Region
California
135
Nevada
85
Colorado
66
Florida
66
Alaska
59
Arizona
58
Powder River Basin (Wyo. and Mont.)
41
Mohave County
38
Montana
36
Utah
35
New Mexico
34
Washington (State)
31
United States
24
Wisconsin
23
San Bernardino County
22
Idaho
20
Lincoln County
20
Virginia
19
Oregon
18
Maryland, Southern
15
Texas
14
Wyoming
14
Minnesota
13
California, Southern
12
Riverside County
11
San Juan County
11
Clark County
10
Hawaii
10
McCone County
10
Missouri
10
Palm Beach County
10
Saudi Arabia
10
Vermont
10
Maryland
9
New Hampshire
9
North Carolina
9
San Juan County (N.M.)
9
Black Hills (S.D. and Wyo.)
8
Kansas
8
Patapsco Aquifer
8
Pennsylvania
8
Dawson County
7
Denver Basin
7
Iron County
7
Magothy Aquifer
7
Nye County
7
Oklahoma
7
Prairie County
7
Tennessee
7
Yavapai County
7
more ...