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Region
- Arkansas2
- DelawareNew Castle County1
- Florida1
- FloridaSaint Johns County1
- FloridaSaint Vincent National Wildlife Refuge1
- Floridan Aquifer2
- Hudson River Watershed1
- IdahoBig Lost River Watershed1
- Indiana1
- Louisiana2
- Memphis (Tenn.)1
- Memphis Aquifer1
- Middle West1
- NebraskaPlatte River Watershed1
- New York (State)Mohawk River Watershed1
- OhioGreene County1
- OhioMontgomery County1
- PennsylvaniaBucks County2
- PennsylvaniaChester County4
- Puerto Rico1