CFR›Title 40›Chapter I›Part 146›Subpart F ContainsSection 146.51CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart F—Criteria and Standards Applicable to Class V Injection Wells Sections 146.51 § 146.51 Applicability. Previous D Subpart D—Criteria and Standards Applicable to Class III Wells Next G Subpart G—Criteria and Standards Applicable to Class I Hazardous Waste Injection Wells