All industrial users shall comply with: the Federal General Pretreatment Regulations in 40 CFR Part 403; the applicable national categorical pretreatment standards set out in 40 CFR Subchapter N, Parts 401 through 471 upon promulgation; and all applicable federal, state, or local requirements or standards. City Code, 1976/83, art. 25, §7(m) Ord. 91-775