On 21 April 2014, the USEPA and the Corps of Engineers (Corps) published 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). The proposed rule was developed to enhance protection for the nation’s public health and aquatic resources, and increase CWA program predictability and consistency by increasing clarity as to the scope of “waters of the United States” protected under the Act. This notice is to announce that the comment period has been extended through November 14, 2014. The comment period has been extended in response to stakeholder requests and to allow comments on new supporting materials. The agencies expect to receive additional relevant materials from the Science Advisory Board prior to October 20, 2014, which will be placed on the docket as soon as they are available. We encourage interested parties to periodically check the docket for updates on these materials. The comment period which was originally scheduled to end on July 21, 2014, had been previously extended to October 20, 2014. Comments now must be received on or before November 14, 2014.