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This action responds to longstanding requests from Tribes and states to clarify the requirements and processes to assume and administer a Clean Water Act section 404 dredge and fill permitting program. The Agency proposed revisions to the existing section 404(g) regulations on August 14, 2023. The final rule responds to input received from Tribes, states, and stakeholder groups as well as feedback received during the public comment period. It facilitates Tribal and state assumption of the Clean Water Act section 404 permitting program by making the procedures and substantive requirements for assumption more transparent and straightforward; clarifying the minimum requirements for section 404 program assumption while allowing for flexibility in how these requirements are met; and making technical revisions, including removing outdated references associated with the section 404(g) regulations. The final rule was published on December 18, 2024, and became effective on January 17, 2025.