(A)   It shall be unlawful and an offense for any person to connect or cause to be connected the downspout or conduits draining storm or rain water from the roofs, premises or other places on buildings, or uncontaminated cooling water or unpolluted industrial process waters with any of the lateral or main sanitary sewers of the city, or to in any manner conduct or cause to be conducted any uncontaminated cooling or unpolluted industrial process water, storm water, surface or subsurface water or rain water whatsoever into the sanitary sewer.
   (B)   No person shall discharge or cause to be discharged any of the following described waters or 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, or injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance or create any hazard in the receiving waters of the sewage treatment plant, including but not limited to cyanides in excess of two mg/l as CN in the wastes as discharged to the public sewer;
      (3)   Any waters or wastes having pH lower than 6.0 or greater than 10.5 or having any other chemical or corrosive properties which are hazardous or capable of causing damage to structures, equipment and personnel of the sewage works; and/or
      (4)   Solids or viscous substances in quantities or of sizes, will not pass through a quarter-inch screen, capable of causing obstruction to flow in sewer or other interference with the proper operation of the of the sewage works, storm sewers or natural outlets such as, but not limited to ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, rubber, unground garbage, animal grease or oil, whole blood, paunch manure, hair, meat fleshings, entrails, bones, hooves, toe nails, bristles, horns, chicken feet or heads, yeast, spent grain, hops, whey, whole or separated milk, paper dishes, cups, milk containers and the like, either whole or ground by garbage grinders.
(`90 Code, § 18-8)  (Ord. 2520, passed - -)