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Region
- Colorado8
- United States6
- Florida5
- New Jersey5
- ArizonaBlack Mesa (Navajo County and Apache County)4
- Floridan Aquifer4
- Montana4
- NevadaYucca Mountain4
- Pennsylvania4
- Wisconsin4
- Arkansas3
- Louisiana3
- New York (State)Nassau County3
- OregonUpper Klamath Lake3
- Red River of the North Watershed3
- Snake River Plain (Idaho and Or.)3
- South Carolina3
- Texas3
- West Virginia3
- Wyoming3