It shall be unlawful for any person knowingly to discharge into the city sewer system any of the following substances, under any circumstances.
(A) Cooling water or condensate from air-conditioning or refrigeration equipment.
(B) Overflow or drain water from a swimming pool or water storage tank.
(C) Discharge from roof drains or any other storm drainage system.
(D) Gasoline, benzene, naptha, fuel oil, or other flammable or explosive liquid, gas or solid.
(E) Petroleum products used in vehicles, industrial processes, or paving of surfaces.
(F) Mineral or vegetable distillates, synthetic compounds, vehicles, or pigments from the manufacture or use of paints.
(G) Any improperly shredded wastes from the preparation, cooking or dispensing of food. Such wastes are properly shredded only if all particles can be freely transported under flow conditions normally prevailing in public sewers, with no particle having any one dimension greater than one-half inch.
(H) Any wastes containing at any one time more than 100 ppm of any grease, oil, or oily substance; or a daily average concentration of said substances at over 25 ppm.
(I) Any waters or wastes containing any toxic or poisonous or corrosive substance in sufficient quantities as either to constitute a hazard to humans or animals, either during transportation or treatment of the sewage or in the receiving waters of the sewage treatment plant discharge, or to interfere with proper operation and maintenance of the sewage transportation and treatment facilities. This prohibition includes, but is not limited to, prohibiting any of the following substances in concentrations greater than the maximums shown:
Substances | Maximum Concentration (ppm) |
Cyanides | 0.01 |
Copper, total | 0.5 |
Chromium, hexavalent | 0.5 |
Chromium, total | 1.0 |
Cadmium | 0.5 |
Zinc, total | 1.0 |
Phenols | 0.005 |
(J) Wastes generated from the cleaning or emptying of any grease trap, pretreatment process, or septic tank.
(Ord. 641, passed 12-15-82; Am. Ord. 1978, passed 11-17-21)