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Region
- Puerto Rico5
- Alabama4
- CaliforniaSan Diego County3
- Florida3
- Arkansas2
- Colorado2
- HawaiiMaui County2
- High Plains Aquifer2
- Kansas2
- Lake Traverse Indian Reservation (N.D. and S.D.)2
- South DakotaRoberts County2
- Tennessee2
- AlaskaDillingham Region1
- AlaskaSeward Region1
- Batavia Kill Watershed (Greene County, N.Y.)1
- Big Wood River Watershed (Idaho)1
- Black Creek Aquifer (S.C. and N.C.)1
- Blackfeet Reservation (Mont.)1
- Blackstone River Watershed (Mass. and R.I.)1
- Bristol Bay (Alaska)1