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Region
- Alabama2
- American SamoaAunuu Island1
- American SamoaTutuila Island1
- Arizona4
- ArizonaMaricopa County1
- ArizonaPima County1
- ArizonaSalt River Indian Reservation1
- ArizonaSalt River Valley (Gila County and Maricopa County)2
- Arkansas13
- Black Creek Aquifer (S.C. and N.C.)2
- British Indian Ocean TerritoryDiego Garcia1
- California1
- California, Northern2
- California, Southern2
- CaliforniaAntelope Valley1
- CaliforniaBonsall Region1
- CaliforniaMojave River Watershed1
- CaliforniaSan Bernardino County1
- CaliforniaSan Diego County1
- CaliforniaSan Luis Rey River Valley1