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The Municipal Water District of Orange County is a wholesale water supplier and resource planning agency that serves all of Orange County (except Anaheim, Fullerton, and Santa Ana) through 28 retail water agencies. We purchase imported water from the Metropolitan Water District of Southern California and distribute it to our client agencies, which provide retail water services to the public.

Water is one of Southern California’s most precious resources, and there's a critical need to coordinate water resource management and planning among the many agencies providing water to our region.

The Metropolitan Water District of Southern California (MET) manages and coordinates the delivery of imported water supplies from the Colorado River and Northern California through the State Water Project within six Southern California counties – Ventura, Los Angeles, Orange, Riverside, San Bernardino and San Diego.

Representing all of Orange County - with the exception of the cities of Santa Ana, Anaheim, and Fullerton - is the Municipal Water District of Orange County (MWDOC). MWDOC works with Orange County’s 28 client agencies to ensure local residents and businesses receive the reliable supply of high quality imported water they need. MWDOC also works with other Metropolitan agencies to help determine our future water needs and ensure reliable supplies.
The State Water Project delivers water from the Sacramento-San Joaquin Bay
Delta in northern California to more than 18 million southern Californians.
Approximately 50 percent of the water used throughout Orange County comes from imported supplies. This imported water comes from Northern California (through the State Water Project) and the Colorado River.  The remainder of Orange County’s water supply comes from a vast underground aquifer located below north and central Orange County, as well as from recycled wastewater produced by several local water agencies, and several small groundwater basins. Click here to access the OC water supply sources handout.

The large groundwater basin that underlies the northern half of Orange County provides about 75 percent of that area’s needs. South Orange County is virtually 100 percent dependent on imported water. The Orange County Water District, also headquartered in Fountain Valley, manages the groundwater basin, while MWDOC manages our imported water supply. The two agencies work cooperatively and are continually evaluating new and innovative programs, including seawater desalination, wetlands expansion, recharge facility construction, surface storage, new water use efficiency programs, and system interconnections for enhanced reliability.
A "pipemobile" moves a segment of pipe into position
during contruction of a new water transmission line.

While water remains one of the most cost-efficient utilities in California, the cost of wholesale water is rising across the state. In addition to meeting the challenges of providing high-quality water, MWDOC and other agencies also must deal with significant issues that will affect water rates in the future, including:

·         Water security investments

·         Increasingly stringent water quality requirements

·         Increased cost for imported water supplies

·         Aging water facilities and infrastructure

·         Competition for supplies among agricultural, urban and environmental

·         Population growth and increasing demands

MWDOC will continue working with its member agencies to meet these challenges and ensure a supply of reliable water for Orange County.