(A) No person shall discharge or cause to be discharged to any public sewers any of the following substances, materials, water, or wastes:
(1) Any gasoline, benzene, naphtha, fuel oil, mineral oil, or other flammable or explosive liquid, solid, or gas;
(2) Any water or waste that contains more than ten milligrams per liter of gases such as hydrogen sulphide, sulfur dioxide, or nitrous oxide;
(3) Any garbage that has not been properly ground or shredded to a degree that all particles will be carried freely under the flow conditions of the sewer and with no particle greater than one-half inch in any dimension;
(4) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, hair and fleshings, entrails, blood, lime slurry, lime residues, chemical residues, paint residues, cannery waste bulk solids, or any other solid or viscous substance capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewer system or sewage treatment facilities;
(5) Any noxious or malodorous gas or substance, which either singly or by interaction with other wastes, is capable of creating a public nuisance or hazard to life or of preventing entry into the public sewers for their maintenance or repair; or
(6) Any water or wastes containing in excess of two milligrams per liter of cyanides as CN.
(B) Unless written approval has been obtained from the city, no person shall discharge or cause to be discharged to any public sewers any of the following:
(1) Any liquid or vapor having a temperature higher than 150°F (65°C);
(2) Any water or waste, acidic or alkaline in reaction, and having corrosive properties capable of causing damage or hazard to structures, equipment, and personnel. Free acids and alkalies in such wastes must be neutralized, at all times, within a permissible range of pH between 5.5 and 10.0;
(3) Any water or wastes containing a toxic or poisonous substance or of high chlorine requirement in sufficient quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, or create any hazard in the receiving waters or storm water overflows or treatment plant effluents;
(4) Waters and wastes containing metallic ions such as copper, zinc, and chromium. Such wastes shall be subject to the control of the city as to volume and concentration of wastes from individual establishments;
(5) Any water or wastes containing strong acids, iron pickling wastes, or concentrated plating solutions, whether neutralized or not;
(6) Any radioactive wastes. The introduction of radioactive wastes in the city sewers shall be permitted only if a special permit is obtained prior to introducing such wastes. In general, the policy of the city will be in accordance with the regulations of the state’s Division of Health;
(7) Concentrated dye wastes, spent tanning solutions, or other wastes which are highly colored, or wastes which are of unusual volume, concentration of solids, or composition, as for example in total suspended solids of inert nature (such as Fuller’s earth) and/or in total dissolved solids (such as calcium chloride, sodium chloride, or sodium sulfate) or unusual in BOD. Such wastes shall be subject to special review by the city as to:
(a) Approval or rejection of admission to the public sewers;
(b) Modification at the point of origin to permit admission; or
(c) Pretreatment by the owner to permit admission.
(8) Any water or waste which by interaction with other waste or waste in the public sewer system releases obnoxious gases; or develops color of undesirable intensity; or forms suspended solids in objectionable concentration; or creates any other condition deleterious to structures and sewage treatment processes. Such waters and wastes shall be subject to control or shall be barred from the public sewer system as determined by the city;
(9) Any water or waste containing emulsified oil and/or grease exceeding an average of 100 milligrams per liter of either soluble matter; or
(10) Any water or waste containing phenols or other materials which would cause taste or odors in water supplies.
(Prior Code, § 710.090) (Ord. 204A, passed 8-9-1983)