A. No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water or unpolluted industrial process waters to any sanitary sewer.
B. Stormwater and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the Superintendent. Industrial cooling water or unpolluted process waters may be discharged, on approval of the Superintendent, to a storm sewer, combined sewer or natural outlet.
C. No person shall discharge or cause to be discharged any of the following 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 gasses in sufficient quantity, singly or by interaction with other wastes to 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 milligrams per liter (2 mg/L) as CN in the wastes as discharged to the public sewer;
3. Any waters or wastes having a pH lower than 5.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the sewage works;
4. Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewage works, such as but not limited to, ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
D. No person shall discharge or cause to be discharged the following described substances, materials, water or wastes if it appears likely in the opinion of the superintendent that such wastes can harm either the sewers, sewage treatment process, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property, or constitute a nuisance. In forming his opinion as to the acceptability of these wastes, the superintendent will give the consideration to such factors as to 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, the sewers, capacity of the sewage treatment plant, degree of treatability of wastes in the sewage treatment plant, and other pertinent factors. The substances prohibited are:
1. Any liquid or vapor having a temperature higher than one hundred fifty degrees Fahrenheit (150°F) (65°C);
2. Any water or waste containing fats, wax, grease or oils, emulsified or not, in excess of one hundred (100) mg/l or containing substances which may solidify or become viscous at temperatures between thirty two degrees Fahrenheit (32°F) and one hundred fifty degrees Fahrenheit (150°F) (0° and 65°C);
3. Any garbage that has not been properly shredded. The installation and operation of any garbage grinder with a motor three-fourths (3/4) horsepower or greater shall be subject to review and approval of the superintendent;
4. Any waters or wastes containing strong acid iron pickling wastes or concentrated plating solutions, whether neutralized or not;
5. Any waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such material received in the composite sewage at the sewage treatment works exceeds the limits established by the superintendent for such materials;
6. Any waters or wastes containing phenols or other taste producing or odor producing substances, in such concentrations exceeding limits which may be established by the superintendent as necessary, after treatment of the composite sewage, to meet the requirements of the state, federal or other public agencies or jurisdiction for such discharge to the receiving waters;
7. Any radioactive wastes or isotopes of such halflife or concentrations as may exceed limits established by the superintendent in compliance with applicable state or federal regulations;
8. Any waters or wastes having a pH in excess of nine and five- tenths (9.5);
9. Materials which exert or cause:
a. Unusual concentrations of inert suspended solids, such as, but not limited to, fullers earth, lime slurries, and lime residues, or of dissolved solids, such as, but not limited to, sodium chloride or sodium sulfate;
b. Excessive discoloration, such as, but not limited to, dye wastes and vegetable tanning solutions;
c. Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works;
d. Unusual volume of flow or concentrations of wastes constituting "slugs" as defined in section 8-1-2 of this chapter;
10. 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 other agencies having jurisdiction over discharge to the receiving waters. (1977 Code § 13.02.070)