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Region
- Mississippi16
- Florida11
- Floridan Aquifer11
- Mississippi River Valley11
- Gulf Coast (U.S.)10
- Texas8
- Maryland6
- Chesapeake Bay Region (Md. and Va.)4
- North Carolina4
- Arkansas3
- Hudson River Watershed3
- Kansas3
- Magothy Aquifer3
- South Carolina3
- Alabama2
- Black Creek Aquifer (S.C. and N.C.)2
- Louisiana2
- New Mexico2
- Ozark Aquifer (Ark.)2
- Rio Grande Valley2