Some statistics about Arizona's water sources and where it goes. 72% of the water is used by agriculture. 6% to industry 22% to municipal use

http://www.arizonawaterfacts.com/water-your-facts

But yes, water usage is a big issue in AZ at the moment with Lake Mead and Powell at very low levels which has triggered and will trigger more cuts to the use of Colorado River water via the Central Arizona Project canal.

Arizona has no law even measuring, much less restricting groundwater pumping which is a big problem getting bigger as cuts in Colorado River usage lead to more pumping.