alert - warning

This page has not been translated into العربية. Visit the العربية page for resources in that language.

Letters of Map Revision and Conditional Letters of Map Revision

A LOMR is a letter from FEMA officially revising the current NFIP map to show changes to floodplains, regulatory floodways, or flood elevations. Reference Code of Federal Regulations Title 44 Parts 60, 65, and 72.  A community or individual can request a LOMR to update the following:

  • Flood Hazard Boundary Map
  • Flood Insurance Rate Map
  • Flood Boundary and Floodway Map
  • Flood Insurance Study Report

A CLOMR is a letter from FEMA commenting on whether a proposed project, if built as proposed, or proposed hydrology changes would meet minimum National Flood Insurance Program standards.

Endangered Species Act requirements for CLOMRs

MT-2 Forms and Instructions

When completing these forms, the requester provides the pertinent data about this request to FEMA. The content of the forms also ensure:

  • data and methodology are based on current conditions
  • qualified professionals have assembled data and performed necessary computations
  • individuals and organizations affected by proposed changes are aware of the changes and have an opportunity to comment.

For additional information about MT-2s requirements and general FEMA guidelines, refer to the documents below.

MT-2 Guidance

PDF Link Icon

FEMA Guidelines and Standards for Flood Risk Analysis and Mapping

MT-2 Requests may be submitted via mail or online.  Online submittals offer a reduced review and processing fee.


FEMA recommends an applicant use the Online Letter of Map Change tool to submit a revision using the Online Letter of Map Change tool.

Submit Your Request

Mailed Submittals

For hardcopy (paper) submittals, the completed package should be submitted to the appropriate address indicated below.

Letter of Map Change Clearinghouse
3601 Eisenhower Avenue, Suite 500
Alexandria, VA 22304-6426

Exception: In Cooperating Technical Partner (CTP) agreements with FEMA, the following counties or states will review and process Letters of Map Revisions and Conditional Letters of Map Revisions: Alabama, Colorado, Illinois, Indiana, North Carolina and Texas. These states have different mail-in information.

Alabama Offices of Water Resources 
Attn: MT-2 Letter of Map Change Coordinator 
401 Adams Avenue 
Montgomery, Alabama 36104
All requests within the state are mailed to this address.
ColoradoMile High Flood District 
Attn: Floodplain Manager 
2480 West 26th Avenue, Suite 156-B 
Denver, Colorado 80211
All requests within the jurisdiction of the Mile High Flood District in Colorado.
Colorado Water Conservation Board 
Attn: Floodplain Mapping Program Manager 
1313 Sherman Street 
Room 718 
Denver, Colorado 80203
Requests for other areas of Colorado are to be mailed to the Colorado Water Conservation Board.
IllinoisBy mail: 
Illinois State Water Survey 
Attn: Chris Hanstad 
2204 Griffith Drive 
Champaign, Illinois 61820-7463
All requests within the state are to be submitted to the Illinois State Water Survey.These requests can also be emailed to
IndianaIndiana Department of Natural Resources 
Division of Water 
402 W. Washington Street, Room W264 
Indianapolis, Indiana 46204-2243 
Attn: LOMR Manager
All request for CLOMRs and LOMRs in Indiana should be mailed to the Indiana Department of Natural Resources.These requests can also be emailed to
KentuckyKentucky Division of Water
300 Sewer Boulevard
Frankfort, Kentucky 40601
Attn: LOMR Manager
All requests within the state are to be submitted to the Kentucky Division of Water.These requests can also be emailed to
North CarolinaCharlotte-Mecklenburg County Storm Water Services Engineering & Mitigation Program 
Attn: Mathew C. Hornack, P.E., CFM, Project Manager 
2145 Suttle Avenue 
Charlotte, North Carolina 28208
All requests within the City of Charlotte and Mecklenburg County are to be mailed to the Charlotte-Mecklenburg Storm Water Services.
North CarolinaNorth Carolina Emergency Management 
Risk Management 
NC MT-2 LOMC Depot 
Attention: Scott Gentry 
4218 Mail Service Center 
Raleigh, North Carolina 27699-4218
Requests for all other areas in North Carolina are mailed here.
Harris County Flood Control District 
Attn: MT-2 Letter of Map Revisions Coordinator 
9900 Northwest Freeway 
Houston, Texas 77092
All requests within Harris County are to be mailed to the Harris County Flood Control District.
TexasSan Antonio River Authority 
Attn: Ecological Engineering Department, LOMC Administrator 
100 East Guenther Street 
San Antonio, Texas 78204
All requests within Bexar, Goliad, Karnes and Wilson counties are to be mailed to the San Antonio River Authority.
TexasLetter of Map Change Clearinghouse 
3061 Eisenhower Avenue, Suite 500 
Alexandria, Virginia 22304-6426
All of the other areas of Texas are to be mailed to Alexandria, Virginia.