Section R. 325.1622 - Wells; distances from contamination sourcesRule 122.
(1) A well that furnishes water for any beneficial use shall be located where it is not subject to contamination. Groundwater contaminant movement is influenced by the type of contaminant, groundwater flow direction and velocity, and other hydrogeologic, geologic, and geochemical factors. If available, hydrogeologic data shall be used to select well location. Where possible, a well shall be located upgradient of a potential or known source of contamination. A well shall be located the maximum practical distance from a potential or known source of contamination. The following minimum horizontal distances shall be maintained when locating a well:(a) Eight hundred feet from either of the following:(i) The active work area of a landfill, as defined in R 299.4101.(ii) Land surface application of septage waste, as defined by section 2 of Act No. 181 of the Public Acts of 1986, being §325.312 of the Michigan Compiled Laws.(b) Three hundred feet from any of the following:(i) Land application or subsurface injection of effluent or digested sludge from a municipal wastewater treatment facility.(iii) Petroleum product processing or storage facilities.(iv) Underground or abovegrade storage tank systems of not less than 1100 gallons which are regulated under Act No. 423 of the Public Acts of 1984, as amended, being §299.701 et seq. of the Michigan Compiled Laws, when secondary containment as defined by Act No. 423 of the Public Acts of 1984, as amended, is not provided.(c) One hundred and fifty feet from a preparation or storage area for fertilizers, agricultural chemicals, or other chemicals that might contaminate the soil or groundwater.(d) Fifty feet from any of the following: (i) A buried sewer, other than a sewer that is specified in subdivision (g) of this subrule.(iii) A subsurface disposal field.(v) A sewage pump chamber.(vi) A pressurized sewer.(x) An animal or poultry yard.(xii) Any other wastewater handling or disposal unit or site of liquid wastes draining into the soil.(e) Fifty feet from underground or abovegrade storage tank systems which have a capacity of not less than 1,100 gallons, which are regulated pursuant to the provisions of Act No. 423 of the Public Acts of 1984, as amended, being §299.701 et seq. of the Michigan Compiled Laws, and which have secondary containment as defined in Act No. 423 of the Public Acts of 1984, as amended.(f) Fifty feet from underground or abovegrade storage tank systems which have a capacity of less than 1,100 gallons and which store motor or heating fuels for noncommercial purposes or consumptive use on the premises where the fuel is stored.(g) Ten feet from any of the following: (i) A buried gravity-flow sewer that is constructed of service weight or heavier ductile-iron pipe with watertight joints, schedule 40 PVC plastic with watertight joints, or other material and joints that are approved, in writing, by the director.(ii) A sump, pit, or unfilled space that is below the ground surface, except for a crawl space.(iii) A surface water body, such as a lake, pond, river, or stream.(2) The health officer who is responsible for enforcement of this rule may deviate from the minimum isolation distances in this rule pursuant to the provisions of R 325.1613, either increasing or decreasing the minimum isolation distances for individual well installations.(3) A well that serves a public water supply, as defined pursuant to the provisions of Act No. 399 of the Public Acts of 1976, as amended, being §325.1001 et seq. of the Michigan Compiled Laws, shall be isolated from contamination sources in accordance with requirements specified in R 325.10101 et seq.(4) A well owner shall be responsible for maintaining the isolation distances that are specified in the provisions of R 325.1622 and R 325.1624 for property that is owned by the well owner.Mich. Admin. Code R. 325.1622