Note that it’s the average American who consumes more than 300 gallons of California water each week, not the average Californian (whose usage is way higher). This is because this mythical average American is consuming a tremendous amount of food produced in California, everything from almonds to avocados explains the New York Times:
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California farmers produce more than a third of the nation’s vegetables and two-thirds of its fruits and nuts. To do that, they use nearly 80 percent of all the water consumed in the state. It is the most stubborn part of the crisis: To fundamentally alter how much water the state uses, all Americans may have to give something up.
The portions of foods shown here are grown in California and represent what average Americans, including non-Californians, eat in a week. We made an estimate of the amount of water it takes to grow each portion to give you a sense of your contribution to the California drought.