GWRS – new water you can count on
The GWRS is the world’s largest water purification system for indirect potable reuse. The system takes highly treated wastewater that would have previously been discharged into the Pacific Ocean and purifies it using a three-step advanced treatment process consisting of microfiltration, reverse osmosis and ultraviolet light with hydrogen peroxide. The process produces high-quality water that meets or exceeds all state and federal drinking water standards.
View the GWRS technical brochure (PDF)
The process
After wastewater is treated at the Orange County Sanitation District, it flows to the GWRS where it undergoes a state-of-the-art purification process.
Frequently asked questions
You have questions? We have answers. Explore some of the GWRS’ most frequently asked questions.
Final expansion
The GWRS Final Expansion project will increase treatment capacity from 100 to 130 million gallons per day; enough water for 1 million people!
