§ 4-6-5 PROHIBITED DISCHARGE STANDARDS.
   (A)   General Prohibitions. No person shall discharge or deposit or cause or allow to be discharged or deposited into the wastewater treatment system any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users whether or not they are subject to categorical pretreatment standards or any other national, state, or local pretreatment standards or requirements.
   (B)   Specific Prohibitions. No person shall discharge or deposit or cause or allow to be discharged or deposited into the wastewater treatment system the following pollutants, substances, or wastewater:
      (1)   Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, waste streams with closed-cup flashpoint of less than 140 degrees Fahrenheit (60 degrees Celsius) using the test methods specified in 40 C.F.R. 261.21;
      (2)   Wastewater having a pH less than 6.0 or more than 12.0 depending on discharge amount requested, or otherwise causing corrosive structural damage to the POTW or equipment;
      (3)   Solid or viscous substances in amounts which will or may cause obstruction to the flow in a sewer, or otherwise interfere with the proper operation of the wastewater treatment system. Prohibited materials include, but are not limited to, grease, uncomminuted garbage, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole food, 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, tar, asphalt residues from refining or processing of fuel or lubricating oil, and similar substances;
      (4)   Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
      (5)   Wastewater having a temperature greater than 150 degrees Fahrenheit (60 degrees Celsius), or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104 degrees Fahrenheit (40 degrees Celsius);
      (6)   Oil and grease concentrations or amounts from industrial facilities containing floatable fats, wax, grease or oils, petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through but in no case in excess of 100 mg/l;
      (7)   Any water or waste containing substances which may solidify or become viscous at temperatures between 32 and 150 degrees Fahrenheit or 0 and 65 degrees Celsius;
      (8)   Pollutants which result in the presence of toxic gases, vapors, fumes or substances in amounts exceeding standards promulgated by the Administrator of the United States Environmental Protection Agency pursuant to Section 307(a) of the Act, and chemical elements or compounds, phenols or other taste or odor-producing substances which are not susceptible to treatment or which may interfere with the biological processes or efficiency of the treatment system, or that will pass through the system in a quantity that may cause acute worker health and safety problems;
      (9)   Trucked or hauled pollutants;
      (10)   Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interaction with other wastes, are capable of creating a public nuisance, causing acute worker health and safety problems, creating hazard to life, or may be sufficient to prevent entry into the sewers for maintenance or repair;
      (11)   Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant's effluent, thereby violating the city's NPDES permit, or color limits established by the city;
      (12)   Radioactive wastes or isotopes of such half-life or concentration that they do not comply with regulations or orders issued by the appropriate authority having control over their use and which will or may cause damage or hazards to the sewerage facilities or personnel operating the system;
      (13)   Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, and unpolluted wastewater, unless specifically authorized by the Administrator;
      (14)   Sludges, screenings, or other residues from the pretreatment of industrial wastes;
      (15)   Medical wastes, except as specifically authorized by the Administrator in a wastewater discharge permit;
      (16)   Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail a toxicity test;
      (17)   Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;
      (18)   Fats, oils, or greases of animal or vegetable origin in concentrations greater than 100 mg/l;
      (19)   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 sewerage facilities 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 sewer system, be more than five percent (5%) nor any single reading over ten percent (10%) of the Lower Explosive Limit (L.E.L.) 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;
      (20)   Wastewaters at a flow rate or containing such concentrations or quantities of pollutants that exceeds for any time period longer than fifteen (15) minutes more than five (5) times the average twenty-four (24) hour concentration, quantities or flow during normal operation and that would cause a treatment process upset and subsequent loss of treatment efficiency; and
      (21)   Any waste which will cause corrosion or deterioration of the treatment system. All wastes discharged directly or indirectly through wastewater system owned by others to the city wastewater system must have a pH value in the range of (6) to (9) standard units. Prohibited materials include, but are not limited to, acids, sulfides, concentrated chloride and fluoride compounds and substances which will react with water to form acidic products.
   (C)   Pollutants, substances, or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW.
(Ord. CM-93-34, passed 12-13-1993; Ord. 21-05, passed 4-12-2021)