Region
United States
60
California
36
Colorado
23
Texas
19
Florida
18
Alaska
14
Wisconsin
14
New York (State)
12
Kansas
11
New Jersey
11
Louisiana
10
Michigan
8
Oregon
8
Arkansas
7
Nevada
7
New Mexico
7
Pennsylvania
7
Arizona
6
Chesapeake Bay Watershed
6
Delaware River Watershed (N.Y.-Del. and N.J.)
6
Idaho
6
Minnesota
6
Chesapeake Bay (Md. and Va.)
5
Clark Fork Watershed (Mont. and Idaho)
5
High Plains Aquifer
5
Ohio
5
Utah
5
Wyoming
5
Yukon River Watershed (Yukon and Alaska)
5
Illinois
4
Johnson County
4
Montana
4
Nebraska
4
South Dakota
4
Virginia
4
Alabama
3
Coeur d'Alene River Watershed
3
Delaware
3
Georgia
3
Grand Portage Reservation
3
Hawaii
3
Houston, Lake
3
Indiana
3
Iowa
3
Los Angeles County
3
Lower Columbia River (Or. and Wash.)
3
Maryland
3
Middle West
3
Mississippi River
3
Missouri
3
more ...