Mich. Comp. Laws § 280.498

Sec. 498. Whenever the water resources commission or successor agency has determined that pollution exists in a county drain which services any city, village or township or any combination thereof and has issued an order of determination or permit to such public corporation for abatement thereof then a petition under this chapter may be filed in accordance with section 463 by any one such city having greater than 500,000 population.