Region
California
44
United States
38
Nevada
30
Idaho
22
Colorado
20
North Carolina
15
Florida
14
Wisconsin
12
Texas
11
West Virginia
10
Illinois
9
Oregon
9
South Dakota
9
Utah
9
Washington (State)
9
Wyoming
9
Alaska
8
Arizona
8
Minnesota
8
New Jersey
8
Ohio
8
Pennsylvania
8
Tennessee
8
Kentucky
7
Louisiana
7
Mississippi
7
Montana
7
New Mexico
7
San Bernardino County
7
Georgia
6
Iowa
6
Maryland
6
Massachusetts
6
San Francisco Bay
6
Yakima River Watershed
6
Alabama
5
New York (State)
5
Ohio River Watershed
5
Snake River Plain (Idaho and Or.)
5
Belvidere
4
Clark Fork Watershed (Mont. and Idaho)
4
Connecticut
4
Idaho National Laboratory Region
4
Indiana
4
Kansas
4
Missouri
4
Nebraska
4
Oklahoma
4
Puerto Rico
4
Shasta River Watershed
4
more ...