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Region
- ArizonaBlack Mesa Region (Navajo County and Apache County)1
- ArizonaSalt River Watershed1
- ArizonaVerde River Watershed1
- Assateague Island National Seashore (Md. and Va.)1
- Big Elk Creek Watershed (Pa. and Md.)1
- Black Hills Region (S.D. and Wyo.)1
- CaliforniaLos Angeles County1
- CaliforniaSanta Ana River Watershed1
- Camp Bullis (Tex.)1
- ColoradoDenver Region1
- ColoradoGore Creek Watershed (Eagle County)1
- Deschutes River Watershed (Or.)1
- Edwards Aquifer (Tex.)1
- Front Range Region (Colo. and Wyo.)1
- Georgia1
- HawaiiOahu1
- High Plains (U.S.)1
- High Plains Aquifer1
- Little Colorado River Watershed (N.M. and Ariz.)1
- Madison Aquifer1