619
Recorded events
8
Counties affected
5
Direct deaths
$24.4M
Property damage
Connecticut flash flood history: 619 recorded events across 8 counties between 1996 and 2025.
Decade by decade
Connecticut flash flood history by decade
The 2020s are the busiest decade on record with 242 reported flash flood events across Connecticut. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most flash flood events in Connecticut
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Fairfield County | 169 | 2 | $14.8M | 1996–2025 |
| #2 | New Haven County | 133 | 3 | $3.5M | 1996–2025 |
| #3 | Hartford County | 92 | 0 | $1.9M | 1996–2025 |
| #4 | Litchfield County | 91 | 0 | $2.7M | 1996–2024 |
| #5 | New London County | 81 | 0 | $806K | 1996–2024 |
| #6 | Middlesex County | 26 | 0 | $300K | 1996–2023 |
| #7 | Windham County | 19 | 0 | $168K | 1998–2024 |
| #8 | Tolland County | 7 | 0 | $115K | 2000–2023 |
Significant events
Deadliest flash flood events in Connecticut
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Aug 18, 2024 | New Haven County | — | 2 | 0 |
| Sep 6, 2008 | Fairfield County | — | 1 | 0 |
| Aug 18, 2024 | Fairfield County | — | 1 | 0 |
| Sep 16, 1999 | New Haven County | — | 1 | 0 |