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- Geological Survey (U.S.)4,431
- National Water-Quality Assessment Program (U.S.)232
- United States. Environmental Protection Agency137
- United States. Department of Energy116
- United States. Bureau of Reclamation106
- United States. Bureau of Land Management83
- United States. National Park Service71
- United States. Army. Corps of Engineers62
- Southwest Florida Water Management District (Fla.)58
- South Florida Water Management District (Fla.)46
- Arkansas Soil and Water Conservation Commission45
- United States. Bureau of Indian Affairs45
- Washington (State). Department of Ecology45
- New Jersey. Department of Environmental Protection44
- U.S. Fish and Wildlife Service40
- New York (State). Department of Environmental Conservation37
- United States. Department of Energy. Nevada Operations Office35
- Florida. Department of Environmental Regulation34
- United States. Federal Highway Administration32
- Arkansas Geological Commission28