Region
California
3
Arkansas
2
Bernalillo County
2
Colorado
2
Floridan Aquifer
2
Middle West
2
Minnesota
2
Nevada
2
New Mexico
2
Tennessee
2
Accomack County (Va.)
1
Arnold Air Force Base
1
Baltic Sea
1
Big Lost River Watershed
1
Brookhaven
1
Buffalo County
1
California, Southern
1
Canon City Region
1
Cape May County
1
Deschutes River Watershed
1
Eastern Shore (Md. and Va.)
1
Florida
1
Great Basin
1
Hall County
1
Hendry County
1
Idaho
1
Illinois
1
Indiana
1
Kansas
1
Kentucky
1
Lassen County
1
Lee County
1
Logan County
1
Louisville
1
Massachusetts
1
McHenry County
1
Memphis Region
1
Milford Region
1
Montana
1
Nebraska
1
New Jersey
1
New York (State)
1
Northampton County (Va.)
1
Ohio
1
Oregon
1
Penitencia Creek Watershed
1
Powder River Basin (Wyo. and Mont.)
1
Rock River Region (Wis. and Ill.)
1
San Bernardino County
1
San Juan Basin (N.M. and Colo.)
1
more ...