Sec. 26-133. Discharges into public sewers--Types not permitted.


No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer.


(a)   No person shall discharge or cause to be discharged any stormwater, surface water, ground water, roof run-off, interior or exterior footing drainage or subsurface drainage, to any sanitary sewer. Uncontaminated cooling water and unpolluted industrial process waters may be discharged to a sanitary sewer only if expressly authorized by the city engineer.


(b)   Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid or gas.


(c)   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, including but not limited to the following (in case of conflict, the most stringent condition shall apply):


(1) Cyanides in excess of two (2) mg/l as CN in the wastes as discharged to the public sewer; or


(2) Wastes in concentrations or quantities in excess of that set forth in a discharge permit issued to a user as provided herein;


(3) Wastes in excess of maximum concentration established by NDEC and/or EPA for certain wastes, including but not limited to the following: arsenic, cadmium, chromium, copper, cyanide, lead, mercury, nickel, zinc, and identifiable chlorinated hydrocarbons.


(d)   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.


(e)   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, towels, milk containers, etc.; either whole or ground by garbage grinders.


(f)   Any waters or wastes having:


(1) A five-day biochemical oxygen demand greater than three hundred sixty-five (365) mg/l; or


(2) Containing more than four hundred sixty-four (464) mg/l of suspended solids; or


(3) Having an average daily flow greater than two (2) per cent of the average sewage flow of the city;


Shall be subject to the review of the city engineer. Where necessary in the opinion of the city engineer, the owner shall provide, at his expense, such preliminary treatment as may be necessary to:


(1)       Reduce the biochemical oxygen demand to three hundred sixty-five (365) mg/l; or


(2) Reduce the suspended solids to four hundred sixty-four (464) mg/l; or


(3) Control the quantities and rates of discharge of such waters or wastes.


Plans, specifications, and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the city engineer and no construction of such facilities shall be commenced until said approvals are obtained in writing.


Source:  Ord. No. 3014, 15, 10-5-81; Ord. No. 3587, 3, 9-6-88