Region
Arizona
14
Florida
12
New York (State)
9
California
8
High Plains Aquifer
8
New Mexico
7
Oswego County
7
Floridan Aquifer
6
Tennessee
6
Kansas
5
Louisiana
5
Mississippi
5
Maricopa County
4
Montana
4
Navajo County
4
North Carolina
4
Oklahoma
4
Washington (State)
4
Coconino County
3
Hawaii
3
Nevada
3
South Carolina
3
South Dakota
3
Yuma County
3
Aberdeen Proving Ground
2
Albuquerque Basin
2
American Samoa
2
Apache County
2
Arkansas
2
Bernalillo County
2
Black Hills Region (S.D. and Wyo.)
2
Colorado
2
Duval County
2
Gila River Watershed (N.M. and Ariz.)
2
Madison Aquifer
2
Maryland
2
Massachusetts
2
Maui
2
Micronesia (Federated States)
2
New Hampshire
2
Pima County
2
Pinellas County
2
Sacramento Valley
2
San Bernardino County
2
Sarasota County
2
Tutuila Island
2
United States
2
Wisconsin
2
Aberdeen Region
1
Alabama
1
more ...