This award-winning project included improvements to expand the Alvarado Water Treatment Plant capacity by 67 percent to 200 MGD. The City of San Diego’s goal for moving from chlorine disinfection to ozone was to enable the facility to meet more stringent drinking water standards and regulations, and to remove trace organic compounds while producing less disinfection byproduct. A 13,000-square-foot, three-story, 18,000-cubic-yard concrete ozone building was constructed to house a new ozone system.