Southern Nevada uses a tiny amount of water compared to most states, about 2% of the total that’s apportioned from the CO river, and recycles about 40% of it. For indoor usage, 99% of water is recycled.

I agree growing things in the desert may be inefficient, but speaking for the CO river, that problem is in California and Arizona.

https://www.snwa.com/water-resources/where-water-comes-from/...

https://lvgea.org/water/