Mich. Comp. Laws § 324.4503
The state shall borrow the sum of $335,000,000.00 and issue the general obligation bonds of the state, pledging the faith and credit of the state for the payment of the principal and interest on the bonds, for the purpose of providing money for the planning, acquisition, and construction of facilities for the prevention and abatement of water pollution, consisting of trunk and interceptor sewers, sewage treatment plants and facilities, improvements and additions to existing sewage treatment plants and facilities, and such other structures, devices, or facilities as will prevent or abate water pollution, and for the making of grants, loans, and advances to municipalities, in accordance with conditions, methods, and procedures established by law.
MCL 324.4503