<P> 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, it manages over 40,000,000 acre feet (49 km) of water per year . </P> <P> Water and water rights are among the state's divisive political issues . Due to the lack of 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 . </P>

Where does drinking water come from in california