The American West, including the cities of Las Vegas, Nevada; Los Angeles, California; Phoenix, Arizona; and Denver, Colorado, falling under the reaches of the greater Colorado River Basin (CRB), is now among the world's water stressed regions facing the environmental, economic, and social challenges of increased water scarcity. The CRB supplies more than 1 in 10 Americans with some, if not all, of their water for municipal use, including drinking water.