(A) No person shall discharge or cause to be discharged any storm water, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial waters to any sanitary sewer.
(B) No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
(1) Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas;
(2) Any waters or wastes containing toxic or poisonous solids, liquids, or gases in sufficient quantity, either singly or by interaction with other wastes to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the sewage treatment plant, including, but not limited to, cyanides in excess of two mg/l as CN in the wastes as discharged to the public sewer;
(3) Any waters or wastes having a pH lower than five and one-half, or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works;
(4) Solid or viscous substances in quantities or of the size capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewage works such as, but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, and the like, either whole or ground by garbage grinders; and/or
(5) Any wastes not pretreated by an interceptor tank.
(C) No person shall discharge or cause to be discharged the following substances: water, or wastes, if it appears likely in the opinion of the Sanitation Manager that the 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, public property, or constitute a nuisance. In forming his or her opinion as to the acceptability of these wastes, the Sanitation Manager will give consideration to the factors as to quantities of subject wastes in relation to flows and velocities in the sewers, capacity of the sewage treatment plant, degree of treatability of wastes in the sewage treatment plant, and other pertinent factors. 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, gas, 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 (65°C);
(3) Any garbage that has not been properly shredded;
(4) Any waters or wastes containing strong acid, iron, pickling wastes, or concentrated plating solutions, whether neutralized or not;
(5) Any waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances, or wastes exerting an excessive chlorine requirement, to the degree that any such material received in the composite sewage at the sewage treatment plant exceeds the limits established by the Sanitation Manager for the materials;
(6) Any waters or wastes containing phenols or other taste- or odor-producing substances, in the concentrations exceeding limits which may be established by the Sanitation Manager as necessary, after treatment of the composite sewage, to meet the requirements of the state, federal, or other public agencies or jurisdiction for the discharge to the receiving waters;
(7) Any radioactive wastes or isotopes of the half-life or concentration as may exceed limits established by the Sanitation Manager in compliance with applicable state or federal regulations;
(8) Any waters or wastes having a pH in excess of nine and one-half;
(9) Materials which exert or cause:
(a) Unusual concentrations of inert suspended solids (such as, but not limited to, Fullers earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and 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 the quantities as to constitute a significant load on the sewage treatment works; and/or
(10) 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 the degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(D) If any waters or wastes are discharged, or are proposed to be discharged, to the public sewers, which waters contain the substances or possess the characteristics enumerated in division (C) above, and which, in the judgment of the Sanitation Manager, may have a deleterious effect upon the sewage works, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Sanitation Manager may:
(1) Reject the wastes;
(2) Require pretreatment to an acceptable condition for discharge to the public sewers at no cost to the city;
(3) Require control over the quantities and rates of discharge; and/or
(4) Require payment to cover the added cost of handling and treating the wastes not covered by wasting taxes or sewer charges.
(E) Grease, oil, and sand interceptors shall be provided when, in the opinion of the Sanitation Manager, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, or other harmful ingredients. All interceptors shall be of a type and capacity approved by the appropriate governmental agency and the city, and shall be located as to be readily and easily accessible for cleaning and inspection. Interceptors shall be provided by persons discharging into the sewer.
(F) Where preliminary treatment of flow-equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his or her expense.
(Prior Code, § 50.07) (Ord. 420, passed 10-5-1987)