Region
Kentucky
23
Idaho
21
Minnesota
18
Teton Dam (Idaho)
17
Kansas
14
Missouri
13
Black Hills (S.D. and Wyo.)
12
Colorado
11
San Juan Basin (N.M. and Colo.)
10
Snake River (Wyo.-Wash.)
10
Illinois
9
Massachusetts
9
Ozark Mountains Region
9
Wyoming
9
Arizona
8
California
6
Montana
6
Texas
6
Great Basin
5
South Dakota
5
Southwest, New
5
United States
5
Great Plains
4
Middle West
4
Nevada
4
New Mexico
4
Snake River Plain (Idaho and Or.)
4
Teton River
4
Utah
4
West (U.S.)
4
Colorado River Watershed (Colo.-Mexico)
3
Cook County
3
Iowa
3
Lake County
3
Maine
3
Michigan
3
Mississippi River
3
Oklahoma
3
Puerto Rico
3
Wisconsin
3
Adams County
2
Alaska
2
Denver Basin
2
Denver Region
2
East Saint Louis Region
2
Hawaii
2
High Plains Aquifer
2
Indiana
2
Kansas City Region
2
Madison Aquifer
2
more ...