40 CFR 430.14: Effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT).

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart where chlorophenolic-containing biocides are used must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT). Non-continuous dischargers shall not be subject to the maximum day mass limitations in kg/kkg (lb/1000 lb) but shall be subject to concentration limitations. Concentration limitations are only applicable to non-continuous dischargers. Permittees not using chlorophenolic-containing biocides must certify to the permit-issuing authority that they are not using these biocides:

Subpart A

[BAT effluent limitations]

Pollutant or pollutant property Maximum for any 1 day

Kg/kkg (or pounds per 1,000 lb) of product Milligrams/liter

Pentachlorophenol 0.0025 (0.011)(55.1)/y

Trichlorophenol 0.016 (0.068)(55.1)/y

y = wastewater discharged in kgal per ton of product.