Just have to wait for the "big one" when California slides off into the Pacific and there will be plenty of waterfront in Arizona. (sorry couldn't resist).
As others have mentioned, look at the rivers and reservoirs.
We've been thru Arizona a few times and after a week or two, the brown gets on my nerves. It won't stop us from visiting for short periods but for longer periods, we found the Texas coast better. Lots of water, lots of green and still mostly dry. To a large degree, the further inland you move, the dryer it gets.