2,185
Recorded events
67
Counties affected
29
Direct deaths
$837.4M
Property damage
Pennsylvania flood history: 2,185 recorded events across 67 counties between 1996 and 2026.
Decade by decade
Pennsylvania flood history by decade
The 2010s are the busiest decade on record with 939 reported flood events across Pennsylvania. 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 flood events in Pennsylvania
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Allegheny County | 99 | 0 | $883K | 2007–2021 |
| #2 | Westmoreland County | 84 | 0 | $550K | 2007–2024 |
| #3 | Philadelphia County | 74 | 0 | $3.2M | 1997–2024 |
| #4 | Chester County | 67 | 0 | $9.7M | 1998–2025 |
| #5 | Montgomery County | 67 | 3 | $24.9M | 1997–2024 |
| #6 | Bucks County | 52 | 0 | $32.2M | 1998–2025 |
| #7 | Washington County | 52 | 0 | $877K | 2007–2024 |
| #8 | Beaver County | 51 | 0 | $1.9M | 2006–2024 |
| #9 | Jefferson County | 51 | 0 | $3.3M | 2007–2020 |
| #10 | Delaware County | 49 | 0 | $8.1M | 1998–2023 |
| #11 | Berks County | 45 | 0 | $17.8M | 2006–2023 |
| #12 | Fayette County | 38 | 0 | $543K | 2007–2024 |
| #13 | Greene County | 30 | 0 | $72K | 2007–2024 |
| #14 | Lancaster County | 29 | 4 | $810K | 2006–2025 |
| #15 | Northampton County | 28 | 0 | $12.5M | 2006–2017 |
| #16 | Butler County | 28 | 0 | $5.3M | 2008–2024 |
| #17 | Lawrence County | 26 | 0 | $331K | 2008–2026 |
| #18 | York County | 25 | 0 | $4.7M | 2006–2026 |
| #19 | Indiana County | 24 | 0 | $243K | 2008–2023 |
| #20 | Venango County | 22 | 0 | $348K | 2007–2017 |
| #21 | Lehigh County | 21 | 0 | $1.5M | 2006–2023 |
| #22 | Armstrong County | 20 | 0 | $164K | 2010–2026 |
| #23 | Cumberland County | 19 | 0 | $1.0M | 2006–2024 |
| #24 | Luzerne County | 18 | 0 | $54.1M | 1999–2025 |
| #25 | Mercer County | 18 | 0 | $191K | 2007–2022 |
Significant events
Deadliest flood events in Pennsylvania
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Sep 7, 2011 | Dauphin County | — | 4 | 0 |
| Sep 7, 2011 | Lancaster County | — | 3 | 0 |
| Jun 27, 2006 | Monroe County | — | 2 | 0 |
| Sep 7, 2011 | Lebanon County | — | 1 | 0 |
| Jul 23, 2018 | Adams County | — | 1 | 0 |
| Sep 2, 2006 | Montgomery County | — | 1 | 0 |
| Sep 7, 2011 | Bradford County | — | 1 | 0 |
| Oct 1, 2010 | Montgomery County | — | 1 | 0 |
| Aug 28, 2011 | Montgomery County | — | 1 | 0 |
| Jul 24, 2018 | Dauphin County | — | 1 | 0 |