CFR›Title 40›Chapter I›Part 191›Subpart C ContainsSections 191.21–191.27CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart C—Environmental Standards for Ground-Water Protection Sections 191.21 § 191.21 Applicability. 191.22 § 191.22 Definitions. 191.23 § 191.23 General provisions. 191.24 § 191.24 Disposal standards. 191.25 § 191.25 Compliance with other Federal regulations. 191.26 § 191.26 Alternative provisions. 191.27 § 191.27 Effective date. Source58 FR 66415, Dec. 20, 1993, unless otherwise noted. Previous B Subpart B—Environmental Standards for Disposal