Region
United States
46
Washington (State)
12
Aberdeen Proving Ground
7
Maryland
7
Massachusetts
7
Naval Undersea Warfare Engineering Station
7
California
6
New Jersey
6
Ashland
3
Colorado
3
Pennsylvania
3
Bucks County
2
Fort Gordon
2
Fort Lewis
2
Georgia
2
Kentucky
2
Long Island
2
Los Angeles
2
Los Angeles Region
2
Louisville
2
Mississippi River Watershed
2
New York (State)
2
Ohio River
2
Palouse River Watershed (Idaho and Wash.)
2
Tennessee
2
Arnold Air Force Base Region
1
California, Southern
1
Canal Creek
1
Connecticut
1
Davisville Region
1
Deer Creek (Butler County and Allegheny County)
1
Delaware
1
Dover Air Force Base
1
Durham (Town)
1
Fresno
1
Great Salt Lake Watershed
1
Holbrook
1
Hudson River Watershed
1
Illinois River Watershed
1
Keyport
1
Kirkwood-Cohansey Aquifer (N.J.)
1
Michigan
1
Middle Atlantic States
1
Milford Region
1
Modesto
1
Mojave Desert
1
Naval Air Station Whidbey Island
1
New England
1
New Hampshire
1
Northeastern States
1
more ...