Columbia Specific pollutant limitations ordinance (§ 22-215.05)
Chapter 22: Public Works and Improvements · Article VI. Sewers and Sewage Disposal
(a) Categorical pretreatment standards: Any industrial user having process waste streams which are subject to any federal categorical pretreatment standards either currently in effect or promulgated or modified after the effective date of this article shall comply with the requirements of such standards. Categorical pretreatment standards as listed in 10 CSR 20-6.100(2) and (3), current as of October 31, 2022 and dated May 31, 2020, are hereby incorporated by reference and are fully enforceable under this article the same as if fully set out herein. Limitations established in such standards shall apply to the treated effluents from the processes regulated by the standard, unless otherwise specified by the standard. When the
limits in a categorical pretreatment standard are production based, the director may convert the limits to equivalent mass or concentration for purposes of calculating effluent limitations applicable to individual users. Where regulated process effluents can not be sampled prior to mixing with other wastestreams, alternative limits for the mixed effluent may be established by the director using the combined wastestream formula subject to the provisions of 40 CFR 403.6(e). All users subject to categorical pretreatment standards are also obligated under federal law to comply with the City of Columbia's discharge limitations specified in sections 22-215 and 22-215.05 of this article. When a pollutant in a user's discharge is subject to both a limit from a categorical pretreatment standard and a City of Columbia limit at the same sampling point, the most strict limit shall apply.
(b) Local limits: No user shall discharge or cause to be discharged wastewater to the POTW containing concentrations in excess of the limits listed for the substances below:
POLLUTANT DAILY MAXIMUM (mg/l)
Total Arsenic (As) 0.210
Total Cadmium (Cd) 0.74
Total Chromium (Cr) 5.875
Total Copper (Cu) 3.003
Total Lead (Pb) 0.396
Total Mercury (Hg) 0.042
Total Nickel (Ni) 1.187
Total Silver (Ag) 0.867
Total Zinc (Zn) 10.623
Total Cyanide (CN) 0.244
Total Molybdenum (Mo) 0.162
Total Selenium (Se) 0.097
Official source: City of Columbia official Code of Ordinances (online): look up Sec. 22-215.05
Text from Supplement 139 (September 3, 2026).
Last checked November 1, 2026. The city's official copy controls; this page is a reading copy, not legal advice.