Regulations last checked for updates: Jul 27, 2025

Title 40 - Protection of Environment last revised: Nov 27, 2025
All TitlesTitle 40Chapter IPart 51Subpart W - Subpart W—Determining Conformity of General Federal Actions to State or Federal Implementation Plans
  • § 51.850 - [Reserved]
  • §§ 51.852-51.860 - §[Reserved]
authority: 23 U.S.C. 101; 42 U.S.C. 7401-7671q.
source: 36 FR 22398, Nov. 25, 1971, unless otherwise noted.
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