Section R. 325.1655 - Pump installation; water service linesRule 155.
(1) The buried portion of a water service line between the well casing and the pressure tank in any installation shall be under positive pressure at all times. If a check valve is installed in the water line between the well casing and the pressure tank, the water line between the well casing and the check valve shall be in compliance with the requirements for a suction line pursuant to the provisions of R 325.1654.(2) Plastic water service line material shall have a minimum rated working pressure of 160 pounds per square inch, shall be in compliance with ASTM specification D 2239-89, D 2737-89, D 2662-89, D 2666-89, D 1785-91, or D 2241-89, which specifications are adopted by reference in R 325.1610.Mich. Admin. Code R. 325.1655