The layer shows the boundaries of California's State Water Districts.
"California’s interconnected water system serves over 30 million people and irrigates over 5,680,000 acres (2,300,000 ha) of farmland. As the world’s largest, most productive, and most controversial water system, [Hundley, N. (2001). The great thirst: Californians and water. Berkeley, Calif.: University of California Press.] it manages over 40,000,000 acre feet (49 km3) of water per year.[Jenkins, Marion W.; Lund, Jay R.; Howitt, Richard E.; Draper, Andrew J.; Msangi, Siwa M.; Tanaka, Stacy K.; Ritzema, Randall S.; Marques, Guilherme F. (2004). "Optimization of California’s Water Supply System: Results and Insights". Journal of Water Resources Planning & Management 130 (4). pp. 271–280.]
Water and water rights are among the state's divisive political issues. Lacking reliable dry season rainfall, water is limited in the most populous U.S. state. An ongoing debate is whether the state should increase the redistribution of water to its large agricultural and urban sectors, or increase conservation and preserve the natural ecosystems of the water sources."  (http://en.wikipedia.org/wiki/Water_in_California. Accessed 1/23/14)

The Metropolitan Water District of Southern California is the largest supplier of treated water in the U.S..
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