(A) No person shall discharge or cause to be discharged directly or indirectly the following described substances to any pubic sewer unless, in the opinion of the city, such discharge will not harm the wastewater facilities, nor cause obstruction to the flow in sewers, nor otherwise endanger life, limb, or public property, nor constitute a nuisance. In forming its opinion as to the acceptability of the wastes, the city may give consideration to such factors as the quantities of the subject wastes in relation to flows and velocities in the sewers, materials, or construction of the sewers, nature of the wastewater treatment proves, capacity of the wastewater treatment plant, the city’s NPDES permit, and other pertinent factors. The city may make such determinations either on a general basis or as to discharges from individual users or specific discharges, and may prohibit certain discharges from individual users because of unusual concentrations or combinations which may occur.
(B) The substances prohibited are:
(1) Any liquid or vapor having a temperature in excess of 150°F (65°C);
(2) Any water or waste containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 milligrams per liter 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 ground or comminuted to such degree that all particles will be carried freely in suspension under flows normally prevailing in the public sewers, with no particles greater than one half-inch in any dimension;
(4) Any water or wastes containing strong acid, iron pickling wastes, or concentrated plating solutions, whether neutralized or not;
(5) Any water or wastes containing phenols or other taste or odor producing substances which constitute a nuisance or hazard to the structures, equipment, or personnel of the wastewater works, or which interfere with the treatment required to meet the requirements of the state or federal government, or any other public agency with proper authority to regulate the discharge from the wastewater treatment plant;
(6) Any radioactive wastes or isotopes of such half-life or concentration that they are not in compliance with regulations issued by the appropriate authority having control over their use or may cause damage or hazards to the treatment works or personnel operating it;
(7) Any water or wastes having a pH in excess of nine and one-half; and
(8) Materials which exert or cause:
(a) Unusual concentrations of 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 wastewaster treatment works;
(d) Unusual volume of low or concentrations of wastes constituting a slug; and
(e) Water or water-containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet the requirements of NPDES permit, or requirements of other governmental agencies having jurisdiction over discharge from the wastewater treatment plant.
(Prior Code, § 52.12) Penalty, see § 52.99