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FEMA LOMC: Letter of Map Change

As a public service, MarinMap publishes FEMA (Federal Emergency Management Agency) Flood Insurance Rate Maps (FIRM) and Letters of Map Change (LOMC).  These maps and documents help property owners determine if property is within a flood hazard area and is required to carry flood insurance (for homes and buildings in high-risk flood areas with mortgages from federally regulated or insured lenders).  Letters of Map Change are documents that may remove properties, buildings, or other areas from FEMA's Special Flood Hazard Areas (SFHA).


This GIS application (see link below) will provide most of the data required for the LOMC application.  If you believe that your property or structures on your property are above the elevation that FEMA determines to be within a flood hazard zone, you may apply for a Letter of Map Change.  If you can show that your property/structures are above the flood elevation, you might be exempt from flood insurance requirements or be subject to cheaper insurance premiums.

Desktop FEMA Flood App

NOTE – Each of FEMA'S map panels may have different effective dates.  MarinMap will post any new FIRM data as it is received from FEMA, but cannot guarantee that this GIS application is up date.  FEMA is responsible for all errors or omissions within their maps and documents.  Note that parcel boundaries are not survey precise.


Helpful web sites:


National Flood Insurance Program (NIFP)

FEMA Flood Hazard Forms

Floodplain Administrators for Marin communities
JurisdictionStaff NamePhone Numberemail Address
BelvedereEric Banvard(415) 435-3838
Corte MaderaPeter Brown(415) 927-5057
FairfaxMark Lockaby(415) 453-2370
LarkspurDaryl Phillips(707) 544-9500
Mill ValleyPatrick Kelly(415) 388-4033
NovatoManijeh Larizadeh(415) 899-8907
RossRobert Maccario(415) 453-1453 x163
San AnselmoSean Condry(415) 258-4616
San RafaelApril Miller(415) 485-3355
SausalitoKevin McGowan(415) 289-4176
TiburonScott Anderson(415) 435-7392
UnincorporatedBerenice Davidson(415) 473-3770