The Clean Water Act was designed to protect our nation’s waters (waters of the U.S.). In Phoenix, those waters of the U.S. can include dry washes, streambeds of almost any size, some constructed canals, lakes, detention basins, and wetlands.
A Clean Water Act Section 404 permit is required for activities that disturb the ground or add material in a water of the U.S. Seemingly routine activities such as adding riprap to stabilize the bank of a wash or constructing a road or trail across a wash, even temporarily, could trigger the need for a 404 permit. Other laws and federal and state agencies may also be involved in the 404 permitting process.
The Office of Environmental Programs provides compliance guidance and policy updates on federal, state, and local surface water regulations, including stormwater and Clean Water Act Section 404, to city facilities, operations, and projects.
United States Army Corps of Engineers on Arizona Section 401 Water Quality Certification
Arizona Department of Environmental Quality Section 401 Water Quality Certification
United States Army Corps of Engineers LA District on Section 404 Permitting
USACE Nationwide Permit Information
EPA Navigable Waters Protection Rule