In Attempt To Save Impaired Waters Rule In an effort to shore up support for its impaired waters rule, U.S. EPA is introducing a laundry list of changes to the rule, including language creating new protocols for addressing "blended waters" polluted by both point and nonpoint sources, the reintroduction of prioritization for drinking water sources and endangered species' habitat, and a 10-year timeframe for meeting water quality standards. The agency...