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 that introduces process wastewater pollutants into a publicly owned treatment works shall comply with 40 CFR Part 403 , and achieve the following pretreatment standards: