Water Supplies

Southern California imports nearly half of its drinking water supplies to satisfy the water needs of our communities. Locally, the southeast Los Angeles County relies on imported water supplies, local groundwater supplies, and recycled water. Central Basin plays a key role in delivering both imported and recycled water supplies. 

One of the main goals of the District is to partner with retailer water agencies to provide regional water reliability by conducting regional planning to ensure water demands and supplies are balanced; representing the region’s water interests; increasing recycled water; and expanding water conservation.

For the latest information on Central Basin’s water supply initiatives, we encourage you to attend the Water Resources Committee. For information on Water Rates, visit our Finance Page.

Imported Water

The Metropolitan Water District of Southern California (MWD) is responsible importing water from the Sacramento and San Joaquin Rivers through the State Water Project and from the Colorado River via the Colorado River Aqueduct. Imported water is a supplemental resource to groundwater.

Southern California receives about 30% of its water from the State Water Project and relies heavily on the Colorado River Aqueduct. For over 70 years, the aqueduct has been supplying the region with a major source of supplemental water.

As an MWD Member Agency, Central Basin delivers imported water from the State Water Project and the Colorado River Aqueduct to its service area.  


In 1952, Central Basin was formed to provide the Southeast Los Angeles region with a supplemental source of water.  During that time, the cities of this region relied heavily on groundwater. This source of water is located beneath the earth’s surface and requires users to pump the water out. Central Basin’s role today is to continue providing a supplemental source to groundwater.

Recycled Water

Central Basin has recognized that the increasing demands for water, limitations on water supplies and the threat of cyclical droughts calls for additional reliable sources of water.  In response, Central Basin developed a regional water recycling program. Recycled Water is wastewater that has been treated to be used for non-drinking purposes, such as irrigation.

Recycled water is becoming more increasingly popular as it plays a key role in water reliability.  For more information on the Central Basin’s Recycled Water Program and its benefits, please click here.

Central Basin Water Purveyors:

Central Basin services 40 water retailers, including cities, water districts, special districts and one water wholesaler. Please click here to learn more about our customers. 

Planning and Managing our Water Supplies:

Central Basin secures water reliability for 1.7 million people from 40 local water providers. Please visit our page to find out how we manage and plan for the future.