Is a RPZ Backflow Device ok to use in a underground pit if a floor drain is installed to remove any ground waterseepage into pit or discharge from RPZ

Illinois does not allow for any type of backflow preventer to be placed underground or in a pit. Even if the pit has a sump pit/pump, floor drain, etc.

Section 890.1130 Protection of Potable Water

g) Installation of Devices or Assemblies.

5) Double Check Valve, and Reduced Pressure Principle Backflow Preventer Assemblies. No in-line double check valve backflow preventer assembly (DCV) or reduced pressure principle backflow preventer assembly (RPZ) shall be located more than 5 feet above a floor, or be installed where it is subject to freezing or flooding conditions.