Completed backflow prevention repair at a commercial property in Sanford today. The reduced pressure zone assembly was leaking from the first check valve and relief valve discharge was constant. Backflow prevention repair involved replacing both check valve internals and the relief valve diaphragm. Tested differential pressures across all components to ensure proper operation. The backflow prevention repair also required recalibrating the system to meet North Carolina state requirements. Property manager was pleased to have their water system protection restored quickly. Critical repair that protects the public water supply from contamination.