Mich. Admin. Code R. 560.411
Rule 411. A registered water well drilling contractor under the supervision of the owner or the owner's designated representative shall perform a yield or performance test to demonstrate that water can be withdrawn from an on-site water supply well for drinking and household purposes at a sustained pumping rate which is not less than 10 gallons per minute (gpm) and which meets or exceeds peak water demand for not less than a 4-hour period of time. If an on-site water well cannot sustain a capacity that meets the peak water demand, then the department shall require demonstration of a combination of the known well yield and storage facilities that can furnish water at a delivery rate sufficient to meet the peak water demand.
Mich. Admin. Code R. 560.411