U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 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]
§ 51.851 - State implementation plan (SIP) or Tribal implementation plan (TIP) revision.
§§ 51.852-51.860 - §[Reserved]
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