A. In developing a schedule of charges for wastewater service, costs of service shall be allocated to customer classes according to the service requirements of each class. Cost allocations shall take into account the volume of wastewater contributed, strength of wastewater, number of customers and other relevant factors. The following classes of service shall be recognized by the utility: single family, multifamily, commercial, government, and industrial.

1. Volume costs shall vary directly with quantity of wastewater contributed. Strength costs include costs associated with biochemical oxygen demand (BOD), total suspended solids (TSS) and phosphorus (P). Customer costs shall vary in proportion to the number of customers served by the system.

2. Service rates:

a. Service Charge. The service charge shall recover all utility billing costs such as billing and collecting costs and meter maintenance and customer related l/l costs.

b. Volume Charges. Volume charges shall recover volume and strength costs associated with normal domestic wastewater.

c. Extra Strength Surcharge. Customers that have sewage concentrations that exceed the following thresholds: biochemical oxygen demand, three hundred mg/l; total suspended solids, three hundred twenty-five mg/l; and phosphorus, ten mg/l shall be charged an extra strength surcharge. (Ord. 611 § 6, 1998: Ord. 414 § 3, 1982)