Each local government unit shall adopt a system of charges for the use and availability of the metropolitan disposal system which will assure that each recipient of waste treatment services within or served by the unit will pay its proportionate share of the costs allocated to the unit by the council under section 473.517, as required by the federal Water Pollution Control Act amendments of 1972, and any regulations issued pursuant thereto. Each system of charges shall be submitted to the council if requested by the council.