Region
United States
81
Alaska
6
West (U.S.)
6
Northeastern States
4
California
3
Colorado
3
Colorado River Watershed (Colo.-Mexico)
3
Northwest, Pacific
3
Utah
3
Wyoming
3
Colorado River (Colo.-Mexico)
2
Florida
2
Georgia
2
Guatemala
2
Africa South of the Sahara
1
Africa, Sub-Saharan
1
Arizona
1
British Columbia
1
China
1
East (U.S.)
1
Europe, Eastern
1
European Union countries
1
Four Corners Region
1
Gakona
1
Germany
1
Great Plains
1
Gujarat
1
India
1
Iowa
1
Lincoln
1
Miami Region
1
Missouri River
1
Nebraska
1
Nevada
1
New Mexico
1
Russia
1
Sacramento Municipal Utility District (Calif.)
1
Southwestern States
1
Sri Lanka
1
Texas
1
United States Virgin Islands
1
Vancouver Island
1
Washington (D.C.)
1