If you have federal or federally related financing for the property in question and you do not already have flood insurance, your lender may contact you once the new map takes effect and require that you purchase the insurance. If you do not purchase flood insurance within 45 days after being informed that flood insurance is required, the lender can force place the insurance and charge you for the cost of it.
If you dispute the lender's determination that your property is located in a floodplain, you and your lender can jointly request a Letter of Determination Review from the Federal Emergency Management Agency (FEMA) within 45 days of being informed by your lender that your property is located in a floodplain.
If you have insurance before the new maps took effect, the basis for rating that policy remains unchanged (i.e., you can use the rate that was charged to you when your property was located outside the floodplain).