Flood Risk Beyond Your Lender’s Insurance Requirement

• 13,039,240 properties were outside special flood hazard areas or digitally unmapped in GAO’s published comparison. That is 81.3% of its 16,029,433 model-defined high-risk properties.
• 86% lacked NFIP coverage in GAO’s estimate for April 30, 2026. This refers to the high-risk group overall, not just properties outside mapped hazard areas. It excludes private insurance and is not a total uninsured rate.
• These are properties, not households. The analysis includes residential and nonresidential properties across the 50 states and Washington, D.C. The risk categories come from First Street’s commercial model, not new FEMA designations.

Source: GAO-27-108012, Table 1, Figure 1 and Appendix I. FinanceFirst contributes source synthesis, reproducible arithmetic and hypothetical household examples.

Dates: GAO source release: October 1, 2026. FinanceFirst first publication: November 11, 2026. Substantive revision and research check: November 11, 2026; version 1.1. Data reference dates are explained below.

The hero is an AI-generated explanatory illustration of a fictional home and person. It is not a flood photograph or a measure of flood depth.

FEMA’s special flood hazard areas, or SFHAs, help determine mandatory insurance requirements. A commercial risk model answers a different question. GAO classified First Street scores 4–10 as high risk; the classifications are not interchangeable with a FEMA map designation.

The table below preserves three separate categories. Digitally unmapped means no digital FEMA map was available, including places with paper-only maps. It does not mean no one has ever studied their flood risk. Counts include homes and nonresidential properties. [GAO Table 1 and note]

GAO labels Table 1 January 2024. Its methodology dates property characteristics to January 2024 and flood-risk data to March 2025. This is a dated comparison, not a November 2026 property census. Other models can produce different estimates.

How the 86% estimate differs: GAO matched NFIP policy records with modeled property risk and adjusted coverage rates for unmatched contracts. The estimate covers the model-defined high-risk group across map categories. Private property-level coverage was unavailable, so GAO could not measure the share with no insurance of any kind. Do not multiply 86% by Table 1’s total to invent an uninsured-property count. [GAO Figure 1 note; Appendix I, Analysis of Flood Risk and Insurance Coverage]

1. What does the lender require?

Covered lending rules generally require flood insurance for buildings securing designated loans in SFHAs where NFIP coverage is available. A federally regulated lender’s loan can be covered even without a federal loan guarantee. Some lenders also require insurance outside an SFHA. Ask the servicer for the building’s flood determination and the written requirement. Meeting a lending minimum does not establish that every household expense is protected. [Interagency Q&A, Applicability Q1–4; Amount Q7–9]

Paying off the mortgage changes the lending relationship, not the physical hazard. Before dropping a policy, check other obligations, including requirements connected with prior federal disaster assistance. [NFIP eligibility and disaster-assistance conditions]

2. What flood risks affect the property?

Start with the FEMA Flood Map Service Center and record the map date. Ask the local floodplain or emergency-management office about drainage, past flooding and local information the map may not resolve. Development, terrain and weather can change water flow. If risk tools disagree, compare their dates and flood mechanisms rather than treating either as a promise. [NAIC, How can I find out about my flood risk?]

3. What would the insurance actually pay?

Read the declarations, policy form and endorsements together. Ask about covered water sources, insured property, valuation, separate deductibles, exclusions and the policy’s start date. Compare quotes on those terms before comparing price. The FinanceFirst homeowners-insurance guide explains how to organize the documents.

Standard homeowners and renters insurance generally excludes flood damage. NFIP residential building coverage is available up to $250,000, with contents coverage up to $100,000. These are available limits, not guaranteed payments. Building and contents coverage are generally purchased separately. NFIP eligibility normally depends on community participation, including outside SFHAs. Private coverage and state rules can differ. [NFIP buying guidance] [Eligibility]

Deductibles and valuation are separate questions

The NFIP Dwelling Form applies separate building and personal-property deductibles. Its personal-property settlement uses actual cash value, which subtracts physical depreciation. Building replacement-cost settlement has conditions, including qualifying occupancy and insurance-to-value requirements, and can depend on completed repairs. A high contents limit alone does not promise the price of brand-new belongings. [44 CFR Part 61, Appendix A(1), II.C.2, VI and VII.R]

Coverage has boundaries

The NFIP policy does not provide temporary housing or additional living expenses. Basement and below-elevated-floor coverage is restricted; check the specific items and location rather than assuming everything below ground is insured. Private products may offer different terms. Ask for the policy provision supporting the agent’s answer. [NFIP exclusions] [Florida DFS coverage FAQ]

All inputs are invented. Assume $80,000 of building replacement damage, $20,000 of belongings replacement damage and $6,000 of temporary living costs. Building and contents limits are assumed high enough not to bind. No living-cost reimbursement is modeled.

The third setup leaves two $2,000 deductibles plus $6,000 of living costs. Building-only coverage also leaves the belongings loss. Premiums are excluded, so this comparison does not estimate whether a policy is worth buying.

Depreciation can leave a replacement gap

Keep the $106,000 total, but assume the belongings cost $20,000 to replace and have an eligible depreciated value of $12,000. A $2,000 contents deductible leaves a $10,000 contents payment. Add the $78,000 building payment: $106,000 − $88,000 leaves $18,000 for the household to fund.

A large loss can exceed the limit

In a separate invented example, building damage rises to $300,000. Belongings remain $20,000 and living costs $6,000, giving a $326,000 total. With a $250,000 building cap and $2,000 deductibles, the simplified model pays $250,000 for the building and $18,000 for contents. The remaining cost is $58,000.

Actual policy terms may produce a different result. The model does not apply underinsurance provisions, repair-completion conditions, special sublimits, other-insurance clauses, claim disputes, assistance or payment timing. It should not be used to predict a settlement or choose a coverage amount.

Collect the declarations, policy, endorsements, lender determination and an inventory. Request written answers to these questions. They follow the coverage-comparison approach in Texas OPIC’s shopping guide; available products and state protections vary.

1. Requirement and hazard: Which building and loan does the lender’s determination cover, and what local flood information should I check?
2. Covered losses: Which water sources, belongings and basement items qualify? Which exclusions or special limits apply?
3. Payment terms: What separate deductibles and valuation methods apply, and what conditions must be met?
4. Cash needed: What replacement gaps and living costs remain uninsured? Can I fund the deductibles while waiting for a claim payment?
5. Start date and price: When exactly does coverage begin, what is the full annual price including fees, and will the lender accept the proposed policy?

NFIP policies generally have a 30-day waiting period, with exceptions such as qualifying mortgage transactions. Confirm the effective date and any flood-in-progress exclusion before relying on a new policy. Renters should check contents coverage; a landlord’s building policy does not protect their belongings. [NFIP waiting-period guidance] [OPIC renter guidance]

Citation-ready finding: FinanceFirst’s arithmetic from GAO Table 1 places 13,039,240 properties, or 81.3% of its model-defined high-risk group, outside SFHAs or in digitally unmapped areas. Keep the model classification, nonresidential scope and reference dates with the finding. It does not count uninsured homes.

Suggested attribution: “FinanceFirst calculations from GAO-27-108012, Table 1, using First Street model classifications.” Attribute the underlying evidence to GAO. Label the household examples as hypothetical.

• Full GAO aggregate table (CSV) and location shares (CSV)
• Invented scenario inputs (CSV) and all six results (CSV)
• Blank coverage audit (CSV)
• Location chart (SVG) and hypothetical-cost chart (SVG)
• Source register, claim register, methodology and reproduce.py
• Complete research data kit (ZIP): extract it and run python reproduce.py with Python 3. No additional packages or network access are required.

Revision record: Version 1.1, November 11, 2026. Consolidated methodology, clarified the NFIP estimate and settlement assumptions, improved chart accessibility and repaired reproduction instructions. Headline counts, shares and all six modeled dollar results are unchanged. Report a possible error through the corrections process.

What FinanceFirst calculated

We transcribed GAO’s aggregate Table 1 and checked every row and column total. The combined count is 12,797,264 + 241,976 = 13,039,240. Its share is 13,039,240 ÷ 16,029,433 × 100 = 81.3456%, shown as 81.3%. Keeping only the mapped-outside group in the numerator gives 79.8% of the same denominator. This sensitivity does not test a different flood model.

What the evidence cannot establish

We did not obtain First Street’s proprietary property records, reproduce its risk model, inspect homes or conduct interviews. The counts are model-derived properties, including residential and nonresidential, not current households. Model uncertainty remains even though the arithmetic uses integer counts. We have not constructed confidence intervals.

The NFIP coverage estimate is GAO’s rounded finding, not a FinanceFirst calculation. GAO’s Figure 1 note reports a 79.2% contract match rate and adjustment for unmatched contracts; Appendix I explains the matching stages and limitations. Private property-level coverage was unavailable. Different reference dates and incomplete coverage information prevent a current count of wholly uninsured households.

How the invented loss model works

For each insured category: payment = min(limit, max(eligible adjusted loss − deductible, 0)). Remaining cost = building replacement damage + belongings replacement damage + living costs − modeled payments. Replacement bills and eligible insured values are separate inputs. The formula is an educational simplification, not a complete implementation of the NFIP Dwelling Form or a private contract. See the exclusions next to the examples and the downloadable assumptions.

Review status

This report was prepared with AI assistance. No qualified human insurance or legal review has been recorded. The claims still requiring that review are the application of lending exceptions and prior-assistance obligations, and the interpretation of actual policy valuation, deductibles, exclusions and loss-settlement conditions. Code verification establishes arithmetic consistency, not how an insurer would settle a claim.