Your homeowners policy doesn't cover damage from flooding, and you can't simply purchase flood insurance as an endorsement to your policy like you might expect. Instead, you must purchase a separate flood insurance policy through an insurance company that participates in the National Flood Insurance Program (NFIP), a partnership between the Federal Emergency Management Agency (FEMA) and the private insurance industry. A flood insurance policy can offer you protection for both the building and its contents. You are eligible to purchase flood insurance if your community is one of the approximately 19,000 nationwide that participate in the National Flood Insurance Program. The participating communities must adopt certain floodplain management practices in exchange for the availability of flood insurance for their residents.
Buy flood insurance
Or contact the seller
in section "Insurance upon unforeseen circumstances"