Connecticut landslide risk
Western Connecticut Planning Region has the highest landslide risk in Connecticut, scoring 89 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Western Connecticut Planning Region | 89 | Relatively Moderate | 0 |
| 2 | Capitol Planning Region | 87.2 | Relatively Moderate | 0 |
| 3 | Naugatuck Valley Planning Region | 86.8 | Relatively Low | 0 |
| 4 | Northwest Hills Planning Region | 82.8 | Relatively Low | 0 |
| 5 | Southeastern Connecticut Planning Region | 76.7 | Relatively Low | 0 |
| 6 | Lower Connecticut River Valley Planning Region | 72.5 | Relatively Low | 0 |
| 7 | South Central Connecticut Planning Region | 69.2 | Relatively Low | 0 |
| 8 | Northeastern Connecticut Planning Region | 62.2 | Very Low | 0 |
| 9 | Greater Bridgeport Planning Region | 46.5 | Very Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Landslide risk nationally:
Other hazard risks in Connecticut:
Frequently asked questions
What is the highest landslide risk county in Connecticut?
Western Connecticut Planning Region, CT has the highest landslide risk in Connecticut, with a FEMA National Risk Index score of 89 out of 100 (rated "Relatively Moderate").
What causes landslide risk in Connecticut?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.