(A) No person shall discharge or cause to be discharged, either directly or indirectly to the sewerage system, any of the following described substances, materials, waters, or wastes.
(B) This list is subject to revisions as required to meet current water quality standards imposed by state or federal agencies:
(1) Any liquid or vapor having a temperature higher than 150°F;
(2) Any gasoline, benzine, naphtha, fuel oil, mineral oil, or other volatile, flammable, or explosive liquid, solid, or gas;
(3) Any noxious or malodorous gas or substance which, either singly or by interaction with other wastes, is capable of creating a public nuisance or a hazard to life or of preventing entry into the sewers for maintenance and repair;
(4) Any waters or wastes having a pH lower than 5.5 or higher than 9.0, or having any other corrosive property of causing damage or hazard to structures, equipment, or personnel of the sewerage system;
(5) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, hair and fleshings, entrails, lime or chemical or paint residues, cannery waste bulk solids, or any other solid objects or viscous substance capable of causing obstruction to the flow operation of the sewerage system;
(6) Any waters or wastes containing a toxic or poisonous substance 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 of the sewage system;
(7) Any water or wastes containing emulsified oil or grease exceeding on analysis an average of 50 milligrams of oil and grease per liter determined as total soluble matter;
(8) Any garbage that has not been properly shredded to a degree that all particles will be carried freely under the flow direction of the sewer and with no particle greater than one-half inch in any dimension;
(9) Any water or wastes containing suspended solids of such character of quality that unusual attention or expense is required to handle such materials at the sewage treatment plant, or having a chlorine demand greater that 25 parts per million;
(10) Any waste containing substances that would result in a violation of the NPDES permit;
(11) No statement contained in this section shall be interpreted as preventing any special agreement or arrangement between the city and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the city for treatment. In all such cases, the provisions set forth in the city ordinance establishing sewer service charges will be the governing factors in any contracts entered into; and
(12) (a) Grease, oil, and sand interceptors shall be provided when, in the opinion of the city, they are necessary for proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, and other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be located as to be readily and easily accessible for cleaning and inspection.
(b) Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, water-tight, and equipped with easily removable covers which when bolted in place shall be gas-tight and water-tight. Where installed, all grease, oil, and sand interceptors shall be maintained by the owner at his or her expense, in continuous efficient operation at all times.
(1982 Code, § 50.32) (Ord. 1974-26, passed 10-10-1974; Ord. 2004-20, passed 7-12-2004; Ord. 2013-2, passed 2-11-2013) Penalty, see § 50.999