Pete,
In Az there are restrictions on turfed acreage and water use...but Indian courses are not subject to the restrictions. We-Ko-Pa, Apache, and Talking Stick don't have to follow the law...but they may, I don't know.
Vegas has also implemented an irrigation program, but I don't know the details.
In the Coachella Valley, as far as I know, there are no mandatory restrictions on water use or turfed acreage. But, I do know the aquifer is shrinking at an alarming rate and I've heard there is subsidence, but I have no particulars. I do know it is a very large aquifer and I also know that a lot of Colorado River water is channeled into the valley. But, I'm guessing there are a lot more farmed acres in Riverside and Imperial Counties using river water then golf acres. I also seem to remember that the Mexicans are very unhappy with us since the Colorado is basically a trickle when it reaches them.