I think you're exaggerating a little bit, but meat is a huge culprit that people don't talk about much. The meat and dairy industries make up 47% of California's water usage, while other agriculture uses 46%. A large part of the reason is that there is enormous energy loss in the growing-an-animal part of the food chain — every serving of an animal product comes from many servings of plant products given to the animal.

Source: http://www.waterfootprint.org/Reports/Fulton%20et%20al%20201...