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- Antioch opens a brackish water desalination facility.
- The plant will supply up to 40 percent of the city’s water.
- It is the first desalination facility in the California Delta.
Friday, September 26, 2025 — Last week, the City of Antioch marked a significant step toward water security with the opening of its new brackish water desalination facility. Supported by $10 million in Proposition 1 desalination grant funding from the California Department of Water Resources and a $60 million low-interest loan from the California Water Boards’ Drinking Water State Revolving Fund, the project will provide up to 6 million gallons of treated drinking water per day.
The facility is located near Antioch’s existing treatment plant and is designed to safeguard local supplies from rising salinity in the San Joaquin River. The city, home to about 112,000 residents, now has a new buffer against the risks of drought and reduced freshwater flows.
How the Facility Works
The
uses reverse osmosis technology to remove salt from water. This process creates a reliable local source of high-quality drinking water and reduces dependence on imported water and groundwater. Unlike seawater desalination, brackish desalination is less energy-intensive and more cost-effective, making it a practical option for inland communities…