(A)   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 secretary that such wastes can harm either the sewers, sewage treatment process, or equipment, or can otherwise endanger life, limb, public property, or constitute a nuisance. In forming an opinion as to the acceptability of these wastes, the secretary will give consideration to such factors as the 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.
   (B)   The substances prohibited are:
      (1)   Any liquid or vapor having a temperature higher than 150°F (65°C);
      (2)   Any water or waste containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0°C 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 horsepower (0.76 hp metric) or greater shall be subject to the review and approval of the secretary;
      (4)   Any waters or wastes containing strong acid, iron pickling wastes, or concentrated plating solutions whether neutralized or not;
      (5)   Any waters or wastes as discharged to the public sewer containing iron, chromium, copper, zinc, and similar objectionable or toxic substances exceeding a concentration or one part per million total chrome and one part per million additional of other heavy metals, or such other limits as may be established by the secretary in compliance with applicable state or federal regulations;
      (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 secretary as necessary, after treatment of the composite sewage, to meet the requirements of the state, federal, or other public agencies of jurisdiction;
      (7)   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the secretary 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 chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; or
         (d)   Unusual volume of flow or concentration of wastes constituting “sludge” as defined herein.
   (J)   Waters or wastes containing a total of 25 pounds or more suspended solids or BOD in any one day. Water exceeding these requirements may be admitted to the city sewerage system subject to the provisions of § 52.028 of this subchapter; and
   (K)   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 the agencies having jurisdiction over effluent quality.
(Ord. 46, passed 4-8-1975) Penalty, see § 52.999