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Region
- Mississippi14
- Gulf Coast (U.S.)11
- Mississippi River Valley9
- Texas9
- Arkansas8
- Maryland6
- Chesapeake Bay Region (Md. and Va.)4
- North Carolina4
- South Carolina4
- Tennessee4
- Hudson River Watershed3
- Magothy Aquifer3
- Santa Fe Group3
- Wilcox Group3
- Alabama2
- Black Creek Aquifer (S.C. and N.C.)2
- Edwards Aquifer (Tex.)2
- Kansas2
- New Mexico2
- Rio Grande Valley2