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Region
- Georgia3
- Black Hills Region (S.D. and Wyo.)2
- High Plains Aquifer2
- MissouriIndependence Region2
- Alabama1
- AlabamaMontgomery1
- 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
- CaliforniaLos Angeles County1
- CaliforniaSacramento Valley1
- CaliforniaSanta Ana River Watershed1
- Camp Bullis (Tex.)1
- ColoradoDenver Region1
- ColoradoGore Creek Watershed (Eagle County)1
- Death Valley (Calif. and Nev.)1
- Deschutes River Watershed (Or.)1
- Edwards Aquifer (Tex.)1