Perris II Desalter Corrosion Repair

The Eastern Municipal Water District is preparing to replace the entire reverse osmosis feed piping system at its Perris II Desalter facility due to severe microbiologically influenced corrosion detected in the existing stainless-steel components. Laboratory analysis confirmed that the corrosion cannot be mitigated through standard disinfection or chemical treatments, necessitating a full replacement with materials engineered to resist MIC. This project will eliminate persistent leaks and structural degradation in the feed lines, ensuring reliable operation of the desalter plant that produces drinking water from brackish groundwater. In addition to the piping replacement, three unlined stainless steel cartridge filters will be upgraded and a pressure sustaining valve will be installed to stabilize excessive vibration in the adjacent concentrate discharge piping, improving overall system integrity and longevity. The project directly benefits EMWD ratepayers by safeguarding the quality and continuity of their water supply, preventing potential service disruptions and minimizing long-term maintenance costs associated with ongoing corrosion damage. All work will be performed at the Perris II Desalter facility located in Menifee, California, with technical oversight provided by the district’s Water Resources Specialist Assistant I, Martha Vilchis. Although the solicitation has not yet been issued, the project is publicly forecasted with a posted date of July 10, 2026, and is anticipated to proceed through standard procurement procedures to secure qualified contractors for the necessary infrastructure upgrades.