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Region
- Louisiana3
- ArizonaMaricopa County2
- ArizonaSalt River Valley (Gila County and Maricopa County)2
- Columbia Plateau2
- FloridaHillsborough County2
- Floridan Aquifer2
- NevadaHumboldt River Watershed2
- New JerseyRancocas Creek Watershed2
- New York (State)Cattaraugus County2
- Northern Mariana IslandsSaipan2
- Alamosa River (Colo.)1
- American SamoaTutuila Island1
- ArizonaPinal County1
- ArizonaTucson Aqueduct1
- Arkansas River Valley1
- Arnold Air Force Base (Tenn.)1
- Big Sioux Aquifer (S.D.)1
- Black Hills (S.D. and Wyo.)1
- ColoradoConejos County1
- ColoradoJackson County1