Water levels in the Colorado River are declining, raising concern in Arizona and other western states about the outlook for future water supplies. But water experts like Paul Westerhoff, a professor in the School of Environmental Engineering and the Built Environment, part of the Fulton Schools, say there are water-use strategies that can help ensure lower river water levels won’t always have severe consequences. The key is using various qualities of water from various sources for different applications, Westerhoff says. Untreated wastewater, for example, can be used for some purposes without being purified, while advances in atmospheric water capture could provide high-quality water suitable for many uses.