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Region
- United States29
- New Jersey8
- Wyoming8
- Floridan Aquifer6
- Florida5
- ArizonaBlack Mesa (Navajo County and Apache County)4
- CaliforniaMojave River Watershed4
- CaliforniaMorongo Valley4
- Pennsylvania4
- High Plains Aquifer3
- Iowa3
- Montana3
- Nebraska3
- New York (State)Nassau County3
- Oregon3
- West (U.S.)3
- WyomingPlatte County3
- Brooklyn (New York, N.Y.)2
- CaliforniaSan Bernardino County2
- Colorado2