Updated May 2026
Flood Risk in New London, CT
New London, CT has a Flood Risk Score of 21/100 (Grade B), ranking #138 of 3,277 counties nationwide. The risk level is Moderate. There have been 17 NFIP flood-insurance claims totaling $520,780 in payouts, with 12 federal disaster declarations on record.
Key Data
What the Grade Means Here
New London carries a B grade — modest but non-trivial flood risk. With a composite score of 21 and 17 NFIP claims on file, the county sits in the second-safest tier of the U.S. distribution (rank #138 of 3,277). Most insured loss here clusters in localized low-elevation neighborhoods or river-adjacent corridors rather than across the whole county.
Within Connecticut, New London carries flood risk roughly typical of the state, where the average composite score is 17. The county ranks #2 of 9 state-internally. The full Connecticut state profile shows how every county within the state compares.
What's Driving the Risk Score?
The single biggest driver of the composite score in this county is year-over-year trend (15% of the formula, factor score 98). For New London, that means the year-over-year trend in flood losses is contributing meaningfully — this is a county where loss has been climbing in recent years, not just historically high.
The trend factor is high (98 of 100), meaning flood losses have been accelerating sharply in this county. That is the single most actionable signal in the score — recent risk is meaningfully greater than the long-run average suggests.
Score Breakdown
| Factor | Score | Weight |
|---|---|---|
| Claims Density | 0 | 40% |
| Disaster Frequency | 26 | 25% |
| Claim Severity | 0 | 20% |
| Year-over-Year Trend | 98 | 15% |
How This Score Is Calculated
The composite is a weighted average of four FEMA-derived factors. Source data comes from the public FEMA flood-mapping program via the OpenFEMA API. For property-level decisions, layer this with the parcel's FEMA Flood Insurance Rate Map zone and recent crest readings from USGS Water Data. Full math: methodology page.
Frequently Asked Questions
What is the flood risk in New London, CT?
New London, CT has a Flood Risk Score of 21/100 (Grade B), ranking #138 of 3,277 counties nationwide. The risk level is Moderate. There have been 17 NFIP flood-insurance claims totaling $520,780 in payouts, with 12 federal disaster declarations on record.
Is flood insurance required in New London?
Federal law requires flood insurance for any property in a Special Flood Hazard Area (FEMA Zone A or V) financed by a federally regulated lender. New London's county-wide composite score is 21 (Grade B), which is a county aggregate — your specific parcel's flood-zone designation comes from the FEMA Flood Insurance Rate Map (FIRM) at fema.gov/flood-maps. Even when not legally required, NFIP coverage is often available for a few hundred dollars a year in moderate- and low-risk zones, and FEMA reports more than 25% of all NFIP claims come from outside high-risk zones.
What is driving the flood risk score in New London?
The single biggest driver of the composite score in this county is year-over-year trend (15% of the formula, factor score 98). For New London, that means the year-over-year trend in flood losses is contributing meaningfully — this is a county where loss has been climbing in recent years, not just historically high.
Is flood risk increasing or decreasing in New London?
The trend factor is high (98 of 100), meaning flood losses have been accelerating sharply in this county. That is the single most actionable signal in the score — recent risk is meaningfully greater than the long-run average suggests.
How does New London compare to other counties in Connecticut?
Within Connecticut, New London carries flood risk roughly typical of the state, where the average composite score is 17. The county ranks #2 of 9 state-internally.
Where does this data come from?
Every figure on this page comes from FEMA's public OpenFEMA API — the DisasterDeclarationsSummaries v2 endpoint (federally declared flood-related disasters) and the FimaNfipClaims endpoint (individual NFIP flood-insurance claims aggregated by county FIPS code). Both are public-domain U.S. government work. Real-time stream-gauge readings that complement these federal aggregates live at USGS Water Data. Last updated 2026-05-16.
New London, CT has a Flood Risk Score of 21/100 (Grade B), ranking #138 of 3,277 counties nationwide. The risk level is Moderate. There have been 17 NFIP flood-insurance claims totaling $520,780 in payouts, with 12 federal disaster declarations on record.
This answer pulls from FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims, the authoritative federal source for U.S. flood risk, NFIP claims, and disaster declarations. The headline number above is the direct answer; what follows is the additional context most readers need to use the answer for a real decision rather than just a fact lookup.
For readers turning this answer into action: cross-reference against the underlying FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims record before acting on time-sensitive decisions. The site renders the data as it was published; subsequent revisions can shift the picture, and the live federal data is always the authoritative current reference.