Region
California
4
Utah
4
New Mexico
3
Arizona
2
Colorado
2
Florida
2
Nevada
2
Texas
2
Alexander Valley
1
American Samoa
1
Brazos River Valley
1
Cannon Air Force Base
1
Cape May County
1
Cedar Valley (Iron County)
1
Cedar Valley (Utah County)
1
Centereach
1
Centereach (N.Y.)
1
Columbia Plateau
1
Cypress Creek
1
Denver Basin
1
Grand County
1
Handcart Gulch
1
High Plains Aquifer
1
Humboldt River Watershed
1
Idaho
1
Illinois
1
Kern County
1
Lake Tahoe Basin National Forest (Calif. and Nev.)
1
Leupp
1
Marina
1
Massachusetts
1
Melrose Air Force Range (N.M.)
1
Mohave County
1
Morgan County
1
New Jersey
1
New York (State)
1
North Carolina
1
Otero County
1
Pajaro River Valley
1
Pecos County Region
1
Polk County
1
Powder River Basin (Wyo. and Mont.)
1
San Juan County
1
Shoalwater Bay Indian Reservation
1
Tau
1
Tulare County
1
Virginia
1
Warren County
1
Washington (State)
1
West Virginia
1
more ...