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Region
- Maryland5
- Mississippi3
- Magothy Aquifer2
- PennsylvaniaChester County2
- ArizonaSalt River Indian Reservation1
- Arkansas1
- ColoradoConifer Region1
- DelawareNew Castle County1
- High Plains (U.S.)1
- High Plains Aquifer1
- Louisiana1
- Missouri1
- MontanaFort Peck Indian Reservation1
- New York (State)Allegany County1
- New York (State)Mohawk River Watershed1
- New York (State)Schuyler County1
- New York (State)Steuben County1
- New York (State)Tioga County1
- North Carolina1
- Puerto Rico1