U.S. Code of Federal Regulations
Regulations most recently checked for updates: Sep 24, 2023
View all text of Subpart B [§ 451.20 - § 451.24]
§ 451.23 - Effluent limitations attainable by the application of the best conventional technology (BCT).
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the application of BCT: The limitations are the same as the limitations specified in § 451.21.