Pretreatment standards for existing sources (PSES)

Pretreatment standards for existing sources (PSES). Pretreatment standards for existing sources (PSES). Except as provided in 40 CFR 403.7 and 403.13 , any existing source subject to this subcategory which introduces pollutants into a publicly owned treatment works shall comply with 40 CFR Part 403 and achieve the following pretreatment standards for existing sources (PSES). The following standards apply to the total refinery flow contribution to the POTW: