Food
- Water Footprint Network, Product Gallery
- United Nations Educational, Scientific and Cultural Organization–International Hydrological Programme (UNESCO–IHP). “Water footprints of nations, Volume 1 : Main Report”, Value of Water Research Series No. 16 (2004)
- Food and Agriculture Organization of the United Nations (FAOSTAT), 2003 Food Balance Sheets
Energy
- U.S. Energy Information Administration (EIA)
- U.S. Geological Survey (USGS), Estimated Use of Water in the United States in 2000
Indoor
- U.S. Environmental Protection Agency (EPA), EnergyStar program
- EPA, WaterSense program
- Aquacraft, Inc. and American Water Works Association Research Foundation, Residential Water Use Summary
Outdoor
- University of Illinois Extension “Tips for Water Conservation”
- Texas A&M AgriLife Extension, “Efficient Use of Water in the Garden and Landscape, Lawns”






