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Letter of Final Determination

Published by FEMA/RESILIENCE/FIMA | Department of Homeland Security | Catalog Last Checked: May 06, 2026 at 11:14 AM | Dataset Last Updated: September 01, 2025 at 08:42 PM
A Letter of Final Determination (LFD) is a letter FEMA mails to the Chief Executive Officer of a community stating that a new or updated Flood Insurance Rate Map (FIRM) or Digital Flood Insurance Rate Map (DFIRM) will become effective in six months. The letter also notifies each affected flood-prone community participating in the National Flood Insurance Program (NFIP) that it must adopt a compliant floodplain management ordinance by the map effective date to remain participants in good standing in the NFIP.

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