CFR›Title 40›Chapter I›Part 450›Subpart A ContainsSections 450.10–450.11CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart A—General Provisions Sections 450.10 § 450.10 Applicability. 450.11 § 450.11 General definitions. Next B Subpart B—Construction and Development Effluent Guidelines