The California Geological Survey released six New Preliminary Seismic Hazard Zone Maps for Contra Costa County. Seismic Hazard Zones include areas with potential for ground deformation caused by landslides or liquefaction.

After a public review period, the official version of the maps is expected to become official on February 22, 2024. Affected cities include Concord, Danville, El Cerrito, Hercules, Lafayette, Martinez, Pinole, Pleasant Hill, Richmond, San Pablo, San Ramon, and Walnut Creek. Once the maps become official, the new zoning will be reflected in HomeGuard Natural Hazard Disclosure Reports.

If you would like either an in-office or Zoom presentation about this new information, please get in touch with HomeGuard’s NHD Vice President of Disclosure Services, Ted Stephanos at or 408-690-2149