Section 15-7-508 - Rates; general; amounts; special(a) Any city or town borrowing money or receiving grants and improving, constructing or acquiring and improving a sewerage system, shall collect a charge from the users of the system at a rate sufficient to: (i) Pay the cost of operating and maintaining the system; (ii) Provide an adequate depreciation fund; (iii) Pay the principal and interest on the bonds issued; and (b) Any city or town owning and operating a sewerage system constructed or acquired under the provisions of any law may provide by ordinance that the users of the system pay a service rate sufficient to pay the cost of operating and maintaining the system and to provide an adequate depreciation fund. (c) Any city or town may fix special rates as provided in W.S. 15-7-407.