Region
United States
168
California
138
Texas
122
Colorado
100
Idaho
96
Washington (State)
95
New York (State)
92
Oregon
76
Florida
75
Massachusetts
68
Arizona
65
Kansas
63
Arkansas
58
Nevada
57
Hawaii
54
Missouri
54
New Mexico
53
Ohio
53
Wisconsin
52
Indiana
51
Oklahoma
49
New Jersey
46
Alaska
45
Pennsylvania
45
Minnesota
43
Georgia
42
Nebraska
37
Michigan
36
Montana
36
South Dakota
34
North Carolina
33
Virginia
33
Illinois
32
Utah
32
Maine
31
North Dakota
31
Wyoming
29
South Carolina
24
Maryland
23
Connecticut
20
Louisiana
20
New Hampshire
19
Alabama
18
Iowa
18
Rhode Island
18
Snake River Plain Aquifer
18
Vermont
17
Yakima River Watershed
17
Colorado River (Colo.-Mexico)
16
Edwards Aquifer (Tex.)
16
more ...