Region
- South Carolina4
- Nevada3
- New York (State)Oneida County3
- New York (State)Westchester County3
- Alabama2
- ArizonaSalt River Valley (Gila County and Maricopa County)2
- Black Creek Aquifer (S.C. and N.C.)2
- California, Northern2
- California, Southern2
- Columbia Plateau2
- FloridaBroward County2
- FloridaOrange County2
- High Plains (U.S.)2
- MarylandAnnapolis Region2
- NebraskaPlatte River Watershed2
- New York (State)Cattaraugus County2
- New York (State)Croton River Watershed2
- Northern Mariana IslandsSaipan2
- Puerto Rico2
- Rio Grande Valley2