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Region
- Minnesota3
- Mississippi River Watershed3
- Florida2
- New England2
- Ozark Mountains2
- Pennsylvania2
- Potomac River Watershed2
- Rio Grande Valley (Colo.-Mexico and Tex.)2
- Susquehanna River Watershed2
- TexasTrinity River Watershed2
- Wisconsin2
- AlabamaBaldwin County1
- ArizonaHavasu Canyon1
- Black Creek Aquifer (S.C. and N.C.)1
- Blackfeet Indian Reservation (Mont.)1
- CaliforniaMonterey County1
- CaliforniaRiverside County1
- Delaware1
- Floridan Aquifer1
- Fort Peck Indian Reservation (Mont.)1