Mich. Comp. Laws § 119.61
If a majority of the electors voting thereon at any election in 2 or more of the above named counties, which are contiguous, shall vote "yes" on the proposal, then all the counties so approving shall constitute a metropolitan district, and the Huron-Clinton metropolitan authority shall be a corporation having all the powers, duties and obligations provided for in this act.
The governing board shall consist of the 2 commissioners appointed by the governor and of the elected commissioners from the counties so approving.
If a majority of the electors in any county should vote "no" on the approval of a Huron-Clinton metropolitan authority, the project may again be submitted to the electors in such county or counties, by their respective boards of supervisors or by petitions signed by at least 10 per cent of the electors therein. Such county or counties shall become part of the metropolitan district whenever at a later election a majority of the electors in such county or counties shall vote "yes".
MCL 119.61