Region
Florida
6
North Carolina
6
Nevada
4
Tennessee
4
Washington (State)
4
Colorado
3
Floridan Aquifer
3
Hawaii
3
Louisiana
3
New Hampshire
3
New Mexico
3
United States
3
American Samoa
2
Arnold Air Force Base
2
California
2
Catron County
2
Cocheco River Watershed
2
Illinois
2
Jones County
2
Marine Corps Air Station Cherry Point
2
Massachusetts
2
Minnesota
2
Nebraska
2
New York (State)
2
Onslow County
2
Orange County
2
Oregon
2
Osceola County
2
San Juan Basin (N.M. and Colo.)
2
Skamania County
2
South Dakota
2
Tutuila Island
2
Utah
2
White Clay Creek Watershed (Pa. and Del.)
2
Aberdeen Region
1
Alabama
1
Antioch Region
1
Appalachian Region
1
Arizona
1
Baton Rouge Region
1
Baton Rouge Region (La.)
1
Bear Valley (San Bernardino County)
1
Berkshire Hills Region
1
Buffalo County
1
Cabo Rojo
1
Caddo Nation of Oklahoma
1
Calumet Region (Ill. and Ind.)
1
Carroll Valley
1
Charleston
1
Chesapeake Bay Region (Md. and Va.)
1
more ...