(A)   No user shall discharge or cause to be discharged, directly or indirectly, any of the following described substances into the wastewater treatment system or to any public sewer:
      (1)   Any liquids, solids or gases which, by reason of their nature or quantity are, or may be sufficient either alone or by interaction with other substances to cause fire or explosion or be injurious in any other way to the wastewater treatment system or to the operation of the system. At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the system or at any point in the system, be more than 5%, nor any single reading over 10%, of the lower explosive limit (LEL) of the meter. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides;
      (2)   Solid or viscous substances which will or may cause obstruction to the flow in a sewer or other interference with the operation of the wastewater treatment facilities such as, but not limited to, grease, garbage with particles greater than two inches in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastic, gas tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, mud or glass grinding or polishing wastes;
      (3)   Any wastewater having a pH less than 5.0 or more than 10.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the wastewater treatment system;
      (4)   Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to inhibit or disrupt any wastewater treatment process, constitute a hazard to humans or animals, or create a toxic effect in the receiving waters of the wastewater treatment system. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to § 307(a) of the Act, being 33 U.S.C. § 1313(a);
      (5)   Any noxious or malodorous liquids, gases or solids which either singly or by interaction with other wastes are capable of creating a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for their maintenance and repair;
      (6)   Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions;
      (7)   Any wastewater which creates conditions at or near the wastewater treatment system which violate any statute or any rule, regulation or ordinance of any public agency or state or federal regulatory body;
      (8)   Any wastewater having a temperature greater than 150°F (65.6°C), or causing, individually or in combination with other wastewater, the influent at the wastewater treatment plant to have a temperature exceeding 104°F (40°C), or having heat in amounts which will inhibit biological activity in the POTW resulting in interference;
      (9)   Any slug load, which shall mean any pollutant, including oxygen demand pollutants (BOD and the like), released in a discharge of such volume or strength as to cause inhibition or disruption in the wastewater treatment system;
      (10)   Non-contact cooling water or unpolluted storm or ground water unless there is no prudent and feasible alternative;
      (11)   Any wastewater containing fats, wax, grease or oils, whether emulsified or not, in excess of 150 mg/l which may solidify or become viscous at temperatures between 32°F and 150°F (0°C and 65.6°C); and any wastewater containing oil and grease concentrations of mineral origin of greater than 100 mg/l whether or not emulsified which may solidify or become viscous at temperatures between 32°F and 150°F;
      (12)   Wastewater containing 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) in such quantities that they would cause disruption with the wastewater treatment system; and
      (13)   Radioactive wastes or isotopes of such a half-life or concentration that they are in non-compliance with standards issued by the appropriate authority having control over their use and which will or are likely to cause damage or hazards to the city’s wastewater treatment system or personnel operating it.
   (B)   In addition to these prohibitions, no user shall discharge to any public sewer any discharge which causes interference, as defined, with the wastewater treatment system. Pollutants in the effluent from an industrial user shall not be considered to cause interference where the industrial user is in compliance with specific prohibitions or standards developed by federal, state or local governments. Where the industrial user is in compliance with such specific prohibitions or standards, and pollutants in the effluent from the industrial user’s facility nevertheless are determined to have caused or significantly contributed to a violation of any requirement of the city’s NPDES or state disposal system permit, and are likely to cause such a violation in the future, the city may take appropriate action to develop and enforce specific effluent limits for that industrial user to ensure renewed and continued compliance with the city’s NPDES or state disposal system permit.
(1992 Code, § 277:03)  Penalty, see § 51.99