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.


Rainwater Harvesting Regulations Map
Provides information on how rainwater is regulatedĀ in each state, as well as regulatory and technical information where applicable.
Learn more
Rainwater Availability Map
Provides zip-code-level monthly precipitation data to help federal agencies strategically prioritize commercial rainwater harvesting projects.
Learn more
Rainwater Availability for Landscape Irrigation Map
Provides zip-code-level data to help federal agencies identify locations well suited to supplement irrigation with harvested rainwater.
Learn more
Condensate Capture Potential Map
Provides data on the potential for condensate capture from air-conditioning systems across the United States.
Learn more
Reclaimed Wastewater Map
Map shows water utilities that sell reclaimed wastewater, which has potential for reuse in applications such as irrigation and industrial processes.
Learn more