Home Articles Mesa Water District Completes Mainline Valve Replacement Project to Ensure a Reliable Water Supply Mesa Water District Completes Mainline Valve Replacement Project to Ensure a Reliable Water Supply Posted: Monday, April 24, 2023 It’s a wrap for phase one of Mesa Water District’s Mainline Valve Replacement Project! One of Mesa Water’s strategic goals is to perpetually renew and improve our infrastructure. This important project replaced 81 mainline valves throughout south Costa Mesa and parts of Newport Beach, including 25 residential valves and 56 commercial valves, to help ensure a reliable water supply. The work required both daytime and nighttime water interruptions, as well as traffic mitigation for the work areas and asphalt repair. We are grateful for your patience and understanding as our crews worked to replace the valves over the past 10 months. The project was completed on schedule – even with all the rain delays – and within budget. Thank you for the privilege of providing you with 100% local, reliable, clean, safe water! For infrastructure updates, visit MesaWater.org/construction.