It is unlawful for any person to discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
(A) Any liquids, solids or gases which by reason of their nature or quantity are, or may be, sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the wastewater disposal system or to the operation of the system. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, hydrides, sulfides, chlorates, perchlorates, bromates, carbides and radioactive wastes;
(B) Solid or viscous substances which will cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities such as, but not limited to, oils, wax or fats in excess of 100 mg/l, garbage with particles greater than one-half inch in any dimension, animal guts or tissues, paunch manure, bones, hair or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastic, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or glass grinding or polishing wastes;
(C) Any wastewater having a pH of less than 5.0 or greater than 9.5 or having any other corrosive property capable of causing damage or hazard to structure, equipment and personnel of the wastewater disposal system;
(D) Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to inhibit or disrupt any wastewater treatment process, constitute a hazard to humans or animals, or create a toxic effect in the receiving waters of the wastewater disposal system. A toxic pollutant shall include but not be limited to any pollutant identified pursuant to 33 U.S.C. § 1317(a);
(E) Any wastewater having a temperature greater than 150°F (65.6°C), or causing, individually or in combination with other wastewater, the influent at the wastewater treatment plant to have a temperature exceeding 104°F (40°C), or having heat in amounts which will inhibit biological activity in the wastewater treatment works resulting in interference therein;
(F) Any quantities of flow, concentrations or both which constitute a slug as defined in § 53.02;
(G) Any noxious or malodorous liquids, gases or solids which either singly or by interaction with other wastes are capable of creating a public nuisance or hazard to life, or are sufficient to prevent entry into the sewers for their maintenance and repair;
(H) Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions; and
(I) Any waters or wastes containing the following substances to a degree that any material received in the composite wastewater at the wastewater treatment works in excess of the following limits for these materials.
Arsenic | 0.1 mg/l |
Cadmium | 0.08 mg/l |
Chloroform | 1.0 mg/l |
Copper | 0.7 mg/l |
Cyanide | 2.5 mg/l |
Lead | 1.0 mg/l |
Mercury | 0.05 mg/l |
Nickel | 4.1 mg/l |
Phenolic compounds which cannot be removed by city's wastewater treatment system | 0.36 mg/l |
Silver | 0.85 mg/l |
Total chromium | 7.0 mg/l |
Zinc | 4.2 mg/l |
(Prior Code, § 3.20, Subd. 3C)