Mich. Comp. Laws § 125.473: Catch-basins.

Sec. 73.

Catch-basins. In the case of dwellings where, because of lack of city water supply or sewers, sinks with running water are not provided inside the dwellings, 1 or more catch-basins or some other approved convenience for the disposal of waste water, as may be necessary in the opinion of the health officer or such other appropriate public official as the mayor may designate, shall be provided in the yard or court, level with the surface thereof and at a point easy of access to the occupants of such dwelling.