CFR›Title 40›Chapter I›Part 123 ContainsSubparts A–DCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 123—STATE PROGRAM REQUIREMENTS Subparts A Subpart A—General Sections 123.1–123.3 B Subpart B—State Program Submissions Sections 123.21–123.36 C Subpart C—Transfer of Information and Permit Review Sections 123.41–123.46 D Subpart D—Program Approval, Revision, and Withdrawal Sections 123.61–123.64 AuthorityClean Water Act, 33 U.S.C. 1251 et seq.Source48 FR 14178, Apr. 1, 1983, unless otherwise noted. Previous 122 Part 122—EPA Administered Permit Programs: the National Pollutant Discharge Elimination System Next 124 Part 124—Procedures for Decisionmaking