National Flood Insurance Program: Flood Hazard Mapping

Main Content

Flood Hazard Mapping

Through its Flood Hazard Mapping Program, FEMA identifies flood hazards, assesses flood risks and partners with states and communities to provide accurate flood hazard and risk data to guide them to mitigation actions. Flood Hazard Mapping is an important part of the National Flood Insurance Program (NFIP), as it is the basis of the NFIP regulations and flood insurance requirements.  FEMA maintains and updates data through Flood Insurance Rate Maps (FIRMs) and risk assessments.  FIRMs include statistical information such as data for river flow, storm tides, hydrologic/hydraulic analyses and rainfall and topographic surveys.  FEMA uses the best available technical data to create the flood hazard maps that outline your community’s different flood risk areas.

Click any of the links below to learn more about Flood Hazard Mapping: 

envelope icon Flood Hazard Mapping News e-mail updates


The Federal Emergency Management Agency's (FEMA) Federal Insurance and Mitigation Administration (FIMA) maintains and updates the National Flood Insurance Program maps.

To keep up with the latest developments in Flood Hazard Mapping, please visit What's New in Flood Hazard Mapping. You can also sign up for e-mail updates using the "Flood Hazard Mapping News e-mail updates" link at the top of this page.

For more information you may e-mail or call a Map Specialist in the FEMA Map Information eXchange; toll free, at 1-877-FEMA MAP (1-877-336-2627)


How to View and Obtain Flood Maps

You may view and order copies of the effective maps and other NFIP products through the Map Service Center. Your local Community Map Repository, usually located in the planning and zoning office, also has copies of flood maps. Please call the FEMA Map Information eXchange, toll free at 1-877-FEMA MAP (1-877-336-2627), or e-mail a Map Specialist to determine the location of your Community Map Repository.


Change my Flood Zone Designation

If a property owner thinks their property has been inadvertently mapped in a Special Flood Hazard Area (SFHA), they may submit a request to FEMA for a Letter of Map Change (LOMC). A SFHA is defined as the area that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year. A LOMC reflects an official revision/amendment to an effective Flood Insurance Rate Map (FIRM). If the LOMC request is granted, property owners may be eligible for lower flood insurance premiums or the option to not purchase flood insurance.

Applicants can now use the Online LOMC, an internet-based tool, to easily request a Letter of Map Amendment (LOMA). A LOMA is a letter from FEMA stating that an existing structure or parcel of land - that is on naturally high ground and has not been elevated by fill - would not be inundated by the base flood. This new tool is a convenient way for applicants to upload all information and supporting documentation and check the status of their application online. Users can submit LOMA requests through this tool instead of filing the MT-EZ paper form via mail.

Get started today using the new Online LOMC application.


View your Community’s Preliminary Flood Hazard Data

Preliminary flood hazard data provide an early look at your home or community’s risk to flood hazards. There are many benefits to viewing your community’s data before it becomes effective. For more information, visit the Preliminary Flood Hazard Data Page.  


What is the Difference Between the eLOMA and the Online LOMC?

The eLOMA is a web-based application within the Mapping Information Platform (MIP) that provides licensed land surveyors and professional engineers (Licensed Professionals) with a system to submit simple Letter of Map Amendment (LOMA) requests to FEMA. This tool is designed to make a determination based on the information submitted by the Licensed Professional and allow them to generate a determination from FEMA in minutes. The initial release of eLOMA will enable Licensed Professionals to make requests for existing single residential structures or properties, provided no fill has been placed to raise the elevations of the structure or property. Approximately half of the LOMAs processed annually (about 10,000 cases) meet the requirements of eLOMA.  For more information on the eLOMA, visit the eLOMA website.

The Online LOMC tool is available to any applicant who would like to submit a LOMA request directly to FEMA and does not require a surveyor or engineer to submit. All LOMA requests may be processed through the Online LOMC. A determination resulting from information submitted via Online LOMC is not received until after FEMA reviews the supporting documentation.  This process may take up to 60 days.


Coastal Projects

The FEMA Coastal Flood Risk webpages provide information about current and ongoing FEMA coastal projects, the coastal flood risk study process, guidance on rebuilding after a coastal storm, coastal resources, frequently asked questions and more.


Risk MAP (Mapping, Assessment, and Planning) Multi Year Plan

FEMA is initiating Risk Mapping, Assessment and Planning (Risk MAP) and has developed a multi year plan spanning FY10-FY14. The vision for Risk MAP is to deliver quality data that increases public awareness and leads to action that reduces risk to life and property. Risk Mapping, Assessment, and Planning (Risk MAP) Multi-Year Plan: Fiscal Years 2010 - 2014 was approved on March 16, 2009. To learn more about Risk MAP, visit the Risk Map home page.


Cooperating Technical Partners (CTP)

The CTP Program is an innovative approach to creating partnerships between FEMA and participating NFIP communities, regional agencies and state agencies that have the interest and capability to become more active participants in the FEMA Flood Hazard Mapping program.


Last Updated: 
07/30/2014 - 22:44
Back to Top