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Region
- TexasHouston Region12
- Harris-Galveston Coastal Subsidence District (Tex.)10
- High Plains (U.S.)9
- High Plains Aquifer9
- Louisiana8
- Arkansas7
- Delaware6
- New Jersey5
- Kansas3
- Minnesota3
- New York (State)Long Island3
- North CarolinaBladen County3
- North CarolinaRobeson County3
- Alabama2
- Black Creek Aquifer (S.C. and N.C.)2
- Colorado2
- KansasLittle Arkansas River2
- Middle West2
- Mississippi2
- Mississippi River Watershed2