UWM Plan - Municipal Water District of Orange County

3. Water Sources and Supply Reliability
3.1. Overview
Water supplies in MWDOC’s service area come from both local and imported sources. As
a member agency of Metropolitan, MWDOC purchases water from Metropolitan to
deliver to its member agencies to supplement local supplies. In 2010, MWDOC supplied
220,132 AFY of imported water to its member agencies. Imported water represents
approximately 45 percent of the total water supply in the MWDOC service area. Sources
of Metropolitan’s imported water include the Colorado River Aqueduct (CRA) and the
State Water Project (SWP).
Local supplies developed by individual member agencies, primarily groundwater,
presently account for about 55 percent of the service area’s water supplies. Local supplies
include groundwater, recycled wastewater, and surface water. The primary groundwater
basin is located in the northern half of MWDOC’s service area.
Figure 3-1 depicts Orange County’s current water supply sources.
Municipal Water District of Orange County
2010 Urban Water Management Plan
Final
3-1