City of Tustin PFAS Treatment System and Influent Conveyance
- Owner:
- Orange County Water District
- Location:
- Tustin, California
- Completion:
- 2025
- Designer:
- Jacobs Engineering
- Contractor:
- Caliagua, Inc.
- Photography:
- Courtesy of Caliagua, Inc.
Butier Engineering, Inc.—in collaboration with Orange County Water District (OCWD) and the City of Tustin—is providing construction management, field QA/QC, and geotechnical and materials testing services (Ninyo & Moore) for this critical water treatment project. Portions of Tustin’s groundwater supply have been impacted by per- and polyfluoroalkyl substances (PFAS) that are prevalent in the environment and commonly used in various consumer, commercial, and industrial products. OCWD and the City of Tustin are working together to implement a new treatment system at the existing Main Street Water Treatment Plant to eliminate these compounds and continue to provide safe and reliable drinking water supplies to the Tustin customers. The scope of work includes the following:
- Demolish the existing reverse osmosis and ion exchange (IX) treatment system
- Install four new IX vessels and a new sodium hypochlorite storage and disinfection system to treat the water from the extraction wells
- Replace the existing nitrate treatment system
- Construct a new section of distribution piping from the existing treatment plant
- Upgrade the booster pumps to accommodate increased flows
- Sewer and storm drain improvements
- Install new electrical service, motor control centers, variable frequency drives, automatic transfer switch, and instrumentation and controls
- Upgrade the City’s existing SCADA system
- Install nearly 3 miles of conveyance pipeline to transport water from four offsite wells to the new water treatment system
- Pipeline construction involves asphalt removal and replacement, striping, and traffic control