“Commercial” means a premises used for commercial or business purposes that discharges a quality of sewage essentially similar to that of a single-family dwelling.

“Industrial” means a premises used for manufacturing or industrial purposes which discharges industrial waste, sanitary waste, and sewage by reason of the manufacturing or industrial process involved, or discharges chemicals or putrescible materials.

“Service unit” means a unit of measure which is equal to the sewer usage of an average single-family unit which, for the purpose of this chapter, is determined to be that of a single-family unit whose average water consumption is 7,500 gallons per month, such unit being used to equate the sewer usage of a commercial customer to a residential customer, or special residential uses to a single-family unit.

“Single-family unit” means a dwelling unit designed, improved, or used as a residence for one family only. Each unit in a multiple-family dwelling or each trailer or mobile home not in a mobile home park shall be a dwelling unit. The average water usage of a single-family unit, for the purposes of this chapter, is determined to be 7,500 gallons per month. [Ord. 87-12-O §§2, 3, 1987; Ord. 82-3-O, 1982. Formerly §13.01.020].