Living in Southern Nevada since the late 60's, in a population of then 150,000 or less, I remember having to implement water saving measures. No watering the grass, no washing your car, and on and on. Several times in fact through the 70's as well with we have no water mantra. Now we're in a time of about 3 million in the Vegas Valley...and there seems to be plenty of water.
Just sayin.