A LOMR reflects an official change to an effective Flood Insurance Rate Map (FIRM).

LOMRs are issued in response to a request for FEMA to revise or amend its effective flood map to remove a property or reflect changed flooding conditions on the effective map.

• LOMRs may be initiated by the community or by FEMA. Communities may submit LOMR applications on behalf of property owners with the owner’s representatives providing all of the analyses, and the property owners paying all fees
• Communities may initiate LOMRs through the Cooperating Technical Partner (CTP) process, in which communities develop data to update FIRMs and Flood Insurance Studies in cooperation with FEMA
• FEMA may initiate a LOMR to provide updates for a portion of a community’s FIRM without issuing new FIRMs
• A Physical Map Revision (PMR) is a large-scale LOMR which typically affects two or more map panels