§ 98-87. Restricted use of the public sewers.

(a)

No person shall discharge or cause to be discharged any unpolluted waters such as stormwater, groundwater, roof runoff, subsurface drainage, cooling water or unpolluted industrial process waters to any sanitary sewer.

(b)

No person shall discharge or cause to be discharged any sanitary wastewater into a storm sewer system.

(c)

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 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 waste treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the wastewater treatment plant.

(3)

Any waters or wastes having a pH lower than 5.5 or greater than 9.0, or having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the wastewater works.

(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 wastewater facilities such as, but not limited to, ashes, bones, 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, milk containers, etc., either whole or ground by garbage grinders.

(5)

Any cooling or condensing waters, unless a NPDES permit is obtained from the environmental protection division (EPD).

(d)

The following described substances, materials, waters or waste shall be limited in discharges to municipal systems to concentrations or quantities that will not harm either the sewers, wastewater treatment process or equipment; will not have an adverse effect on the receiving stream; and will not otherwise endanger lives, limb, public property or constitute a nuisance. The limitations or restrictions on materials or characteristics of waste or wastewater discharged to the sanitary sewer which shall not be violated without approval of the city are as follows:

(1)

Wastewater having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius) or wastewater which will elevate the temperature of the influent to the publicly owned treatment works (POTW) to 104 degrees Fahrenheit (40 degrees Celsius) or higher.

(2)

Wastewater containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils or product of mineral oil origin.

(3)

Wastewater containing more than 75 milligrams per liter of oils, fat, grease or wax, whether emulsified or not, or containing substances which may solidify or become viscous at temperatures between 32 degrees Fahrenheit (0 degrees Celsius) and 150 degrees Fahrenheit (65 degrees Celsius).

(4)

Any garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers.

(5)

All industrial discharges to the city sewer system must comply with the Federal Industrial Pretreatment Standards (40 CFR 403) and those industrial pretreatment standards developed by the state environmental protection division.

(6)

Any waters or wastes containing taste or odor-producing substances exceeding limits which may be established by the city.

(7)

Any radioactive wastes or isotopes of such half-life or concentrations as may exceed limits established in compliance with applicable state or federal regulations.

(8)

Quantities of flow, concentrations, or both, which constitute a slug.

(9)

Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.

(10)

Any waters or wastes which, by interaction with other waters or wastes in the public sewer system, release obnoxious gases, form solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.

(11)

Wastewater containing more than 15 mg/l of total phosphorus.

(12)

Wastewater containing more than 20 mg/l of total Kjeldahl nitrogen.

(13)

Materials which exert or cause:

a.

Any unusual concentrations of inert suspended solids (such as, but not limited to, fuller's earth, lime slurries and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate).

b.

Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).

c.

Unusual biochemical oxygen demand (BOD above 300 mg/l), total suspended solids load (TSS above 350 mg/l) or chlorine demand in such quantities as to constitute a significant load on the sewage treatment plant.

(14)

Wastewater which exceeds the mineral limits shown in the table contained in section 98-95.

(Ord. No. 2008-0005, 5-12-2008)