That's true DD. Vegas area uses reuse water which is minimally treated sanitary sewer water for park and golf course irrigation. The rest of the sewage is fully treated to drinking water quality and returned to the lake. We get credit for what is returned to Lake Mead and it doesn't count against our Colorado River allotment.
The Vegas Valley uses less water today than was used in 2002 with about 780,000 more people here now.
