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FEMA’s Methodology for Estimating Potential Losses from Disasters

Hazus is a nationally applicable standardized methodology that contains models for estimating potential losses from earthquakes, floods and hurricanes. Hazus uses Geographic Information Systems (GIS) technology to estimate physical, economic and social impacts of disasters. It graphically illustrates the limits of identified high-risk locations due to earthquake, hurricane and floods. Users can then visualize the spatial relationships between populations and other more permanently fixed geographic assets or resources for the specific hazard being modeled, a crucial function in the pre-disaster planning process.

For more information about the Hazus program, please visit the Hazus home page. From there, you can learn how to:

Hazus Modernization

As part of an effort to modernize Hazus, a number of updates have been released or are in progress. The first update was released in January 2015 and provided compatibility of Hazus with ArcGIS 10.2.2 and Windows 8. A service pack to the January release was put out in May 2015 and features several enhancements to the flood module. This included the application of dasymetric General Building Stock (GBS) approach and the implementation of study region aggregation at the custom jurisdiction or neighborhood level.

The most recent release of Hazus available for download below is version 3.0. This release contains a number of underlying software architectural changes, including:

  • Migration of the current database structure away from the Personal Geodatabase (pGDB) format to SQL Server Spatial format
  • Migration of all VB6 code in the Flood model to a combination of C# and .NET
  • Support at the state level for both homogeneous and dasymetric state data, with dasymetric data now serving as the default for analysis
  • Alignment with the Benefit Cost Analysis (BCA) tool (pushed from Task 2)
  • SQL Server-compatible version of CDMS
  • Repair of four major defects in block-level aggregation in the Flood and Hurricane models
  • Since this release will be a major version update for the Hazus software, users of any older Hazus versions will need to uninstall Hazus on their computers and install the new version. Users who want to know a little more about how to install or uninstall Hazus can check out the Download Tutorial and Quick Reference Guide on the FEMA Document Library and the Getting Started Guide, also available in the Document Library. Note: although the container may say 2.1 manuals, these are the most recent versions and can be used with more recent versions of Hazus. Users wishing to preserve their study regions and transfer them to Hazus 3.0 may do so, but only if they are operating on the most recent version of Hazus (2.2 SP01). They will be able to follow the steps outlined in the Getting Started Guide to extract their study regions in Hazus 2.2 SP01 and then upload them into Hazus 3.0 once it is downloaded. Users that are operating on a version of Hazus older than 2.2 SP01 will not be able to extract their study regions and upload to Hazus 3.0 due to major underlying changes occurring in this release. For questions or issues, feel free to contact the Hazus Help Desk at

    For more information about the Modernization effort, follow the Hazus program on Twitter or LinkedIn and subscribe to receive Hazus program updates, or contact the Hazus Outreach team at For more information about the Modernization effort, follow the Hazus program on Twitter or LinkedIn and subscribe to receive Hazus program updates, or contact the Hazus Outreach team at

    Download the Software

    Hazus-MH operates on Esri’s ArcGIS product. Click on the "Hazus-MH Application" link below to download the software. Internet Explorer and Mozilla Firefox web browsers are recommended to perform the download. Google Chrome is not supported. The latest version of Hazus-MH (3.0), must be installed with ArcGIS 10.2.2

    International users may download the Hazus-MH 3.0 software, but not the U.S. state or territory datasets. International users who require technical assistance downloading the software may email the FEMA Map Information eXchange (FMIX) at

    The entire US state dataset and individual state datasets which have now been updated to reflect Census 2010 data are available for download below.

    • Direct Download—select the download image to begin an HTTP download.
    • Managed Download—check all the files you wish to download then select the "Start Managed Download" button.
    • State Datasets—the release of Hazus 3.0 has removed the need to download separate dasymetric and homogeneous state datasets. One download is needed to get both datasets below. While the dasymetric data will act as the default for analysis, the homogeneous data is also available in the download package. As a reminder, with the homogeneous data, building exposure is assumed to be uniformly (homogeneously) distributed throughout a Census block. Hazus-MH has historically used homogeneous Census data. Using these data may lead to estimating losses in sub-Census Block areas with no building exposure. For dasymetric datasets, homogeneous undeveloped areas (such as area covered by bodies of water, parks, or forests) are removed from the Census blocks. The cumulative building exposure is distributed only in developed sub-Census Block areas. Use these data to more accurately produce flood loss determinations. For documentation on how the dasymetric data was produced, please contact Since Earthquake and Hurricane analysis use the tract level data, users of those models will only be using homogeneous data for their analysis.

    Hazus Application

    Hazus State Datasets

    State Direct Download Managed Download
    Alabama DL:Direct Download Hazus Alabama dataset
    Alaska DL:Direct Download Hazus Alaska dataset
    Arizona DL:Direct Download Hazus Arizona dataset
    Arkansas DL:Direct Download Hazus Arkansas dataset
    California DL:Direct Download Hazus California dataset
    Colorado DL:Direct Download Hazus Colorado dataset
    Connecticut DL:Direct Download Hazus Connecticut dataset
    Delaware DL:Direct Download Hazus Delaware dataset
    District of Columbia DL:Direct Download Hazus District of Columbia dataset
    Florida DL:Direct Download Hazus Florida dataset
    Georgia DL:Direct Download Hazus Georgia dataset
    Hawaii DL:Direct Download Hazus Hawaii dataset
    Idaho DL:Direct Download Hazus Idaho dataset
    Illinois DL:Direct Download Hazus Illinois dataset
    Indiana DL:Direct Download Hazus Indiana dataset
    Iowa DL:Direct Download Hazus Iowa dataset
    Kansas DL:Direct Download Hazus Kansas dataset
    Kentucky DL:Direct Download Hazus Kentucky dataset
    Louisiana DL:Direct Download Hazus Louisiana dataset
    Maine DL:Direct Download Hazus Maine dataset
    Maryland DL:Direct Download Hazus Maryland dataset
    Massachusetts DL:Direct Download Hazus Massachusetts dataset
    Michigan DL:Direct Download Hazus Michigan dataset
    Minnesota DL:Direct Download Hazus Minnesota dataset
    Mississippi DL:Direct Download Hazus Mississippi dataset
    Missouri DL:Direct Download Hazus Missouri dataset
    Montana DL:Direct Download Hazus Montana dataset
    Nebraska DL:Direct Download Hazus Nebraska dataset
    Nevada DL:Direct Download Hazus Nevada dataset
    New Hampshire DL:Direct Download Hazus New Hampshire dataset
    New Jersey DL:Direct Download Hazus New Jersey dataset
    New Mexico DL:Direct Download Hazus New Mexico dataset
    New York DL:Direct Download Hazus New York dataset
    North Carolina DL:Direct Download Hazus North Carolina dataset
    North Dakota DL:Direct Download Hazus North Dakota dataset
    Ohio DL:Direct Download Hazus Ohio dataset
    Oklahoma DL:Direct Download Hazus Oklahoma dataset
    Oregon DL:Direct Download Hazus Oregon dataset
    Pennsylvania DL:Direct Download Hazus Pennsylvania dataset
    Puerto Rico DL:Direct Download Hazus Puerto Rico dataset
    Rhode Island DL:Direct Download Hazus Rhode Island dataset
    South Carolina DL:Direct Download Hazus South Carolina dataset
    South Dakota DL:Direct Download Hazus South Dakota dataset
    Tennessee DL:Direct Download Hazus Tennessee dataset
    Texas DL:Direct Download Hazus Texas dataset
    Utah DL:Direct Download Hazus Utah dataset
    Vermont DL:Direct Download Hazus Vermont dataset
    Virginia DL:Direct Download Hazus Virginia dataset
    Washington DL:Direct Download Hazus Washington dataset
    West Virginia DL:Direct Download Hazus West Virginia dataset
    Wisconsin DL:Direct Download Hazus Wisconsin dataset
    Wyoming DL:Direct Download Hazus Wyoming dataset
    All States Part 1 (AL to MO) DL:Direct Download Hazus All States Part 1 (AL to MO) dataset
    All States Part 2 (MT to WY) DL:Direct Download Hazus All States Part 2 (MT to WY) dataset

    Additional Resources