Design-build expansion of production capacities of the Barrier Water and the Title 22 treatment processes at an existing water recycling plant.  This expansion increases the amount of recycled water being injected into the Barrier from 7.5 million gallons per day (mgd) to 12.5 mgd.  It also includes upgrade of the barrier process to eliminate an old lime pretreatment system by replacement with additional reverse osmosis and microfiltration, and installation of a new ultra violet treatment system.

According to West Basin Municipal Water District, the WBWRF is one of the largest facilities of its type in the country, and is the only treatment facility in the country to provide five qualities of custom-made recycled water for various municipal, commercial and industrial applications.  It provides nearly eight billion gallons of recycled water annually to over 200 sites in the Southern California region.

In 2005, this Phase IV expansion project won Project of the Year award in the Large Project category from the WateReuse Association.  In 2006, the project was featured in a presentation at the Design-Build Institute of America’s national Water/Wastewater Convention.

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