Mich. Comp. Laws § 333.12721: Adding fluoride to water.

Sec. 12721.

A state department, board, commission, or agency shall not order a county, city, township, village, or any combination thereof to add fluoride to water which is supplied to the public that may be consumed by human beings.

A county, city, township, village or any combination thereof which supplies water to the public may add fluoride to the water, in a manner and amount to be prescribed by the department, unless the addition of fluoride is rejected by an ordinance of the or by a majority of the electors of the county, city, township, village or any combination thereof.