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Region
- Mississippi11
- Gulf Coast (U.S.)10
- Mississippi River Valley8
- Texas8
- Louisiana3
- Arkansas2
- Black Creek Aquifer (S.C. and N.C.)2
- Indiana2
- MontanaNorthern Cheyenne Indian Reservation2
- PennsylvaniaBucks County2
- Sunbelt States2
- TexasEdwards Plateau Region2
- TexasTrinity River Watershed2
- Wilcox Group2
- WyomingCheyenne Region2
- Arizona1
- Coeur d'Alene Lake (Idaho)1
- FloridaOrange County1
- FloridaOrlando Region1
- High Plains Aquifer1