Section R. 325.1604 - Definitions; PRule 104.
(1) "Permanent casing" means durable, impervious pipe placed or driven into the borehole and left in place to maintain the well opening.(2) "Pitless adapter" means a device or assembly of parts which will permit water to pass through the wall of the well casing or extension thereof and which provides access to the well and to the parts of the water supply system within the well in a manner to prevent the entrance of contaminants into the well and the water produced.(3) "Potable water" means water which is free of contaminants in concentrations that may cause disease or harmful physiological effects and which is safe for human consumption.(4) "Pressure tank" means a closed water and air storage container that modulates the water supply system pressure within a selected range.(5) "Priming" means the filling of a pump with water and the action of starting the flow in a pump.(6) "Pumping equipment" means equipment or materials that are used or intended to assist a pump in withdrawing groundwater from a well, including any of the following: (a) Seals and other safeguards to protect the water from contamination.(c) Intake and discharge piping.(d) Controls to provide sanitary water storage facilities and deliver water to a distribution piping system.(7) "Pump room" means an enclosed structure which is either above ground surface or located within or attached to an approved basement and which houses a pump or pumping equipment.(8) "Pumping water level" means the distance measured from the ground surface to the water surface in a well that is being pumped.(9) "PVC" means polyvinyl chloride plastic.Mich. Admin. Code R. 325.1604