Alternative Water Source

Alternative water sources are those that draw water from processes or applications other than freshwater sources like surface or groundwater. Examples of alternative water sources include greywater, reclaimed wastewater, stormwater, rainwater, air handling unit condensate, process equipment discharge water, and drainage or sump water. Depending on their filtration and treatment requirements, alternative water sources can be used for various purposes, such as laundry services, landscape irrigation, toilet flushing, cooling tower makeup water, fire sprinkler systems, and decorative water features. By replacing potable water with alternative water sources, buildings can reduce stress on freshwater sources and make progress toward achieving Net Zero Water goals.

DOE FEMP | Best Management Practices - Alternative Water Sources

EPA | WaterSense at Work - Onsite Alternative Water Sources