Regulations last checked for updates: May 02, 2024

Title 40 - Protection of Environment last revised: Jun 26, 2024
authority: Sections 405 (d) and (e) of the Clean Water Act, as amended by Pub. L. 95-217, sec. 54(d), 91 Stat. 1591 (33 U.S.C. 1345 (d) and (e)); and Pub. L. 100-4, title IV, sec. 406 (a), (b), 101 Stat., 71, 72 (33 U.S.C. 1251
source: 58 FR 9387, Feb. 19, 1993, unless otherwise noted.