Naugatuck Valley Planning Region, Connecticut Natural Disaster Risk
FEMA National Risk Index assessment · CT
MediumComposite Risk Score
National percentile: 93th
Naugatuck Valley Planning Region faces medium composite natural disaster risk (NRI Risk Index score 93.2, 93th national percentile), driven primarily by riverine flood and hurricane exposure. Expected annual loss across all 18 hazard types is $140M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Overall natural disaster risk in Naugatuck Valley Planning Region is medium, with a National Risk Index score of 93.2 out of 100 — placing it in the 93rd national percentile and near the national midpoint for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Risk here concentrates in riverine flood (rivers and streams overflowing their banks after heavy rain or snowmelt) at High risk — $101M in expected annual loss and about 3.54 events per year; hurricane (tropical cyclones bringing extreme wind, rain, and storm surge) at High risk — $24M in expected annual loss and about 0.15 events per year; and ice storm (freezing rain that coats surfaces in heavy, damaging ice) at High risk — $2M in expected annual loss and about 2.17 events per year. Across all hazards, FEMA estimates $140M in expected annual loss for a population of 450K.
Beyond physical exposure, Naugatuck Valley Planning Region has a low social vulnerability rating (how susceptible the population is to harm) and a high community resilience rating (its capacity to prepare for and recover from disasters). A less vulnerable population paired with strong resilience helps the community absorb and recover from events.
Among 9 Connecticut counties, Naugatuck Valley Planning Region ranks #4 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Riverine Flood | High | 3.54 / yr | $101M |
| Hurricane | High | 0.15 / yr | $24M |
| Ice Storm | High | 2.17 / yr | $2M |
| Strong Wind | High | 3.71 / yr | $2M |
| Winter Weather | High | 15.15 / yr | $364K |
| Landslide | Low | 0.65 / yr | $39K |
| Earthquake | Low | 0.00 / yr | $3M |
| Lightning | High | 27.30 / yr | $1M |
| Heat Wave | Medium | 5.48 / yr | $2M |
| Tornado | Medium | 0.13 / yr | $3M |
| Cold Wave | Medium | 1.39 / yr | $2M |
| Hail | Low | 2.52 / yr | $326K |
| Drought | Low | 3.85 / yr | $153K |
| Wildfire | Very Low | 0.00 / yr | $43K |
| Coastal Flood | Very Low | 6.16 / yr | $27K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
FEMA's declaration records (1953–present) list no county-level federal disaster declarations for Naugatuck Valley Planning Region. Statewide emergency declarations may still have applied.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Naugatuck Valley Planning Region?
Naugatuck Valley Planning Region has a composite FEMA National Risk Index score of 93.2 out of 100, placing it in the Medium category and the 93th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Naugatuck Valley Planning Region?
The three highest-rated hazards are Riverine Flood (High, $101M EAL), Hurricane (High, $24M EAL), Ice Storm (High, $2M EAL). These account for most of the county's expected annual losses.
How does Naugatuck Valley Planning Region compare to other Connecticut counties?
Naugatuck Valley Planning Region ranks #4 of 9 Connecticut counties for overall natural disaster risk, with a medium rating.
How many federally declared disasters has Naugatuck Valley Planning Region had?
FEMA's declaration records (1953–present) list no county-level major disaster declarations for Naugatuck Valley Planning Region. Statewide emergency declarations may still have applied.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Naugatuck Valley Planning Region's $140M EAL is a statistical average, not a guarantee for any specific year or address.