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Region
- North Carolina4
- Chesapeake Bay Region (Md. and Va.)3
- Hudson River Watershed3
- Maryland3
- Magothy Aquifer2
- Arkansas1
- Black Creek Aquifer (S.C. and N.C.)1
- Delaware River Watershed (N.Y.-Del. and N.J.)1
- Florida1
- High Plains Aquifer1
- Kansas1
- Mississippi River Valley1
- New York (State)Adirondack Mountains1
- New York (State)Mohawk River1
- Niagara River Watershed (N.Y. and Ont.)1
- OhioLucas County1
- OhioSandusky County1
- OhioWood County1
- Puerto RicoCaguas1
- Texas1