CFR›Title 40›Chapter I›Part 120 ContainsSections 120.1–120.2CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 120—DEFINITION OF WATERS OF THE UNITED STATES Sections 120.1 § 120.1 Purpose and scope. 120.2 § 120.2 Definitions. Authority33 U.S.C. 1251 et seq.Source85 FR 22340, Apr. 21, 2020, unless otherwise noted. Previous 118 Part 118—Clean Water Act Hazardous Substances Facility Response Plans Next 121 Part 121—State Certification of Activities Requiring a Federal License or Permit