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Region
- Alabama11
- New Hampshire6
- Edwards Aquifer (Tex.)5
- NevadaNye County4
- Arizona3
- Georgia3
- Kansas3
- MissouriFort Leonard Wood3
- Nevada3
- Northern Mariana IslandsSaipan3
- Utah3
- CaliforniaSan Bernardino County2
- CaliforniaSan Francisco2
- Colorado2
- Columbia Plateau2
- Connecticut River Watershed2
- Floridan Aquifer2
- HawaiiMaui2
- HawaiiMolokai2
- HawaiiOahu2