What Does Groundwater Have to Do with the Delta? A Lot. (Delta Stewardship Council) 07-25-19
California has a vast water supply not just in its lakes, rivers, and estuaries, but also underground. For years, California’s cities and farms have depended on this unseen resource, especially in the southern part of the state where rainfall is low, surface water is scarce, and demand is high. In fact, underground aquifers provide about 40 percent of California’s water supply in a normal year and significantly more in dry years.