Mich. Comp. Laws § 101.14: Drains privately owned; annual charge, lien.

Sec. 14.

The board of public works may charge and collect annually from persons whose premises are connected by private drains with the public sewers, such reasonable sum, not exceeding 2 dollars per year, as they may deem just, in proportion to the amount of drainage through such private drain; and such charge shall be a lien upon the premises, and may be collected by special assessment thereon, or otherwise.