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On June 1, the Environmental Protection Agency (EPA) released a final rule clarifying substantive authorities and procedural requirements for water quality certifications under section 401 of the Clean Water Act (CWA). EPA’s August 2019 notice of proposed rulemaking (NOPR) (summarized in our previous post) articulated the Agency’s first-ever statutory interpretation of section 401 since its enactment nearly 50 years ago, and proposed sweeping substantive and procedural changes to its section 401 regulations in conformance with its interpretation. EPA’s final rule largely adopts the regulations in its NOPR, but makes important changes in adopting new regulations that preserve authority of states and Native American tribes exercising “Treatment as a State” (TAS) authorization to ensure that discharges from federally licensed and permitted activities meet state and tribal water quality requirements.