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Region
- Mississippi21
- Montana18
- Louisiana15
- Arkansas13
- Gulf Coast (U.S.)10
- Mississippi River Valley10
- Texas8
- Maryland7
- Southern States6
- Chesapeake Bay Region (Md. and Va.)5
- Black Creek Aquifer (S.C. and N.C.)4
- Floridan Aquifer4
- Hudson River Watershed4
- North Carolina4
- South Carolina4
- Delaware3
- Florida3
- Judith River Formation3
- Lakota Formation3
- Magothy Aquifer3