The Federal Emergency Management Agency (FEMA) Flood Insurance program requires that an Elevation Certificate be completed by a Licensed Land Surveyor. In Suffolk County FEMA completed the remapping and update of the Flood Insurance Rate Maps (FIRM) in 2009. The official adoption date of the the new flood mapping was September 25, 2009. The vertical datum (sea level reference) was changed to the North American Vertical Datum 1988 (NAVD88) from the old National Geodetic Vertical Datum 1929 (NGVD29).