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Region
- Arkansas7
- Chesapeake Bay Region (Md. and Va.)4
- Hudson River Watershed4
- Louisiana4
- North Carolina4
- Maryland3
- Mississippi3
- New York (State)Oneida County3
- PennsylvaniaChester County3
- Southern States3
- Black Hills (S.D. and Wyo.)2
- Florida2
- Magothy Aquifer2
- New York (State)Cattaraugus County2
- New York (State)Croton River Watershed2
- New York (State)Westchester County2
- South Carolina2
- ArizonaMaricopa County1
- ArizonaSalt River Valley (Gila County and Maricopa County)1
- Bear Lodge Mountains (Wyo.)1