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Regulations last checked for updates: May 16, 2025
Title 40 - Protection of Environment last revised: Nov 16, 2025
All Titles
Title 40
Chapter I
Part 123 - PART 123—STATE PROGRAM REQUIREMENTS
Subpart A [§ 123.1 - § 123.3] - Subpart A—General
Subpart B [§ 123.21 - § 123.36] - Subpart B—State Program Submissions
Subpart C [§ 123.41 - § 123.46] -
Subpart D [§ 123.61 - § 123.64] - Subpart D—Program Approval, Revision, and Withdrawal
authority:
Clean Water Act,
33 U.S.C. 1251
source:
48 FR 14178, Apr. 1, 1983, unless otherwise noted.
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