(A) Restrictions on discharges into sewer; standards. All disposal by any person into the sewer system is unlawful except those discharges in compliance with federal standards promulgated pursuant to 33 U.S.C. §§ 1251 et seq. and more stringent state and local standards.
(1978 Code, § 13.08.290)
(B) Discharge of stormwater and industrial cooling water into sanitary sewer prohibited. 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.
(1978 Code, § 13.08.300)
(C) Discharge of stormwater and industrial cooling water. 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 city. Industrial cooling water or unpolluted process waters may be discharged on approval of the city and other agencies having lawful jurisdiction, to a storm sewer, combined sewer or natural outlet.
(1978 Code, § 13.08.310)
(D) Prohibited discharges; designated. 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, 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; and
(3) Any waters or wastes having a pH lower than 6.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage works; or
(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, underground garbage, whole blood, paunch manure, hair and fleshings, entrails, and paper dishes, cups, milk containers, and the like, either whole or ground by garbage grinders.
(1978 Code, § 13.08.320)
(E) Discharge of hazardous or damaging substances prohibited; prohibited substances designated.
(1) (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 city 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.
(b) In forming its opinion as to the acceptability of these wastes, the city 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 maximum limits established by regulatory agencies.
(2) The substances prohibited are:
(a) Any liquid or vapor having a temperature higher than 150°F (65°C);
(b) Any waters or wastes containing toxic or poisonous materials; 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° and 150°F (0 and 65°C);
(c) 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 city;
(d) Any waters or wastes containing strong acid, iron-pickling wastes, or concentrated plating solutions, whether neutralized or not;
(e) Any waters or wastes containing iron, chromium, copper, zinc, or 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 city for such materials;
(f) Any waters or wastes containing phenols or other taste or odor-producing substances, in such concentrations exceeding limits which may be established by the city as necessary after treatment of the composite sewage, to meet the requirements of the state, federal, or other public agencies of jurisdiction for such discharge to the receiving waters;
(g) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the city in compliance with applicable state or federal regulations;
(h) Any waters or wastes having a pH in excess of 9.0;
(i) Any mercury or any of its compounds in excess of 0.0005 mg/l as Hg at any time except as permitted by the city in compliance with applicable state and federal regulations;
(j) Any cyanide in excess of 0.025 mg/l at any time except as permitted by the city in compliance with applicable state and federal regulations;
(k) Materials which exert or cause:
1. Unusual concentrations of inert suspended solids (such as, but not limited to, fuller’s earth, lime slurries, and lime residues) or if dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate);
2. Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions);
3. Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; and
4. Unusual volume of flow or concentrations of wastes constituting slugs as defined in § 50.065.
(l) Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of agencies having jurisdiction over discharge to the receiving waters.
(1978 Code, § 13.08.330)
(Ord. 503, passed - -1977) Penalty, see § 50.999