Regulations last checked for updates: Oct 08, 2025

Title 40 - Protection of Environment last revised: Sep 08, 2029
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307, 308, and 501, Clean Water Act (Federal Water Pollution Control Act Amendments of 1972, as amended by Clean Water Act of 1977) (the “Act”); 33 U.S.C. 1311,1314,c,e, 1316 (b) andc, 1317 (b) andc,1318,and; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217
source: 49 FR 49047, Dec. 17, 1984, unless otherwise noted.