US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 191 — ENVIRONMENTAL RADIATION PROTECTION STANDARDS FOR MANAGEMENT AND DISPOSAL OF SPENT NUCLEAR FUEL, HIGH-LEVEL AND TRANSURANIC RADIOACTIVE WASTESSubpart C — Environmental Standards for Ground-Water Protection191.2740 C.F.R. § 191.27Effective date.Last amended: 2016Year: 2026Length: 12 wordsOfficial source Cite as 40 C.F.R. § 191.27 (2026)The standards in this subpart shall be effective on January 19, 1994.Previous40 C.F.R. § 191.26