Mich. Comp. Laws § 123.371
Rates for services furnished by any garbage disposal equipment system shall be fixed by ordinance. The rates charged shall be sufficient to provide for the payment of the expenses of administration and operation and such expenses of maintenance of the system as may be necessary to preserve the same; and to provide for the payment of principal and interest of all bonds payable therefrom as and when the same become due and payable; and for the creation of any reserve therefor, as required in the ordinance; and to provide for such other expenditures and funds as the ordinance may require. Rates charged for the services furnished pursuant to this act shall not be subject to the supervision or regulation by any state bureau, board, commission or like instrumentality or agency thereof.
MCL 123.371