CFR›Title 40›Chapter I›Part 141›Subpart A ContainsSections 141.1–141.6CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart A—General Sections 141.1 § 141.1 Applicability. 141.2 § 141.2 Definitions. 141.3 § 141.3 Coverage. 141.4 § 141.4 Variances and exemptions. 141.5 § 141.5 Siting requirements. 141.6 § 141.6 Effective dates. Next B Subpart B—Maximum Contaminant Levels