§ 53.081 WASTEWATER SERVICE CHARGES; GENERALLY; MEASUREMENT OF FLOW FOR COMPUTATIONS; FORMULA.
   (A)   (1)   (a)   The wastewater service charge for the use of and for service supplied by the wastewater facilities of the city shall consist of a basic user charge for operation and maintenance plus replacement, a debt service charge and a surcharge, if applicable.
         (b)   The debt service shall be computed by dividing the annual debt service of all outstanding loans by the number of users. Through further divisions, the monthly debt service charges can be computed.
         (c)   The basic user charge shall be based on water usage as recorded by water meters and/or sewage meters for wastes having the following normal concentration:
            1.   A five-day, 20°C biochemical oxygen demand of 280 mg/l; and
            2.   A suspended solids (SS) content of 330 mg/l.
      (2)   It shall consist of operation and maintenance costs, plus replacement and shall be computed as follows:
         (a)   Estimate the projected annual revenue required to operate and maintain the wastewater facilities including a replacement fund for the year, for all works categories;
         (b)   Compute costs per 1,000 gallons for normal sewage strength; and
         (c)   Compute surcharge costs per 1,000 gallons per mg/l in excess of normal sewage strength for BOD and SS.
      (3)   A surcharge will be levied to all users whose waters exceed the maximum concentrations for BOD (280 mg/l) and SS (330 mg/l). The surcharge will be based on water meters and/or sewage meters for all wastes which exceed the 280 mg/l, 330 mg/l, BOD and SS, respectively. Division (C) below specifies the procedure to compute a surcharge.
      (4)   (a)   The adequacy of the wastewater service charge shall be reviewed annually by the City Administrator for the city in the annual audit report. The wastewater service charge shall be revised periodically to reflect a change in debt service or a change in operation and maintenance costs including replacement costs.
         (b)   The city shall revise the user charges to accomplish the following:
            1.   Maintain the proportionate distributions, operation and maintenance costs among users and user classes as required herein; and
            2.   Generate sufficient revenue to pay the total operation and maintenance costs necessary to properly operate and maintain the treatment works.
         (c)   Apply excess revenues collected from a class of users to the cost of operation and maintenance attributable to that class for the next year and adjust the rate accordingly.
(Prior Code, § 23-42)
   (B)   The volume of flow used for computing basic user charges and surcharges shall be the metered water consumption of each defined unit for each corresponding month to the lowest even increment of 1,000 gallons. For residential customers only, the city shall set, by resolution, the maximum number of gallons of water per month a unit may consume and still qualify for the basic user charges and surcharges.
      (1)   If the person discharging wastes into the public sewers procures any part, or all, of his or her water from sources other than the public waterworks system, all or a part of which is discharged into the public sewers, the person shall install and maintain, at his or her expense, water meters of a type approved by the city for the purpose of determining the volume of water obtained from these other sources.
      (2)   Devices for measuring the volume of waste discharged may be required by the city if these volumes cannot otherwise be determined from the metered water consumption records.
      (3)   Metering devices for determining the volume of waste shall be installed, owned and maintained by the person. Following approval and installation, the meters may not be removed, unless service is cancelled, without the consent of the city.
(Prior Code, § 23-43)
   (C)   The wastewater service charge shall be computed by the following formula:
TC = DS + AF + UR + SC
      (1)   TC = Total amount of wastewater charges ($) per billing period.
      (2)   DS = Debt service charge, if any.
      (3)   AF = Administrative fee for all related administrative costs.
      (4)   UR = User rate for operation, maintenance and replacement (§ 53.083).
      (5)   SC = Amount of surcharge (§ 53.082).
      (6)   Bc = $0.11/BOD5.
      (7)   Sc = $0.0.06/# suspended solids.
      (8)   B = BOD5 - 280 mg/l.
      (9)   S = SS - 330 mg/l.
(Prior Code, § 23-44)
(Ord. 554, passed - -; Ord. 759, passed - -; Ord. 786, passed - -)