(A) No person shall discharge or cause to be discharged directly or indirectly, any of the following described substances to any public sewer:
(1) Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas.
(2) Any water 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 wastewater treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the wastewater treatment works. A toxic pollutant shall include, but not be limited to any pollutant identified pursuant to Section 307A of the Clean Water Act.
(3) Any water or waste having a pH lower than 5.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the wastewater treatment works.
(4) Solid or viscous substances, either whole or ground, in quantities or of such size capable of causing obstruction to the flow in the sewers or other interference with the proper continuation of the wastewater facilities, but not limited to ashes, cinders, disposable diapers, glass grinding or polishing wastes, stone cuttings or polishing wastes, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails, sanitary napkins, paper dishes, cups, milk containers, and other paper products.
(5) Noxious or malodorous liquids, gases, or substances which either singly or by interaction with other wastes are sufficient to create a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for their maintenance or repairs.
(B) No person shall discharge or cause to be discharged directly or indirectly the following described substances to any public 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 process, 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. 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 ½ 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 9.5.
(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 wastewater treatment works.
(d) Unusual volume of flow or concentration of wastes constituting a slug.
(e) Waste 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 the NPDES permit or requirements of other governmental agencies having jurisdiction over discharge from the wastewater treatment plant.
(Ord. 141, passed 11-6-89) Penalty, see § 10.99