You do realize that agriculture uses 80% of the (mostly free) developed and deliverable water, while urban cities use about 10%?

That's true of basically all of the West and the Colorado River, too.

Sure do! But people die in a few days without potable water, crops are usually more drought resistant.

And yes, I do get the point that if you suggested we build $6B desalination plants to grow lettuce people would balk and say, "That's not worth the money!". We should use less water on crops.