§ 51.118  INDUSTRIAL USER CHARGES.
   (A)   Industrial users defined.
      (1)   Any non-governmental user of publicly owned treatment works which discharges more than 25,000 gallons per day of sanitary waste, or a volume of process waste, or combined process and sanitary waste, equivalent to 25,000 gallons per day of sanitary waste.
      (2)   Any non-governmental user of a publicly owned treatment works which discharges wastewater to the treatment works which contains toxic pollutants or poisonous solids, liquids or gases in sufficient quantity either singly or by interaction with other wastes, to injure or interfere with and sewage treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in, or have any adverse effect on, the waters receiving any discharge from the treatment works.
      (3)   All commercial users of an individual system constructed with grant assistance under § 201(h) of the Act, being 33 U.S.C. § 1281(h), and this section.
   (B)   Industrial user charges.
      (1)   Each industrial user, as defined in division (A), shall pay their share of the operation, maintenance, replacement and depreciation costs for treatment of the industrial sewage.
      (2)   Each industrial sewer customer that discharges to the system process wastewater which does not exceed the limits of “normal strength sewage” shall be charged and shall make quarterly payments to the Authority in amounts based on the actual volume and strength of the flow from the premises.
      (3)   Each industrial user that proposes to discharge to the system process wastewater which exceeds the limits of “normal strength sewage” will be required to either provide satisfactory pretreatment to reduce the strength of the wastewater to “normal strength sewage” or pay a surcharge determined by the relative concentration of BOD, suspended solids or other pollutant as compared to “normal strength sewage.”
      (4)   Prior to discharging to the system, process wastewater which exceeds the limits of “normal strength sewage,” a permit must be obtained from the city through the Kalamazoo Lake, Sewer and Water Authority.