North San Francisco Bay Study Unit
![Map showing the Napa/Sonoma study unit.](https://webarchive.library.unt.edu/eot2008/20090508152037im_/http://ca.water.usgs.gov/gama/Maps/su_snapa.gif)
The North SF Bay Study Unit consists of 3 study areas:
- Volcanic Highlands; 20 wells sampled
- Valley and Plains (Alexander Valley, Kenwood Valley, Lower Russian River Valley, Napa/Sonoma Valley, Petaluma Valley, Santa Rosa Valley); 54 wells sampled
- Wilson Grove Formation Highlands; 15 wells sampled
The 3 study areas fall in Sonoma, Napa, Marin, Lake and Solano counties.
Data series report: Ground-Water Quality Data in the North San Francisco Bay Hydrologic Provinces, California, 2004: Results from the California Ground-Water Ambient Monitoring and Assessment (GAMA) Program
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