Updated May 2026
Flood Risk in New Haven, CT
New Haven, CT has a Flood Risk Score of 18/100 (Grade A), ranking #320 of 3,277 counties nationwide. The risk level is Low. There have been 45 NFIP flood-insurance claims totaling $1,145,348 in payouts, with 14 federal disaster declarations on record.
Key Data
What the Grade Means Here
New Haven sits in the lowest-risk tier in the FEMA dataset — composite score 18, ranked #320 of 3,277 counties (where #1 is the riskiest). The county has logged 45 NFIP flood-insurance claims and 14 federal flood-related disaster declarations to date. An A grade does not mean zero risk: flash floods, sewer backups, and rare extreme storms can still cause loss, and FEMA reports more than 25% of all NFIP payouts originate from properties outside Special Flood Hazard Areas.
Within Connecticut, New Haven carries flood risk roughly typical of the state, where the average composite score is 17. The county ranks #4 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 73). For New Haven, 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 of 73 of 100 indicates flood-loss volume has been climbing in this county relative to its own history. That can reflect either climate-driven shifts in precipitation patterns, new development extending into flood-prone areas, or both.
Score Breakdown
| Factor | Score | Weight |
|---|---|---|
| Claims Density | 0 | 40% |
| Disaster Frequency | 30 | 25% |
| Claim Severity | 0 | 20% |
| Year-over-Year Trend | 73 | 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 Haven, CT?
New Haven, CT has a Flood Risk Score of 18/100 (Grade A), ranking #320 of 3,277 counties nationwide. The risk level is Low. There have been 45 NFIP flood-insurance claims totaling $1,145,348 in payouts, with 14 federal disaster declarations on record.
Is flood insurance required in New Haven?
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 Haven's county-wide composite score is 18 (Grade A), 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 Haven?
The single biggest driver of the composite score in this county is year-over-year trend (15% of the formula, factor score 73). For New Haven, 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 Haven?
The trend factor of 73 of 100 indicates flood-loss volume has been climbing in this county relative to its own history. That can reflect either climate-driven shifts in precipitation patterns, new development extending into flood-prone areas, or both.
How does New Haven compare to other counties in Connecticut?
Within Connecticut, New Haven carries flood risk roughly typical of the state, where the average composite score is 17. The county ranks #4 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 Haven, CT has a Flood Risk Score of 18/100 (Grade A), ranking #320 of 3,277 counties nationwide. The risk level is Low. There have been 45 NFIP flood-insurance claims totaling $1,145,348 in payouts, with 14 federal disaster declarations on record.
The data source behind this answer is FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims. Every figure on the page traces back to that source; the methodology page describes the inputs and the refresh cadence in full detail.
A practical caveat: the headline answer above reflects the most recent FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims vintage; underlying data is often revised for months after first publication, and the right reference for any specific decision is whichever vintage is current at the time of the decision. The as-of date is stamped on every page.