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Region
- Mississippi29
- Louisiana23
- Montana18
- Floridan Aquifer17
- Arkansas16
- Mississippi River Valley16
- Florida14
- High Plains Aquifer12
- TexasHouston Region11
- Gulf Coast (U.S.)10
- Harris-Galveston Coastal Subsidence District (Tex.)10
- Kansas10
- Southern States8
- Texas8
- Maryland7
- Black Hills (S.D. and Wyo.)5
- Chesapeake Bay Region (Md. and Va.)5
- Edwards Aquifer (Tex.)5
- Maryland, Southern5
- New Mexico5