US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 146 — UNDERGROUND INJECTION CONTROL PROGRAM: CRITERIA AND STANDARDSSubpart D — Criteria and Standards Applicable to Class III Wells146.3140 C.F.R. § 146.31Applicability.Last amended: 2016Year: 2026Length: 16 wordsOfficial source Cite as 40 C.F.R. § 146.31 (2026)This subpart establishes criteria and standards for underground injection control programs to regulate Class III wells.Next40 C.F.R. § 146.32