Mich. Admin. Code R. 325.1755
Rule 255. Water pumped from a dewatering well shall be conveyed to a natural watercourse in a manner that does not cause damage to abutting property, create a hazard, or cause silting in the receiving stream. This water is not considered potable and shall not be used for drinking or domestic purposes. The pumping water level in a dewatering well shall be maintained at the minimum possible depth below the ground surface that will dewater the excavation. Duration of operation shall also be regulated by the contractor to minimize time of pumping to the period actually needed to dewater the excavation effectively. The contractor, consulting engineer, and the owner of the construction project for which the dewatering wells are being drilled shall give due consideration as to what effect lowering the groundwater table will exert on existing wells.
Mich. Admin. Code R. 325.1755