Regulations last checked for updates: Jan 18, 2025

Title 40 - Protection of Environment last revised: Dec 30, 2025
authority: Sections 301, 304, 306, 307, 308, 402, and 501 of the Clean Water Act, as amended, (33 U.S.C. 1311,1314,1316,1317,1318,1342,and,and,as.S.C. 7412)
source: 63 FR 18635, Apr. 15, 1998, unless otherwise noted.