Connecticut inland flooding risk
Capitol Planning Region has the highest inland flooding risk in Connecticut, scoring 99 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Capitol Planning Region | 99 | Relatively High | 0 |
| 2 | Western Connecticut Planning Region | 98.1 | Relatively High | 0 |
| 3 | South Central Connecticut Planning Region | 96.9 | Relatively High | 0 |
| 4 | Naugatuck Valley Planning Region | 96.3 | Relatively High | 0 |
| 5 | Greater Bridgeport Planning Region | 93.9 | Relatively High | 0 |
| 6 | Southeastern Connecticut Planning Region | 91.8 | Relatively Moderate | 0 |
| 7 | Lower Connecticut River Valley Planning Region | 90.3 | Relatively Moderate | 0 |
| 8 | Northwest Hills Planning Region | 88 | Relatively Moderate | 0 |
| 9 | Northeastern Connecticut Planning Region | 75.2 | Relatively Moderate | 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.
Inland Flooding risk nationally:
Other hazard risks in Connecticut:
Frequently asked questions
What is the highest inland flooding risk county in Connecticut?
Capitol Planning Region, CT has the highest inland flooding risk in Connecticut, with a FEMA National Risk Index score of 99 out of 100 (rated "Relatively High").
What causes inland flooding risk in Connecticut?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.