Reclaimed Wastewater

The Federal Energy Management Program (FEMP) created a series of alternative water maps to help federal agencies strategically plan where to implement alternative water projects. Alternative water is water supplied by sustainable sources that can be used to help offset the use of fresh surface water and groundwater (such as lakes and aquifers).

Alternative water sources include:

  • Harvested rainwater
  • Captured condensate from air handling units
  • Reclaimed wastewater.

Alternative water is typically used in non-potable applications such as irrigation, cooling tower make-up, and vehicle wash.


For more information, see FEMP's Best Management Practice #14: Alternative Water Sources.


  • Rainwater Harvesting: Tool that estimates the amount of monthly rainfall that can be harvested from rooftops or other hard surfaces.