Section R. 325.1637 - Construction of bedrock wellsRule 137.
(1) Where bedrock is encountered within 25 feet of the ground surface, an oversized borehole shall be drilled and the permanent casing shall be grouted with neat cement for a minimum depth of 25 feet.(2) In an area where a well can be developed only in fractured, jointed, or cavernous bedrock, the casing may terminate in the formation if there is not less than 25 feet of soil above the bedrock, if there is no record of the bedrock containing contaminated water, and if geologic conditions offer no natural direct surface or near surface water inlets into the bedrock aquifer. Where there is less overburden and deeper strata will not produce potable water, the well owner shall obtain written approval from the health officer for water treatment and well construction features that are necessary to provide a safe supply.(3) Hydraulic fracturing of bedrock is not permitted without the prior written approval of the health officer.Mich. Admin. Code R. 325.1637