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Region
- American SamoaTutuila Island1
- ArizonaMaricopa County1
- ArizonaSalt River Valley (Gila County and Maricopa County)2
- ArizonaTucson Aqueduct1
- FloridaEast Lake Tohopekaliga1
- FloridaHernando County1
- FloridaHighlands County2
- FloridaHillsborough County3
- FloridaHunters Lake1
- FloridaLoxahatchee River Watershed1
- FloridaOrange County1
- FloridaOsceola County1
- High Plains (U.S.)1
- High Plains Aquifer1
- Hunters Lake (Fla.)1
- Indiana1
- KentuckyJefferson County1
- LouisianaVernon Parish1
- MassachusettsWalden Pond (Middlesex County)1
- Minnesota5