Private Flood Insurance and the National Flood Insurance Program [Updated December 21, 2021] [open pdf - 1MB]
From the Summary: "The National Flood Insurance Program (NFIP) is the main source of primary flood insurance coverage in the United States, collecting over $4.6 billion in premiums, fees, and surcharges for over five million flood insurance policies. This is in contrast to the majority of other property and casualty risks, such as damage from fire or accidents, which are covered by a broad array of private insurance companies. One of the primary reasons behind the creation of the NFIP in 1968 was the withdrawal by private insurers from providing flood insurance coverage, leaving flood victims largely reliant on federal disaster assistance to recover after a flood. While private insurers have taken on relatively little flood risk, they have been involved in the administration of the NFIP through sales and servicing of policies and claims."
CRS Report for Congress, R45242
Congressional Research Service: https://crsreports.congress.gov/