Water Sources, Treatment and Delivery

Water Treatment and Delivery

We are committed to the continued investment in, and proactive maintenance of, our infrastructure, which pumps, treats and delivers nearly 5 billion gallons of quality drinking water to homes and businesses each year. The system includes 317 miles of pipeline, seven wells, two reservoirs and the Mesa Water Reliability Facility (MWRF) – “Murph” for short. Thanks to this state-of-the-art facility, we are the only Orange County water provider to source 100 percent of our community’s water needs with a local supply. The MWRF features two deep-water wells, a million-gallon reservoir and nanofiltration technology for water treatment. The MWRF helps Mesa Water achieve the Board of Director's long-time goal of 100 percent local, reliable sustainability.

Mesa Water was the first OC water purveyor to treat amber-color water. Roots from redwood trees deep underground make the water the color of weak tea. The color is removed during treatment at the Mesa Water Reliability Facility.

Water Sources

Water is pumped from Orange County’s groundwater basin, which underlies north-central Orange County from Irvine to the Los Angeles County border and from Yorba Linda to the Pacific Ocean. The basin is replenished by water from the Santa Ana River and imported water from the Metropolitan Water District of Southern California. Mesa Water is not dependent on outside sources, but imported water from Northern California and the Colorado River is accessible, if needed.