Groundwater Info Center

2003 Basins and Subbasins of the San Francisco Bay Hydrologic Region

Basin/subbasin Basin name

2-01 Petaluma Valley
2-02 Napa-Sonoma Valley
        2-02.01 Napa Valley
        2-02.02 Sonoma Valley
        2-02.03 Napa-Sonoma Lowlands
2-03 Suisun-Fairfield Valley
2-04 Pittsburg Plain
2-05 Clayton Valley
2-06 Ygnacio Valley
2-07 San Ramon Valley
2-08 Castro Valley
2-09 Santa Clara Valley
        2-09.01 Niles Cone
        2-09.02 Santa Clara
        2-09.03 San Mateo Plain
        2-09.04 East Bay Plain
2-10 Livermore Valley
2-11 Sunol Valley
2-19 Kenwood Valley
2-22 Half Moon Bay Terrace
2-24 San Gregorio Valley
2-26 Pescadero Valley
2-27 Sand Point Area
2-28 Ross Valley
2-29 San Rafael Valley
2-30 Novato Valley
2-31 Arroyo Del Hambre Valley
2-32 Visitacion Valley
2-33 Islais Valley
2-35 Westside
2-36 San Pedro Valley
2-37 South San Francisco
2-38 Lobos
2-39 Marina
2-40 Downtown San Francisco

San Francisco Bay Hydrologic Region Map

Click to enlarge - San Francisco Bay Hydrologic Region Map