About Irvine Ranch Water District
IRWD provides high-quality drinking water, reliable sewage collection and treatment, drought-proof recycled water, and natural urban runoff treatment for central Orange County. IRWD serves all of Irvine , most of Lake Forest , and parts of Newport Beach , Tustin , Costa Mesa , Orange and unincorporated Orange County .
Orange
Unincorporated Orange County
Tustin
Costa Mesa
Irvine Ranch Water District
Lake Forest
Irvine
Newport Beach
Newport Coast
181 square miles (nearly 20% of Orange County)
450,000 residential population served
640,000 daytime population served
IRWD water treatment facilities IRWD is Orange County's largest retail water district. Below are just a few of our major facilities used in the delivery and treatment of drinking water. Learn more about all IRWD facilities at IRWD.com/facilities .
Baker Water Treatment Plant The Baker Water Treatment Plant in Lake Forest provides 28.1 million gallons of reliable, high-quality drinking water per day — enough to serve more than 60,000 homes.
Deep Aquifer Treatment System The Deep Aquifer Treatment System purifies drinking water from the Orange County Groundwater Basin and produces 8 million gallons of drinking water each day.
Irvine Desalter Plant The Irvine Desalter Project consists of five wells in Irvine. Water from the wells is sent to the IDP treatment facility, which provides 1.6 billion gallons of drinking water per year.
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IRWD Water Quality Report 2026
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