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Region
- Mississippi22
- Louisiana16
- Arkansas13
- Gulf Coast (U.S.)10
- Mississippi River Valley10
- Florida8
- Maryland8
- PennsylvaniaChester County8
- Texas8
- Floridan Aquifer7
- Southern States7
- Chesapeake Bay Region (Md. and Va.)6
- Magothy Aquifer6
- High Plains Aquifer5
- North Carolina5
- Arizona4
- Colorado4
- Hudson River Watershed4
- Minnesota4
- New Mexico4