Agriculture uses around 80% if you don't count environmental water usage, yes.
Those people need to eat, but it's not like 100% of the food grown in California is eaten in California, nor does California grow 100% of the food it consumes. California's growers are driven by the national food market, not the state food market.
Those people need to eat, but it's not like 100% of the food grown in California is eaten in California, nor does California grow 100% of the food it consumes. California's growers are driven by the national food market, not the state food market.