CFR›Title 40›Chapter I›Part 146›Subpart C ContainsSections 146.21–146.24CorpusDaily eCFRDisplayed edition2026-06-30Last updated2026-06-30 Subpart C—Criteria and Standards Applicable to Class II Wells Sections 146.21 § 146.21 Applicability. 146.22 § 146.22 Construction requirements. 146.23 § 146.23 Operating, monitoring, and reporting requirements. 146.24 § 146.24 Information to be considered by the Director. Previous B Subpart B—Criteria and Standards Applicable to Class I Wells Next D Subpart D—Criteria and Standards Applicable to Class III Wells