Flood insurance rates are determined by the current effective FIRMs. If, according to the new preliminary maps, your property is located in an SFHA and is mortgaged through a federally regulated and insured lender, you will be required to purchase flood insurance once the preliminary map becomes effective. There is time—the updated maps are not scheduled to go effective until 2022 or 2023. However, flooding can happen wherever it rains, which means purchasing flood insurance is a good idea even for property owners in low-risk areas.