State Water Project
The California State Water Project (SWP) is a multi-purpose water storage and delivery system that includes a collection of canals, pipelines, reservoirs, and hydroelectric power facilities. It delivers clean water to 27 million Californians, 750,000 acres of farmland, and businesses throughout our state.
During an average water year, about half of the SCV’s water is imported, primarily through the State Water Project, which extends for more than 705 miles from north to south, terminating at Castaic Lake.
Water is first stored in Lake Oroville, located northeast of Sacramento. It then travels through various reservoirs, dams, power plants and rivers before reaching the Sacramento-San Joaquin Delta, a complex network of natural and man-made channels.
From the Delta, the water makes its way to the Harvey O. Banks Pumping Plant where it begins a 300 mile journey in the California Aqueduct. Then at the A.D. Edmonston Pumping Plant, the water is lifted 1,926 feet and enters more than eight miles of tunnels to cross the Tehachapi Mountains. From this point the water continues south through the West Branch of the California Aqueduct through Quail Lake, Pyramid Lake and finally into Castaic Lake.
Water is withdrawn from Castaic Lake and flows through large underground pipelines to supply the Agency’s treatment plants, the Earl Schmidt Filtration Plant and the Rio Vista Water Treatment Plant.
This water supply depends on several factors, including rainfall, snowpack, runoff, water in storage facilities, and pumping capacity from the Delta. The amount of water available for distribution is also influenced by the need to protect fish and wildlife, water quality, and environmental and legal restrictions. These factors determine how much the State Water Project is able to release to each of the contract agencies, such as SCV Water, each year. Sometimes we may get as much as 60% of our allotment, but during drought that could be 5%, or even zero.
Visit the California Department of Water Resources website to learn more about the State Water Project.
Delta conveyance refers to State Water Project (SWP) infrastructure in the vast network of waterways comprising the Sacramento-San Joaquin Delta (Delta) that collects and moves high-quality, clean, safe and affordable water to homes, farms and businesses throughout major regions of the state from the Bay Area to Southern California. The Department of Water Resources (DWR) is the owner and operator of the SWP and is responsible for all associated upgrades and maintenance, including the proposed Delta Conveyance Project that will modernize this water transport infrastructure in the Delta.
View this Story Map for more information on several key aspects of the Delta Conveyance Project.
- Your Water
- -Water Sources
- Water Cycle
- Sites Reservoir Project
- LARC Pipeline Project
- +Watershed Planning
- +Water Quality
- +Plans and Reports
- Groundwater Sustainability Agency
- +Drought Ready SCV