Regulations last checked for updates: Jan 18, 2025

Title 40 - Protection of Environment last revised: Dec 30, 2025
All TitlesTitle 40Chapter IPart 125Subpart D - Subpart D—Criteria and Standards for Determining Fundamentally Different Factors Under Sections 301(b)(1)(A), 301(b)(2) (A) and (E) of the Act
authority: The Clean Water Act, 33 U.S.C. 1251
source: 44 FR 32948, June 7, 1979, unless otherwise noted.
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