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Region
- United States4
- Florida3
- Connecticut River Watershed2
- ConnecticutThames River Watershed2
- Georgia2
- Housatonic River Watershed (Mass. and Conn.)2
- Maryland2
- Nebraska2
- New Jersey2
- Oklahoma2
- Red River of the North Watershed2
- Wisconsin2
- AlaskaAnchorage1
- CaliforniaEdwards Air Force Base1
- CaliforniaSan Bernardino County1
- CaliforniaSan Joaquin Valley1
- Chattahoochee River Watershed1
- Choptank River (Del. and Md.)1
- Colorado1
- Columbia Aquifer1