Mich. Comp. Laws § 324.4303
The legislative body of a local unit of government or the respective legislative bodies of the local units of government who have agreed to jointly own and operate waterworks systems, intercepting sewers, or sewage treatment plants, may create a separate board or may designate certain officials of the local unit or units of government to have the supervision and control of the waterworks systems, intercepting sewers, transfer stations, or sewage and refuse and garbage processing or disposal plants. The legislative body, respective legislative bodies, or the board may make all necessary rules governing the use, operation, and control of the facilities and systems. The legislative body or respective legislative bodies may establish just and equitable rates or charges to be paid to them for the use of the waterworks system or disposal or processing plant and system by each person whose premises are served, and the rates or charges may be certified to the tax assessor and assessed against the premises served and collected or returned in the same manner as other county or municipal taxes are certified, assessed, collected, and returned.
MCL 324.4303