Region
California
27
Arizona
20
Colorado
17
Nevada
15
Washington (State)
15
Texas
13
Florida
12
Idaho
12
New Mexico
11
Black Mesa (Navajo County and Apache County)
9
Oregon
8
Alaska
7
United States
7
Montana
6
New York (State)
6
North Dakota
6
Kansas
5
Missouri
5
Naval Undersea Warfare Engineering Station
5
Atlantic Coast (U.S.)
4
High Plains Aquifer
4
Humboldt River Watershed
4
Illinois
4
Maryland
4
Nebraska
4
New Jersey
4
Snake River Plain (Idaho and Or.)
4
Virginia
4
Wyoming
4
Yucca Mountain
4
Floridan Aquifer
3
Georgia
3
Great Basin
3
Great Plains
3
Hawaii
3
Middle West
3
Potomac River Watershed
3
South Carolina
3
Taylor Mountains
3
Utah
3
West (U.S.)
3
Yakima River Watershed
3
Abert, Lake
2
Alabama
2
Bay Park
2
Black Mesa Region (Navajo County and Apache County)
2
California, Northern
2
California, Southern
2
Cass County
2
Choctaw County
2
more ...