Alfalfa over water?

I haven't had a chance to verify this but a friend told me today that some large proportion of agriculture water use in CA goes to alfalfa farming. Doesn't seem like a good use of water since alfalfa can be grown in a lot of states. Seems like our restrictions on agricultural water use in CA should discourage farming things that can be grown elsewhere just as easily.

I wondered when the last time I ate alfalfa was (and couldn't remember), and my friend told me it goes into cattle feed. So we're using water that we need to live to feed cattle that we don't need. Another good reason to get off the meat.