---
title: "Flood risk in mortgage lending (research idea)"
description: "Climate risk is one of the most frequent keywords in the finance journals, yet only 5 of 82 recent mortgage papers carry a flood, climate-risk or disaster keyword. Do lenders price flood risk into mortgages, and do they pass the riskiest loans to government-backed buyers?"
url: https://scholar4ai.com/ideas/flood-risk-in-mortgage-lending
markdown_url: https://scholar4ai.com/ideas/flood-risk-in-mortgage-lending.md
license: CC BY-NC 4.0 (https://creativecommons.org/licenses/by-nc/4.0/)
share_text: "Flood risk in mortgage lending (research idea): Climate risk is one of the most frequent keywords in the finance journals, yet only 5 of 82 recent mortgage papers carry a flood, climate-risk or disaster keyword."
date: "2026-10-23"
updated: "2026-10-23"
status: "seed"
tags: ["finance", "banking", "climate"]
keywords: ["mortgage lending", "flood risk", "climate risk"]
---

# Flood risk in mortgage lending

Climate risk is one of the most frequent keywords in the finance journals, yet only 5 of 82 recent mortgage papers carry a flood, climate-risk or disaster keyword. Do lenders price flood risk into mortgages, and do they pass the riskiest loans to government-backed buyers?

## What prompted this

Since October 2025, 82 papers carry a mortgage keyword (54 in finance journals, 26 in economics), and only 5 of them also carry a flood, climate-risk, physical-risk, wildfire or natural-disaster keyword. "Climate risk" alone appears on 242 papers, so the two literatures exist side by side without meeting.

## Questions

- Do mortgages on homes in flood zones carry higher rates or lower loan-to-value ratios, after controlling for borrower risk?
- Do lenders keep low-risk loans and sell flood-exposed ones to Fannie Mae and Freddie Mac, shifting the risk to taxpayers?
- When flood maps are updated, do lending and house prices in newly mapped areas change?

## Data that could help

Loan-level mortgage data (HMDA, Fannie Mae and Freddie Mac loan files), flood zone maps and their revision dates, and house transaction records (CoreLogic, Zillow).

## Next step

Compare the share of mortgages sold to the government-sponsored enterprises inside and outside flood zones, before and after a flood map update in one state.

## Related research activity

*The keywords this note follows, in the tracked finance, accounting, economics, management, operations research and AI journals as of 2026-10-26*

| Keyword | Papers, last 30 days | Rank | Papers per month, Oct 23 – Oct 26* | Papers, last 36 months |
|---|---:|---:|---|---:|
| mortgage lending | 1 | #2881 | 0, 4, 0, 2, 2, 1, 2, 2, 0, 2, 1, 1, 4, 0, 3, 3, 1, 4, 5, 2, 1, 2, 1, 0, 1, 1, 1, 2, 0, 1, 1, 3, 2, 4, 2, 1, 1 | 62 |
| flood risk | 1 | #2881 | 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 1, 1, 2, 1, 0, 2, 0, 3, 0, 1, 1, 2, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 2, 1, 0, 0, 1 | 23 |
| climate risk | 15 | #57 | 9, 13, 6, 9, 11, 11, 13, 9, 7, 10, 14, 14, 11, 20, 22, 10, 20, 22, 14, 23, 21, 16, 17, 12, 24, 26, 18, 16, 23, 14, 24, 17, 25, 17, 10, 22, 12 | 570 |

## Cite this page

Scholar4AI. (2026). Flood risk in mortgage lending. Journal Research Rankings. Retrieved October 23, 2026, from https://scholar4ai.com/ideas/flood-risk-in-mortgage-lending

```bibtex
@misc{scholar4ai-ideas-flood-risk-in-mortgage-lending,
  author = {{Scholar4AI}},
  title = {Flood risk in mortgage lending},
  year = {2026},
  howpublished = {\url{https://scholar4ai.com/ideas/flood-risk-in-mortgage-lending}},
  urldate = {2026-10-23},
  note = {Journal Research Rankings; data from OpenAlex (CC0); licensed CC BY-NC 4.0}
}
```

License: CC BY-NC 4.0 (https://creativecommons.org/licenses/by-nc/4.0/).