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Region
- Mississippi19
- Louisiana14
- Arkansas12
- Gulf Coast (U.S.)10
- Mississippi River Valley10
- Maryland7
- Texas7
- Chesapeake Bay Region (Md. and Va.)5
- Southern States5
- Floridan Aquifer4
- Hudson River Watershed4
- North Carolina4
- South Carolina4
- Florida3
- Magothy Aquifer3
- Minnesota3
- New York (State)Oneida County3
- Alabama2
- Black Creek Aquifer (S.C. and N.C.)2
- Colorado2