Letters of Map Amendment (LOMAs) and Letters of Map Revision--Based on Fill (LOMR-Fs) do not expire, but they can be superseded by a new Flood Insurance Rate Map (FIRM).

LOMAs and LOMR-Fs are transferable to future owners.

When FEMA prepares to revise a FIRM, the associated LOMAs and LOMR-Fs that are affected by the revision are reviewed and incorporated when appropriate.

When preparing a Preliminary Map or revised map panel, FEMA sends a Summary of Map Actions (SOMA) to the community which identifies all LOMCs issued for a community and whether:

• The LOMA or LOMR-F will be incorporated into the new FIRM and the floodplain boundary revised to show the area outside of the Special Flood Hazard Area (SFHA)
• The LOMA or LOMR-F is likely to be superseded by new information on the FIRM and will no longer be valid
• The LOMA or LOMR-F is likely to be revalidated when the new map panel is published
• More information is required to make a determination

When the effective FIRM is issued, FEMA issues a Revalidation Letter which lists the LOMCs that are still in effect for the new FIRM.