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- Geological Survey (U.S.)738
- National Water-Quality Assessment Program (U.S.)84
- United States. Environmental Protection Agency27
- United States. National Park Service24
- United States. Bureau of Reclamation14
- Pennsylvania. Department of Environmental Protection11
- Wisconsin. Department of Natural Resources11
- Arkansas Soil and Water Conservation Commission10
- Massachusetts. Department of Environmental Protection10
- United States. Bureau of Indian Affairs10
- United States. Department of Energy10
- United States. Forest Service10
- Connecticut. Department of Environmental Protection9
- New Jersey. Department of Environmental Protection9
- South Florida Water Management District (Fla.)9
- Green, W. Reed8
- United States. Army. Corps of Engineers8
- United States. Naval Facilities Engineering Command. Southern Division8
- Air Force Center for Environmental Excellence (U.S.)7
- Heywood, Charles E.7