A.   Discharge Prohibited: 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 (air conditioning) to any sewer.
   B.   Unpolluted Drainage: Stormwater and all other drainage shall be discharged to such sewers as are specifically designated as storm sewers, or to a natural outlet approved by the appropriate regulatory agencies. Unpolluted industrial cooling water or process waters may be discharged, on approval of the state or federal regulatory agency, to a storm sewer or natural outlet.
   C.   Prohibited Discharges: No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewer:
      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. Any toxic pollutants which cause an increase in the cost of managing the effluent or the sludge of the town treatment works shall pay for such incurred costs.
      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, 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.   Septic tank wastes.
   D.   Limited Discharges: The following described substances, materials, waters, or wastes shall be limited in discharge to municipal systems to concentrations or quantities which will not harm either the sewer, 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 department of environmental quality (DEQ) may set limitations lower than the limitations established in the regulations below if, in their opinion, such more severe limitations are necessary to meet the above objectives. In forming the opinion as to the acceptability, the DEQ and/or town engineer will give consideration to such factors as the quantity of waste in relation to flows and velocities in the sewers, materials of construction of the sewer, 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 wastewater discharged to the sanitary sewer which shall not be violated without approval of the director of public works and DEQ are as follows:
      1.   Wastewater having a temperature higher than one hundred fifty degrees Fahrenheit (150°F) (65°C).
      2.   Wastewater containing more than twenty five milligrams per liter (25 mg/l) of petroleum oil, biodegradable cutting oils, or products of mineral origin.
      3.   Wastewater from industrial plants containing floatable oils, fat, or grease.
      4.   Any "garbage" that has not been properly shredded (see definition in section 10-1-1 of this chapter). 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 arsenic, iron, chromium, copper, mercury, zinc and similar objectionable or toxic substances to such a degree that any such material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the state or federal regulatory agency for such materials.
      6.   Any waters or wastes containing odor producing substances exceeding limits which may be established by the state or federal regulatory agency.
      7.   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the state or federal regulatory agency in compliance with applicable state or federal regulations.
      8.   Quantities of flow, concentration, or both which constitute a "slug" as defined in section 10-1-1 of this chapter.
      9.   Waters or wastes containing substances which are not amenable to treatment processes employed, or are amenable to treatment only to such a degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving water.
      10.   Any waters or wastes which, by interaction with other waters or wastes in the public sewer system, release obnoxious gases, from suspended solids which interface with the collection system, or create a condition deleterious to structures and treatment processed.
      11.   Any waters or wastes containing DDT, PBB, PCB, or other carcinogenic compounds to such a degree that any such materials received in the composite wastewater at the wastewater treatment facility exceeds the limits established by the state or federal regulatory agency for such materials.
   E.   Authority To Reject, Require Pretreatment Or Control Quantity: If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which contain the substances or possess the characteristics enumerated in subsection D of this section, and in the judgment of the state or federal regulatory agency may have a deleterious effect upon the wastewater facilities, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the director of public works may:
      1.   Reject the wastes;
      2.   Require pretreatment to an acceptable condition for discharge to the public sewers;
      3.   Require control over the quantities and rates of discharge; and/or
      4.   Require payment to cover the added cost of handling and treating the wastes not covered by the existing taxes or sewer service charges under the provisions of chapter 4 of this title.
When considering the above alternatives, the director of public works shall give consideration to the economic impact of each alternative on the discharger. If the director of public works permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the director of public works and the Montana department of health and environmental sciences.
   F.   Interceptors:
      1.   Required: Grease, oil and sand interceptors shall be provided when, in the opinion of the director of public works, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts, as specified in subsection D3 of this section, or any flammable wastes, sand, or other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units.
      2.   Type, Capacity, And Location: All interceptors shall be of a type and capacity approved by the director of public works and shall be located as to be readily and easily accessible for cleaning and inspection. All interceptors must be reviewed and approved by the Montana department of health and environmental sciences.
      3.   Maintenance; Records: In the maintaining of interceptors, the owner shall clean and dispose of collected materials, and shall maintain records of the dates, and means of disposal which are subject to review by the director of public works.
      4.   Removal, Hauling Of Collected Material: Any removal and hauling of the collected material not performed by the owner's personnel must be performed by currently licensed waste disposal firms.
   G.   Maintenance Of Pretreatment Or Flow Equalizing 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.
   H.   Control Manhole: When required by the director of public works, the owner of any property serviced by a building sewer carrying industrial waste or excess flows, BOD, or TSS shall install a suitable structure together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling and measurement of the wastes. Such structures, when required, shall be accessible and safely located, and shall be constructed in accordance with plans approved by the director of public works. The structure shall be installed by the owner at his expense, and shall be maintained by him so as to be safe and accessible at all times.
   I.   Requirement To Provide Information: The director of public works 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 material 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 losses of materials through spills to the town sewer.
   J.   Measurement Of Water Characteristics: 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 the approval of the state or federal regulatory agency.
   K.   Special Agreement And/Or Arrangements Authorized: No statement contained in this section shall be construed as preventing any special agreement or arrangement between the town and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the town for treatment. (Per motion dated 3-12-2009)