Region
Colorado
8
San Juan Basin (N.M. and Colo.)
8
Kansas
7
Florida
6
Louisiana
6
Montana
6
Nevada
6
Washington (State)
6
Yakima River Watershed
6
Yakima River Watershed (Wash.)
6
Arizona
5
New York (State)
5
Texas
4
Utah
4
Great Basin
3
Humboldt River Watershed
3
Kittitas County
3
Kittitas County (Wash.)
3
Minnesota
3
Missouri
3
Morrison Formation
3
Ozark Mountains Region
3
Wyoming
3
Adams County
2
Alamosa River (Colo.)
2
American Samoa
2
Bay County
2
Black Hills (S.D. and Wyo.)
2
Cattaraugus County
2
Columbia Plateau
2
Conejos County
2
Dugway Proving Ground Region
2
Five-O, Lake, Region
2
Fort Worth Region
2
Gallatin River Watershed (Wyo. and Mont.)
2
High Plains Aquifer
2
Hillsborough County
2
Indiana
2
Jefferson County
2
Kentucky
2
Maricopa County
2
Massachusetts
2
Naval Ordnance Station Louisville (Ky.)
2
New Hampshire
2
New Jersey
2
Northern Mariana Islands
2
Pemigewasset River Watershed
2
Rancocas Creek Watershed
2
Saipan
2
Salt River Valley (Gila County and Maricopa County)
2
more ...