(A) No person shall discharge or cause to be discharged the following described substances, materials, waters or wastes if it appears likely, in the judgment of the city or its agent, that such wastes can harm either the sewers, sewage treatment process or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb or public property or constitute a nuisance. The city or its agent, in forming a judgment as to the acceptability of these wastes, will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewage treatment plant and other pertinent factors.
(B) The substances prohibited are:
(1) Any liquid or vapor having a temperature higher than 150°F (65°C);
(2) Any water or waste containing fats, wax, grease or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32° and 150°F (0° and 65°C);
(3) Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor with three-fourths’ horsepower or greater shall be subject to the review and approval of the city;
(4) Any waters or wastes containing strong acid iron pickling wastes, or concentrated plating solutions whether neutralized or not;
(5) Any water or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances, or wastes exerting an excessive chlorine requirement to such degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by city for such materials;
(6) Any waters or wastes containing phenols or other taste- or odor-producing substances in such concentrations exceeding limits which may be established by the city as necessary, after treatment of the composite sewage, to meet the requirements of state, federal or other public agencies of jurisdiction for such discharge to the receiving waters;
(7) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the city in compliance with applicable state or federal regulations;
(8) Materials which exert or cause:
(a) Unusual concentrations of inert suspended solids such as, but not limited to, Fuller’s earth, lime slurries and lime residues; or of dissolved solids such as, but not limited to, sodium chloride or sodium sulfate;
(b) Excessive discoloration such as, but not limited to, dye wastes and vegetable tanning solutions;
(c) Unusual BOD, chemical oxygen demand or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; and
(d) Unusual volume of flow or concentration of wastes constituting slugs as defined herein.
(9) Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters;
(10) Sand, mud, metal, rags, paper, whole blood, paunch manure, hair or fleshings, entrails or other solid capable of causing damage or hazard to structures, equipment and personnel of the sewer system or injure the sewage treatment process;
(11) Toxic or poisonous substances in sufficient quantity to interfere with or injure the sewage treatment process, constitute a hazard to humans, animals or fish or create any hazard in the receiving area of the sewage treatment plant;
(12) Suspended solids of such character and quantity that unusual attention or expense is required to handle such materials;
(13) Waters or wastes having a pH lower than 5.5 or higher than 9.0 or having other corrosive properties capable of causing damage to the structures, equipment and personnel of the City Sewer Department;
(14) Any noxious or malodorous gas or substance capable of creating a public nuisance;
(15) Any gasoline, benzene, naphtha, fuel oil or explosive liquid, solid or gas;
(16) Any waters or wastes having a five-day biochemical oxygen demand (BOD) greater than 300 parts per million by weight; containing more than 350 parts per million by weight of suspended solids; or having an average daily flow greater than 2% of the average sewage flow of the city shall be subject to review. Where necessary in the opinion of the city or its agent, the owner shall provide, at his or her expense, such preliminary treatment as may be necessary to: reduce the BOD to 300 parts per million by weight; reduce the suspended solids to 350 parts per million by weight; or control the quantities and rates of discharge of such waters or wastes. Plans, specifications and other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the city, and no construction of such facilities shall be commenced until said approval is obtained in writing; and
(17) Any interior and exterior foundation drains and cooling water.
(Prior Code, § 6-336) Penalty, see § 53.999