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Region
- Arkansas7
- Chesapeake Bay Region (Md. and Va.)4
- Louisiana4
- Minnesota3
- Alabama2
- Florida2
- Floridan Aquifer2
- Hudson River Watershed2
- Mississippi2
- New York (State)Cattaraugus County2
- Southern States2
- Arizona1
- ArizonaSalt River Valley (Gila County and Maricopa County)1
- Bear Lodge Mountains (Wyo.)1
- Black Hills (S.D. and Wyo.)1
- Colorado1
- Columbia Plateau1
- Delaware River Watershed (N.Y.-Del. and N.J.)1
- FloridaBroward County1
- FloridaEast Lake Tohopekaliga1