40 CFR § 450.23
Effluent limitations reflecting the best conventional pollutant control technology (BCT)
June 9, 2020
Except as provided in 40 CFR 125.30 through 125.32, any point source subject to this subpart must achieve, at a minimum, the following effluent limitations representing the degree of effluent reduction attainable by application of the best conventional pollutant control technology (BCT). The effluent limitations are described at §450.21.