Earthquake Risk in Connecticut
All Connecticut counties ranked by FEMA National Risk Index earthquake score
Earthquake risk — ground shaking from sudden movement along geologic faults — is rated for 9 of 9 Connecticut counties in FEMA's National Risk Index. Capitol Planning Region carries the state's highest earthquake score at 93.5, with $11M in expected annual earthquake losses.
No Connecticut county reaches the High band for earthquake, and expected annual losses from earthquake total roughly $37M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Earthquake
| # | County | Earthquake Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Capitol Planning Region | Medium | 0.00 / yr | $11M | |
| 2 | Western Connecticut Planning Region | Medium | 0.00 / yr | $8M | |
| 3 | South Central Connecticut Planning Region | Medium | 0.00 / yr | $7M | |
| 4 | Greater Bridgeport Planning Region | Low | 0.00 / yr | $3M | |
| 5 | Naugatuck Valley Planning Region | Low | 0.00 / yr | $3M | |
| 6 | Southeastern Connecticut Planning Region | Low | 0.00 / yr | $2M | |
| 7 | Lower Connecticut River Valley Planning Region | Low | 0.00 / yr | $1M | |
| 8 | Northwest Hills Planning Region | Low | 0.00 / yr | $840K | |
| 9 | Northeastern Connecticut Planning Region | Low | 0.00 / yr | $711K |
9 Connecticut counties with measurable earthquake risk. See the national earthquake ranking or all Connecticut counties by overall risk.
Frequently Asked Questions
Which Connecticut county has the highest earthquake risk?
Capitol Planning Region has the highest FEMA earthquake risk score in Connecticut at 93.5 (Medium), with $11M in expected annual losses and about 0.00 events per year.
How many Connecticut counties face significant earthquake risk?
9 Connecticut counties record measurable earthquake risk in FEMA's National Risk Index; 0 of them are rated High or Very High.