The MWD consists of 26 member agencies: 14 cities, 11 municipal water districts and one county water authority. The MWD was created by the State Legislature in 1928. The City of Long Beach is one of 13 original member agencies, joining the MWD in 1931. It is currently governed by 37 Board members with each member agency having at least one representative on the Board. Representation and voting rights are based upon the assessed valuation of real property within each member agency's service area.
MWD’s Board of Directors is the second-largest policy-setting entity in California, after the State Legislature. Its Board members provide a vital collective voice for Southern California’s water needs and help influence the direction of the State’s water activities.
MWD is one of the world’s largest water agencies. From the Colorado River through MWD’s Colorado River Aqueduct system and from Northern California through facilities of the State Water Project, it imports about half of all the water used by some 18 million consumers in Southern California from Ventura to Riverside to San Diego counties. The mission of MWD, as promulgated by the Board, is to provide its service area with adequate and reliable supplies of high-quality water to meet present and future needs