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Region
- Montana7
- United States5
- Arkansas4
- Mississippi4
- New Jersey4
- North Carolina4
- Northern Cheyenne Indian Reservation4
- Big Horn County3
- Bladen County3
- Delaware3
- Fort Peck Indian Reservation3
- Northern Cheyenne Indian Reservation (Mont.)3
- Robeson County3
- Black Creek Aquifer (S.C. and N.C.)2
- High Plains Aquifer2
- Louisiana2
- Nevada2
- Nevada National Security Site2
- Southern States2
- American Falls Reservoir1