Mo. Rev. Stat. § 204.652
As an alternative to all other methods provided by law or charter, the governing body of any sewer district or reorganized sewer district organized and operated under this chapter or chapter 249 or any metropolitan sewer district organized under the constitution of this state, may make, or cause to be made, improvements that confer a benefit upon property within a sanitary sewer improvement area under sections 204.650 to 204.672. The governing body of such district may issue temporary notes and revenue bonds under sections 204.650 to 204.672 to pay for all or part of the cost of such improvements. An improvement may be combined with one or more other improvements for the purpose of issuing a single series of revenue bonds to pay all or part of the cost of the sanitary sewer improvement area's improvements, but separate funds or accounts shall be established within the records of the district for each improvement project as provided in sections 204.650 to 204.672. Such district shall make assessments and may impose user fees on the property located within the sanitary sewer improvement area, in addition to any other fees or charges imposed by the district to provide services or pay debt. The district shall use the moneys collected from such assessments and user fees from a sanitary sewer improvement area to reimburse the district for all amounts paid or to be paid by it as principal of and interest on its temporary notes and revenue bonds issued for the improvements made in the sanitary sewer improvement area.
§ 204.652, RSMo