CFR›Title 27›Chapter I›Part 31›Subpart A ContainsSections 31.1–31.4CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart A—General Provisions Sections 31.1 § 31.1 Definitions. 31.2 § 31.2 Territorial extent. 31.3 § 31.3 Basic permit requirements. 31.4 § 31.4 Relation to State and municipal law. Previous 31.0 § 31.0 Scope. Next B Subpart B—Administrative Provisions