When buying a parcel of land in proximity to a 100-year flood plain, you may be asked to provide an elevation certificate to determine how much flood insurance (if any) you are required to have. The government has identified and mapped certain areas of land that are prone to flooding.
Land upon which flooding is expected to occur within 100 years is considered a Special Flood Hazard Area (SFHA), and FEMA requires any parcel of land purchased in these zones to carry flood insurance as prescribed by the National Flood Insurance Program (NFIP).
NOTE: If the residential lot in question has a current elevation certificate (EC) on file and no changes need to be made, you may not be asked for a new one in order to obtain flood insurance.