Pretreatment standards for existing sources (PSES).

Except as provided in 40 CFR 403.7 and 493.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources (PSES): Subpart BC—Sodium Fluoride Pollution or pollutant property PSES effluent limitations Maximum for any 1 day Average of daily values for 30 consecutive days Milligrams per liter (mg/l) Fluoride 50 25