The National Flood Hazard Layer (NFHL) Viewer is provided by the Federal Emergency Management Agency (FEMA).

The online viewer represents the current effective flood data for the country, where maps have been modernized. It is a compilation of effective Flood Insurance Rate Map (FIRM) databases and Letters of Map Revision (LOMRS). The NFHL is updated as studies go effective. 

For more information, visit FEMA's Map Service Center (MSC).