It is unlawful for any person to introduce any of the following into the sewers of the city:

A. Any flammable or explosive liquid or solid;

B. Any ashes, cinders, sand, mud, straw, shavings, glass, rags, feathers, tar, plastics, wood, or any other solid or viscous substance capable of obstructing the flow in the city sewer or other interference with or damage to the proper operation of the city’s sanitary sewage disposal system or treatment facility;

C. Any waters or waste having a pH lower than 5.5 or higher than 9.0 or having any other corrosive or caustic property capable of causing damage or hazard to structures, equipment or personnel of the city, or other property of the city;

D. Any wastes from the cutting of cloth or cloth garments, dye, or other chemicals used in the manufacturing process of cloth or cloth garments;

E. Any water or waste containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any sewage treatment process of the city or constituting a hazard to persons or animals, or to create any hazard in the receiving waters of the sewage treatment plant of the city;

F. Garages, service stations, washracks or other establishments shall be equipped, as directed by the city, with suitable grease, gravel, or grit traps and shall be inspected by the superintendent before the same may be connected to the sanitary sewer system. Such traps shall be maintained by the owner at his or her expense in a manner so as to prevent such material from entering the sanitary sewer system and shall be subject to periodic inspection by the city;

G. When an owner of property has industrial or commercial waste of unusual strength or character, the city reserves the right to reject the application for service, or to require certain preliminary treatment of such waste and require the owner to pay such charges as may be fixed by the city for such waste disposal. Where preliminary treatment facilities may be required, they shall be maintained continuously by the owner at his or her expense in satisfactory and effective operation. The city may also require of such owner at his or her expense a suitable control manhole to facilitate observation, sampling, and measurement of the wastes;

H. Any stormwater, surface water, ground water, roof runoff, subsurface drainage, uncontaminated cooling water or unpolluted industrial process waters;

I. Any water or wastes containing oils, fats or greases, emulsified or not, in excess of one hundred (100) mg/L;

J. Any garbage that has not been properly shredded;

K. Any water or wastes which by themselves or when mixed with other wastewaters and treated by the city cause the limits of the city’s discharge permit to be exceeded; including metals, solids, BOD, phenols, or toxic wastes. (Prior code § 4.112)