Water from northern California is acquired through the State Water Project and transported to the San Gabriel Valley via the California Aqueduct. We obtain out-of-state water from the Colorado River to supplement our local water supply.
State Water Project
The State Water Project obtains its supplies primarily from the Sacramento River Basin. About half of the total supply diverted from the Delta for the State Water Project is regulated flow from the Feather River (a tributary to the Sacramento River ), while the other half is unregulated flow from runoff downstream of Sacramento River reservoirs and from other rivers that flow into the Delta. The Sacramento River watershed is subject to wide annual variations in total runoff.
The distribution and management of Colorado River water is governed by a complex body of laws, court decrees, compacts, agreements, regulations, and an international treaty collectively known as the "Law of the River."