Welcome to CDM Smith.

Leading the Way in Water Reuse

​Orange County Water District and Orange County Sanitation District CALIFORNIA, USA
Orange County’s groundwater replenishment system produces potable water for indirect reuse from highly treated wastewater—conserving water resources, reducing energy consumption and supporting economic vitality.

Faced with extended droughts and continued population growth, the Orange County Water District and Orange County Sanitation District embarked on the landmark groundwater replenishment system (GWRS) project—a true model of sustainability. Producing potable water for indirect reuse from highly treated wastewater, the system conserves and recovers limited water resources, reduces energy consumption and supports economic vitality.

mgd
of reclaimed water processed by GWRS
mgd
of expandable capacity
Orange County residents served by GWRS Water
Public health and safety was a top priority when CDM Smith designed the 70-million-gallon-per-day (mgd) GWRS. Therefore, water is treated with microfiltration and reverse osmosis, followed by ultraviolet light disinfection, to ensure that all bacteria, emerging contaminants and viruses are removed. The treated water is then injected into an underground seawater barrier or percolated into aquifers, providing a new water source for about 500,000 people living in the area.
Project Details

Treatment Innovation for Safe Water Supplies
Three barriers ensure that GWRS produces safe water: micro­fil­tra­tion, reverse osmosis, and ultraviolet light disin­fec­tion.

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