Region
Florida
68
Nevada
38
Texas
32
California
26
New Mexico
19
United States
16
Arkansas
15
Maryland, Southern
15
Arizona
13
Michigan
12
Colorado
11
Hawaii
11
Tennessee
10
Georgia
9
Kansas
9
Maryland
9
Oregon
9
Palm Beach County
9
Utah
9
Idaho
8
Patapsco Aquifer
8
Wyoming
8
Alabama
7
Floridan Aquifer
7
Magothy Aquifer
7
Pennsylvania
7
Washington (State)
7
Mississippi
6
New Jersey
6
Snake River Plain (Idaho and Or.)
6
Virginia
6
Yucca Mountain Region
6
Alaska
5
Black Mesa (Navajo County and Apache County)
5
Houston Region
5
North Carolina
5
Nye County
5
Puerto Rico
5
Saint Petersburg Region
5
South Carolina
5
South Dakota
5
Albuquerque Basin
4
Aquia Formation
4
Douglas County
4
Fort Bend County
4
High Plains (U.S.)
4
Miami-Dade County
4
New York (State)
4
Oahu
4
San Antonio Region
4
more ...