CFR›Title 40›Chapter I›Part 121 ContainsSubparts A–ECorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 PART 121—STATE CERTIFICATION OF ACTIVITIES REQUIRING A FEDERAL LICENSE OR PERMIT Subparts A Subpart A—General Sections 121.1–121.11 B Subpart B—Neighboring Jurisdictions Sections 121.12–121.15 C Subpart C—Certification by the Administrator Sections 121.16–121.17 D Subpart D—Review and Advice Section 121.18 E Subpart E—Severability Section 121.19 Authority33 U.S.C. 1251 et seq.Source88 FR 66661, Sept. 27, 2023, unless otherwise noted. Previous 120 Part 120—Definition of Waters of the United States Next 122 Part 122—EPA Administered Permit Programs: the National Pollutant Discharge Elimination System