Rates for all services located outside of the corporate limits of the city are computed in the same manner as similar services within the city, except that the rates are increased by a surcharge of 50 percent excluding services provided by contract agreement with a sewer district or association in accordance with Chapter 15.36 BMC. [Ord. 2012-12-061 § 7; Ord. 10093 § 12, 1990; Ord. 8982 § 59, 1981].