FEMA flood map notices

Flood map changes in Williamson County, Texas

FEMA has published 12 flood hazard notices covering Williamson County, Texas since November 2023. The most recent, map revision flood hazard determinations, was published Jun 11, 2026.

Notices for Williamson County

Jun 11, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 34 other counties
Jan 29, 2026Map revisionChanges in Flood Hazard DeterminationsAlso covers 28 other counties
Nov 20, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 32 other counties
Jul 9, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 21 other counties
May 22, 2025Map revisionChanges in Flood Hazard DeterminationsAlso covers 23 other counties
Nov 7, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 24 other counties
Sep 12, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 32 other counties
Jul 5, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 21 other counties
Apr 22, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 28 other counties
Apr 12, 2024Map revisionChanges in Flood Hazard DeterminationsAlso covers 30 other counties
Nov 9, 2023Map revisionChanges in Flood Hazard DeterminationsAlso covers 58 other counties
Nov 3, 2023Map revisionChanges in Flood Hazard DeterminationsAlso covers 21 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