Insurance agents working with the owners of more than 750,000 high-risk homes may have trouble finding accurately priced flood policies thanks to missing, outdated and inaccurate data from the National Flood Insurance Program. According to a recently released technical report from the National Research Council, FEMA has accurate elevation data on just 240,000 properties that enjoy subsidized insurance rates - just one-quarter of the homes under its purview. Even more worrying is the fact that the most at-risk homes - low-lying older buildings near high-frequency flood plains - are most often those whose information is missing.