Connecticut coastal flooding risk
Greater Bridgeport Planning Region has the highest coastal flooding risk in Connecticut, scoring 94.8 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Greater Bridgeport Planning Region | 94.8 | Very High |
| 2 | South Central Connecticut Planning Region | 93.8 | Relatively High |
| 3 | Western Connecticut Planning Region | 89.8 | Relatively High |
| 4 | Lower Connecticut River Valley Planning Region | 79.6 | Relatively Moderate |
| 5 | Southeastern Connecticut Planning Region | 71.2 | Relatively Moderate |
| 6 | Naugatuck Valley Planning Region | 42.2 | Very Low |
| 7 | Capitol Planning Region | 38.4 | Very Low |
| 8 | Northeastern Connecticut Planning Region | 0 | No Rating |
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.
Coastal Flooding risk nationally:
Other hazard risks in Connecticut:
Frequently asked questions
What is the highest coastal flooding risk county in Connecticut?
Greater Bridgeport Planning Region, CT has the highest coastal flooding risk in Connecticut, with a FEMA National Risk Index score of 94.8 out of 100 (rated "Very High").
How many counties in Connecticut are rated Very High for coastal flooding risk?
1 of 8 scored Connecticut counties are rated "Very High" for coastal flooding risk by FEMA's National Risk Index.
What causes coastal flooding risk in Connecticut?
Coastal flooding scores cover storm surge, wave action, and tidal flooding along the Gulf, Atlantic, and Pacific coasts, and Great Lakes shoreline. Inland flooding is scored separately. Counties with "Not Applicable" ratings have no significant coastal exposure. Coastal flood events are reported at zone level in NOAA Storm Events and are not included in county-level counts.