Description: FEMA data is available at http://msc.fema.gov/portal and can also be consumed as a map service from here https://hazards.fema.gov/gis/nfhl/rest/services/FIRMette.FEMA publishes a Flood Map Viewer with detailed layer information here: https://www.arcgis.com/apps/webappviewer/index.html?id=e7a7dc3ebd7f4ad39bb8e485bb64ce44These zones are used by FEMA to designate the SFHA and for insurance rating purposes. These data are the regulatory flood zones designated by FEMA.