CFR›Title 40›Chapter I›Part 146›Subpart D ContainsSections 146.31–146.34CorpusDaily eCFRDisplayed edition2026-06-08Last updated2026-06-08 Subpart D—Criteria and Standards Applicable to Class III Wells Sections 146.31 § 146.31 Applicability. 146.32 § 146.32 Construction requirements. 146.33 § 146.33 Operating, monitoring, and reporting requirements. 146.34 § 146.34 Information to be considered by the Director. Previous C Subpart C—Criteria and Standards Applicable to Class II Wells Next F Subpart F—Criteria and Standards Applicable to Class V Injection Wells