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Region
- Pacific Coast (Calif.)7
- High Plains Aquifer4
- ArizonaPima County3
- Colorado3
- New MexicoCurry County2
- New MexicoLea County2
- TexasGaines County2
- TexasTerry County2
- TexasYoakum County2
- AlaskaFish Creek Region (North Slope Borough)1
- California, Southern1
- CaliforniaHueneme Canyon1
- CaliforniaWhiskeytown Lake1
- Carpinteria (Calif.)1
- ColoradoYampa River1
- Goleta Region (Calif.)1
- Hueneme Canyon (Calif.)1
- Isla Vista Region (Calif.)1
- OregonCrater Lake1
- Pescadero Region (Calif.)1