A.   Stormwater And Surface Waters:
      1.   No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer.
      2.   Stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the city. Industrial or commercial cooling water or unpolluted process waters may be discharged, upon approval of the city, to a storm sewer, combined sewer or natural outlet.
   B.   Prohibited Discharges: No person shall discharge or cause to be discharged any of the following described waters and 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 in the receiving waters of the sewage treatment plant including, but not limited to, cyanides in excess of two milligrams per liter (2 mg/l) or cyanide in the wastes as discharged to the public sewer.
      3.   Any waters or wastes 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 sewage works.
      4.   Solid or viscous substances in quantities or of such 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, whole blood, paunch manure, hair and fleshings, metal, glass, rags, feathers, tar, plastics, wood, underground garbage, entrails and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
   C.   Restricted Discharges: No person shall discharge or cause to be discharged the following described substances, materials, waters or wastes if it appears likely, in the opinion of the city, that such wastes can harm either the sewers, sewage treatment process or equipment, have an adverse effect on the receiving stream, or otherwise endanger life, limb or public property, or constitute a nuisance. In forming this opinion as to the acceptability of these wastes, the city will give consideration to such factors as to 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, 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 one hundred fifty degrees Fahrenheit (150°F) (65°C).
      2.   Any water or waste containing fats, gas, grease or oils, whether emulsified or not, in excess of one hundred milligrams per liter (100 mg/l) or containing substances which may solidify or become viscous at temperatures between thirty two (32) and one hundred fifty degrees Fahrenheit (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 of three-fourths (3/4) 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 waters 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 the 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 the state, federal or other public agencies of jurisdiction of 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.   Any waters or wastes having a pH in excess of 9.5.
      9.   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 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 such quantities as to constitute a significant load on the sewage treatment works.
         d.   Unusual volume of flow or concentration of wastes constituting a "slug" as defined in section 8-3-1 of this chapter.
      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 such degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
   D.   Authority Of City Regarding Discharges:
      1.   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 subsections A, B and C of this section and which, in the judgment of the city, 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 city may:
         a.   Reject the wastes;
         b.   Require pretreatment to an acceptable condition for discharge to the public sewers;
         c.   Require control over the quantities and rates of discharge; and/or
         d.   Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of section 8-3-4-6 of this chapter.
      2.   If the city permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the city and subject to the requirements of all applicable codes, ordinances and laws. (Ord. 258, 6-14-1988)