A.   Unpolluted Waters: No person shall discharge or cause to be discharged any unpolluted waters such as stormwater, surface water, groundwater, roof runoff, subsurface drainage or cooling water to any sewer; except, stormwater runoff from limited areas, which stormwater may be polluted at times, may be discharged to the sanitary sewer by permission of the superintendent of the district having jurisdiction in the area.
   B.   Discharge Of Prohibited Water Or Wastes: 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 contaminate the sludge of any municipal system, 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 or have an adverse effect on the waters receiving any discharge from the treatment works.
      3.   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 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, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, woods, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
   C.   Limited Discharges: The following described substances, materials, waters or waste shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger lives, limb, public property or constitute a nuisance. The governing body regulating or supervising any sewer system may set limitations lower than the limitations established in the regulations below if in its opinion such more severe limitations are necessary to meet the above objectives. In forming its opinion as to the acceptability, the governing body will give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, degree of treatability of the waste in the wastewater treatment plant and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the governing body are as follows:
      1.   Wastewater having a temperature higher than one hundred fifty degrees Fahrenheit (150°F) (65° Celsius).
      2.   Wastewater containing more than twenty five milligrams per liter (25 mg/l) of petroleum oil, nonbiodegradable cutting oils, or product of mineral oil origin.
      3.   Wastewater from industrial plants containing floatable oils, fat or grease.
      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.   Any waters or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the governing board for such materials.
      6.   Any waters or wastes containing odor producing substances exceeding limits which may be established by the governing board.
      7.   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the governing board in compliance with applicable state or federal regulations.
      8.   Quantities of flow, concentrations, or both which constitute a "slug", as defined in section 7-2-1 of this chapter.
      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 water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
   D.   Maintenance Of Pretreatment Facilities: Where pretreatment or flow equalizing facilities are provided or required for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his expense.
   E.   Information May Be Required: The governing board may require a user of sewer services to provide information needed to determine compliance with this chapter. These requirements may include:
      1.   Wastewaters discharge peak rate and volume over a specified time period.
      2.   Chemical analyses of wastewaters.
      3.   Information on raw materials, processes and products affecting wastewater volume and quality.
      4.   Quantity and disposition of specific liquid, sludge, oil, solvent or other materials important to sewer use control.
      5.   A plot plan of sewers of the user's property showing sewer and pretreatment facility location.
      6.   Details of wastewater pretreatment facilities.
      7.   Details of systems to prevent and control the loss of the materials through spills to the municipal sewer.
   F.   Methods Of Examination: All measurements, tests and analyses of the characteristics of waters and wastes to which reference is made in this chapter shall be determined in accordance with the latest edition of "Standard Methods For The Examination Of Water And Wastewater", published by the American Public Health Association. Sampling methods, location, times, durations and frequencies are to be determined on an individual basis subject to approval by the district inspector. (Ord. 1980-1, 4-29-1980)