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Region
- Mississippi16
- Gulf Coast (U.S.)10
- Mississippi River Valley9
- Texas9
- Maryland7
- Chesapeake Bay Region (Md. and Va.)5
- Magothy Aquifer4
- North Carolina4
- Arkansas3
- Florida3
- Hudson River Watershed3
- South Carolina3
- Alabama2
- Black Creek Aquifer (S.C. and N.C.)2
- Floridan Aquifer2
- High Plains Aquifer2
- Kansas2
- New Mexico2
- Rio Grande Valley2
- Santa Fe Group2