Region
Colorado
10
California
9
Louisiana
9
New Mexico
8
Florida
7
Rhode Island
5
Ohio
4
Tennessee
4
Texas
4
Albuquerque
3
Nevada
3
United States
3
Utah
3
Washington (State)
3
Wyoming
3
Arkansas
2
Big Horn County
2
Connecticut
2
Flathead Indian Reservation
2
Floridan Aquifer
2
Great Basin
2
Iowa
2
Kansas
2
Kern County
2
Lander County
2
Los Angeles County
2
Menominee Indian Reservation
2
Merced County
2
Miami River Valley
2
Montana
2
Nevada County
2
New York (State)
2
Nye County
2
Ohio River Watershed
2
Pennsylvania
2
Pittsburgh
2
Rio Grande Valley (Colo.-Mexico and Tex.)
2
San Diego County
2
Simsbury Region
2
Snohomish County
2
South Dakota
2
Southern States
2
Spink County
2
Volusia County
2
West (U.S.)
2
Wisconsin
2
Acadia Parish
1
Afghanistan
1
Albuquerque Region
1
Arizona
1
more ...