Less than 3 percent of the water on Earth is fresh; much of that is unreachable in glaciers, icecaps, or deep in the earth. Depletion of these dwindling water supplies degrades the natural environment and can necessitate costly water projects. Water conservation practices, such as efficient appliances and fixtures, behavioral changes, and changes in irrigation practices, can reduce water consumption by as much as a third.1
The benefits of water conservation not only assists with protecting the water supply (especially during drought), but water conservation may delay the need for infrastructure expansion for both water and wastewater treatment and the need for additional short-term and long-term storage capacity by reducing high peak demands.
1"Water Conservation," <https://www.greenbiz.com/research/report/2002/08/02/water-conservation>, accessed on October 16, 2019.