A property owner would only be required to purchase flood insurance if they are within the 1% annual chance floodplain (also known as the 100-yr. floodplain) and they have a mortgage that is federally backed. Though it is still strongly recommended for a property owner in the floodplain to have flood insurance even if they don’t have a federally backed mortgage.
In addition to mitigation measures that may lower risk-based insurance rates, a Letter of Map Change (LOMC) could also be considered. You can learn about LOMCs on the Floodplain Team’s LOMC webpage, and learn more about insurance rating and mitigation efforts on the Floodplain Team’s Flood Insurance webpage.