40 CFR §440.63
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as provided in subpart L of this part and 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT):