(A) Basis for wastewater service charges. 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, a debt service charge and applicable surcharges.
(B) Basic user charge. The basic user charge is levied on all users to recover the operation and maintenance costs (O & M) plus replacement costs (R) and shall be based on water usage as recorded by water meters or sewage meters for wastes having the following normal domestic concentrations:
(1) A five-day, 20°C biochemical oxygen demand (BOD) of 204 mg/l; and
(2) A suspended solids content of 240 mg/l.
(C) Basic user charge computation. The basic user charge shall be computed as follows:
(1) Estimate the annual wastewater volume, pounds of BOD, and pounds of SS to be treated;
(2) Estimate the projected annual revenue required to operate and maintain the wastewater facilities, including a replacement fund for the year, for all works categories;
(3) Proportion the estimated O & M plus R costs to each use class by volume, BOD, and SS;
(4) Proportion the estimated O & M plus R costs to wastewater facility categories by volume, BOD and SS;
(5) Compute costs per 100 gallons for normal domestic strength sewage; and
(6) Compute surcharge costs per pound for BOD and SS concentrations in excess of normal domestic strengths.
(D) Debt service charges. The debt service charge is computed by apportioning the annual debt service as a charge per 100 gallons.
(E) Surcharge.
(1) A surcharge will be levied to all users whose waters exceed the normal domestic concentrations of BOD (204 mg/l) and SS (240 mg/l). The surcharge will be based on water usage as recorded by water meters or sewage meters for all wastes which exceed the 204 mg/l and 240 mg/l concentrations for BOD and SS respectively.
(2) The concentration of wastes used for computing surcharges shall be established by waste sampling. Waste sampling shall be performed as often as may be deemed necessary by the Utility Superintendent and shall be binding as a basis for surcharges.
(F) Review of service charges.
(1) The adequacy of the wastewater service charge shall be reviewed, not less often than annually, by certified public accountants for the city in the annual audit report.
(2) The wastewater service charge shall be revised periodically to reflect a change in local capital costs or O & M plus R costs.
(G) Notification of rate. The users of the wastewater treatment services will be notified annually, in conjunction with a regular bill, of the rate and that portion of the user charges which are attributable to the wastewater operation and maintenance, replacement, and debt service.
(1978 Code, § 13.08.420) (Ord. 503, passed - -1977; Ord. 91-10, passed - -1991)