The U.S. Army Corps of Engineers, Denver Regulatory Office, through the Regulatory Program, administers and enforces Section 404 of the Clean Water Act (CWA) in the Omaha District portion of Colorado. Under CWA Section 404, a permit is required for the discharge of dredged or fill material into waters of the United States. Many waterbodies and wetlands in the nation are waters of the United States and are subject to the Corps' regulatory authority.