Bulletin 118
Groundwater Information Center Groundwater Basin Maps and Descriptions Hydrologic Regions of California: San Francisco BayBasins and Subbasins of the San Francisco Bay Hydrologic Region
To access only the basin and subbasin descriptions for this Hydrologic Region, click on the individual basin/subbasin number below. To view a map of basin and subbasin boundaries and download individual or all basin and subbasin descriptions for this Hydrologic Region, go to DWR's Integrated Water Resources Information System (IWRIS) web site. IWRIS is a GIS-based web application that allows the user to access, query, integrate, and visualize different sets of data. For the instructions on how to view groundwater basin and subbasin maps, and download basin and subbasin descriptions, click on the How do I use IWRIS? link.
Basin/subbasin Basin name
2-1 Petaluma Valley
2-2 Napa-Sonoma Valley
2-2.01 Napa Valley
2-2.02 Sonoma Valley
2-2.03 Napa-Sonoma Lowlands
2-3 Suisun-Fairfield Valley
2-4 Pittsburg Plain
2-5 Clayton Valley
2-6 Ygnacio Valley
2-7 San Ramon Valley
2-8 Castro Valley
2-9 Santa Clara Valley
2-9.01 Niles Cone
2-9.02 Santa Clara
2-9.03 San Mateo Plain
2-9.04 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
If posted PDF files are not in an accessible text based format, please request an accessible version via the Comments and Suggestion page.
If you still need assistance, contact the DWR Webmaster.