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Region
- Florida9
- Minnesota8
- Oklahoma6
- Southern States6
- Floridan Aquifer5
- Mississippi4
- Puerto Rico4
- Washington (State)Puget Sound Region4
- Alabama3
- Columbia Plateau3
- Georgia3
- Michigan3
- Mississippi Embayment3
- New JerseyGloucester County3
- New JerseyOcean County3
- New York (State)Cortland County3
- New York (State)Oneida County3
- Ogallala Aquifer3
- United States3
- ArizonaFlagstaff Region2