Title 42 › CHAPTER 50 — NATIONAL FLOOD INSURANCE › SUBCHAPTER II — ORGANIZATION AND ADMINISTRATION OF FLOOD INSURANCE PROGRAM › Part A — Industry Program With Federal Financial Assistance › § 4057
Create and publish a standard method called the COASTAL Formula, within 180 days after the related protocol is set, to split damage between wind and flood for claims where the cause is unclear (indeterminate losses). The formula must use data like the Coastal Wind and Water Event Database, elevation certificates or similar flood-risk information, any credible pre-storm evidence about the property, and other needed measures. It can use a post-storm assessment to assign flood damage only if the NOAA Under Secretary certifies that the assessment is at least 90% accurate for that specific loss. FEMA may use the formula and assessments to review and validate payments, help the National Flood Insurance Program pay proper flood claims, and avoid paying for non-flood causes. After a presidential major disaster for a named storm, FEMA may use the formula to decide and pay flood losses for indeterminate claims, but only after the National Academy of Sciences reviews the formula (and any changes) and reports the formula will not harm the flood insurance fund and can reach at least 90% accuracy. Up to $750,000 from the National Flood Insurance Fund is allowed for that review. If the formula is used for a claim, FEMA must tell the policyholder within 30 days and give a short summary of the result. A certified NFIP adjuster who knowingly makes a false indeterminate finding can be fined up to $1,000, with fines paid into the flood fund. The formula only applies to storms that happen 60 days after it is published, does not force FEMA or insurers to pay, does not change policy limits, and does not create a new private legal right. The Secretary must consult NOAA, NIST, the Army Corps of Engineers, USGS, the federal meteorology office, state coastal insurance regulators, and other experts when making the formula, and required items may be added to elevation certificates or other records. Definitions (one line each): Administrator = FEMA Administrator; COASTAL Formula = the standard loss-allocation method; Coastal State = coastal state under law, except places with an operational wind-and-flood allocation system; Indeterminate loss = combined wind-and-flood damage from a named storm, decided by a NFIP-certified adjuster (only when no building remnants except foundations remain and there is insufficient tangible evidence); Named storm = NHC-named tropical storm or hurricane with winds of at least 39 miles per hour; Post-storm assessment = the assessment under 33 U.S.C. 3611(b); State = a U.S. State, DC, Puerto Rico, or other U.S. territory; Secretary = Secretary of Homeland Security; Standard insurance policy = an NFIP flood insurance policy; Property = insured real or personal property; Under Secretary = NOAA’s Under Secretary for Oceans and Atmosphere.
Full Legal Text
The Public Health and Welfare, Source: USLM XML via OLRC
Legislative History
Reference
Citation
42 U.S.C. § 4057
Title 42, The Public Health and Welfare
Last Updated
Sep 23, 2026
Release point: 119-110