The U.S. Army Corps of Engineers and the U.S. Environmental Protection Agency published on April 21, 2014 for public comment a proposed rule defining the scope of waters protected under the Clean Water Act (CWA) in light of the U.S. Supreme Court cases in U.S. v. Riverside Bayview, Solid Waste Agency of Northern Cook County v. U.S. Army Corps of Engineers (SWANCC), and Rapanos v. United States (Rapanos).