Nation's largest ion exchange PFAS treatment now operational

Dec. 28, 2021
Located near Yorba Lina, Calif., the PFAS Treatment Plant uses an IX treatment system made of highly porous resin. The system acts like powerful magnets that adsorb and hold onto contaminants.

The Orange County Water District and the Yorba Linda Water District (YLWD) have begun operating the nation’s largest ion exchange (IX) treatment plant to remove per-and polyfluoroalkyl substances (PFAS) from local well water.

Due to their prolonged use, PFAS are being detected in water sources throughout the United States, including the Orange County Groundwater Basin, which supplies 77 percent of the water supply to 2.5 million people in north and central Orange County. Despite playing no role in releasing PFAS into the environment, water providers must find ways to remove it from their local water supplies.

YLWD, one of 19 water providers that pump water from the groundwater basin, had all 10 of its groundwater wells impacted by perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), prompting it to temporarily shut down wells and transition to purchasing 100 percent imported water sourced from the Colorado River and Northern California. These wells were among dozens of wells throughout Orange County that were removed from service in 2020 after the state of California lowered the Response Level advisories of PFOA and PFOS; two legacy PFAS compounds no longer produced in the United States.

Located at the existing YLWD headquarters in Placentia, the PFAS Treatment Plant uses an IX treatment system made of highly porous resin that acts like powerful magnets that adsorb and hold onto contaminants. It consists of 11 IX systems (22 IX Vessels), a 25 MGD booster pump station, and an upgraded onsite chlorine generation system. During treatment, contaminants such as PFAS are removed from the water before it goes into the distribution system. Construction began in March 2021 and the facility will be capable of treating up to 25 million gallons per day.

“Bringing this treatment facility online is very important for our customers” said YLWD President Phil Hawkins. “It means YLWD can safely increase its use of local groundwater, which is less expensive and more reliable than imported water.”

The YLWD facility is among 35 PFAS treatment facilities being designed and constructed in Orange County over the next two years. OCWD is funding 100 percent of design and construction costs and 50 percent of operation and maintenance costs for its water suppliers like YLWD.

“OCWD and our amazing staff are committed to proactively and swiftly addressing PFAS in the Orange County Groundwater Basin,” said OCWD President Steve Sheldon. “We worked closely with YLWD to rapidly construct this treatment facility to remove PFAS from groundwater and ensure that they continue to meet all state and federal drinking water standards. I want to commend our team on a job well done.”