FEMA flood map notices

Flood map changes in San Joaquin County, California

FEMA has published 11 flood hazard notices covering San Joaquin County, California since November 2023. The most recent, map revision flood hazard determinations, was published Aug 21, 2026.

Notices for San Joaquin County

Aug 21, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 19 other counties
Jun 11, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 29 other counties
Jan 29, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 14 other counties
Dec 18, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 28 other counties
Aug 20, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 37 other counties
May 22, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 23 other counties
Jan 8, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 31 other counties
May 31, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 55 other counties
Feb 16, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 26 other counties
Jan 5, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 47 other counties
Dec 15, 2023Map revisionChanges in Flood Hazard DeterminationsAlso covers 22 other counties

Also covered by these notices

FEMA often studies whole watersheds, so one notice can span several counties.

What these notices mean

Proposed: FEMA has new draft flood maps. This starts a 90-day window when owners can appeal with technical data. It's the best time to act.
Final: Appeals are resolved. The new maps usually take effect about six months later, when lenders start applying the new zones.
Map revision: A Letter of Map Revision changes one stretch of the map, often after a levee, channel project or new survey.

Notices are organized by county and community, so a notice for your county doesn't mean your property is changing zones. What flood zones mean