The San Gabriel Valley is a distinct watershed shaped by local mountains, rivers, streams and other geological formations. A major, natural source of water for the Valley is the San Gabriel River and streams, ponds, lakes, dams and reservoirs connected to it that are located either in the San Gabriel Mountains or the Valley, itself. Beneath the Valley is the Main San Gabriel Basin, the focal point of our Valley’s water supply system.
Your water basin is bit more than 100 yards below the ground, right underneath your feet, and it is situated throughout the Valley. Just imagine the length of a soccer or football field, but downward, deep underground. That’s where the vast majority of your water comes from. It is held in a natural holding area formed of bedrock called a water basin. This underground basin holds rainfall, snowmelt and conserved water.
By far the largest component of local water supplies is groundwater pumping, providing about 80% of the water we use. 20% of the water we use is imported water from northern California by the State Water Project and from the Colorado River.
For more information on the Valley’s water supply, please refer to Watermaster’s educational website, “The Waters That Connect Us” (https://www.thewatersthatconnectus.com/copy-of-the-basics).
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