CWA Section 404(g) authorizes States and Tribes to assume administration of the dredged and fill permitting program for certain waters, and addresses the requirements for implementation and the U.S. Environmental Protection Agency (EPA) oversight. States and tribes requested that the EPA clarify those waters over which a State or Tribe may assume CWA section 404 permit responsibilities, and those waters over which the U.S. Army Corps of Engineers (Corps) retains CWA 404 permit responsibility, under an approved State or Tribal program. In 2015, the EPA convened a Federal Advisory Committee (FACA), comprised of State, Tribal, and other stakeholder representatives charged with providing recommendations for how the EPA could provide clarity on this issue. This rule is intended to provide clarity on the issue of which waters are assumable following the EPA's consideration of the FACA recommendations and to provide needed technical corrections and updates to the 1988 regulations.