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Region
- Arkansas5
- MontanaNorthern Cheyenne Indian Reservation4
- Delaware3
- Mississippi3
- MontanaBig Horn County3
- MontanaFort Peck Indian Reservation3
- New Jersey3
- North CarolinaBladen County3
- North CarolinaRobeson County3
- Northern Cheyenne Indian Reservation (Mont.)3
- Black Creek Aquifer (S.C. and N.C.)2
- High Plains Aquifer2
- NevadaNevada National Security Site2
- Southern States2
- Fort Peck Indian Reservation (Mont.)1
- High Plains (U.S.)1
- IdahoAmerican Falls Reservoir1
- LouisianaBarataria Bay Watershed1
- LouisianaMermentau River Watershed1
- Mississippi River Watershed1