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Region
- PennsylvaniaChester County7
- Arkansas3
- Delaware3
- Louisiana3
- Mississippi3
- New Jersey3
- High Plains (U.S.)2
- High Plains Aquifer2
- NevadaNevada National Security Site2
- New JerseyOcean County2
- New Mexico2
- OhioChampaign County2
- OhioClark County2
- Rio Grande Valley2
- Santa Fe Group2
- TexasEdwards Plateau Region2
- TexasTrinity River Watershed2
- American SamoaTutuila Island1
- CaliforniaAntelope Valley1
- CaliforniaMojave River Watershed1