6,200 flood insurance claims·$184.8M paid·12 federal flood & hurricane disasters
Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.
Shaded areas are FEMA’s mapped flood hazard zones in and around Montgomery County, Pennsylvania. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.
Flash flooding from severe summer thunderstorms dominates the flood profile of Montgomery County, Pennsylvania, accounting for 192 recorded events and 9 deaths over the last 30 years, alongside 71 general flood events and 2 tropical storms.
Recent localized events illustrate this pattern, including heavy rain from a slow-moving cold front in July 2025 that caused flash flooding across the region over consecutive days, as well as additional flash flooding sparked by an approaching cold front later in July 2025.
Homeowners, real estate agents, and journalists should note that flood risk extends well beyond designated high-risk areas. While FEMA National Flood Insurance Program records show the highest concentration of claims in Zone A with 3,817 claims averaging an 11-inch water depth and $41,974 payouts, significant impacts also occur outside designated high-risk zones. Zone X properties recorded 1,566 claims with an average 10-inch water depth and $32,131 payouts, while shaded and unshaded Zone X designations accounted for another 610 claims with average water depths of 6 to 7 inches. Properties outside traditional high-risk zones still experience damaging water accumulation and should maintain appropriate flood awareness.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
14% of Montgomery County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.
4,432 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.
In flood insurance claims here that reported a flood depth, the average was 10 inches.
Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.
Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.
The worst year was 2011, with 811 claims and $25.2M paid, the year of Hurricane Irene, Tropical Storm Lee and Remnants Of Tropical Storm Lee.
Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.
40 NOAA storm reports from Montgomery County describe what happened, in the words of the forecasters who covered it. Read the Pennsylvania flood stories →
29 federal disaster declarations since 1965, 12 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Remnants Of Hurricane Ida | Aug 31, 2021 |
| Severe Winter Storm And Snowstorm | Jan 22, 2016 |
| Severe Winter Storm | Feb 4, 2014 |
| Hurricane Sandy | Oct 26, 2012 |
| Remnants Of Tropical Storm Lee | Sep 3, 2011 |
| Tropical Storm Lee | Sep 3, 2011 |
| Hurricane Irene | Aug 26, 2011 |
| Severe Winter Storms And Snowstorms | Feb 5, 2010 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
265 since 1996: 192 flash floods and 71 river or area floods.
| Event | Date | Damage |
|---|---|---|
| Flash Flood | May 31, 2025 | — |
| Flash Flood | Jul 31, 2025 | $25,000 |
| Flash Flood | Jul 31, 2025 | $30,000 |
| Flash Flood | May 16, 2025 | — |
| Flash Flood | Jul 14, 2025 | — |
| Flash Flood | Jul 9, 2025 | — |
| Flash Flood | Jul 1, 2025 | — |
| Flood | Jan 10, 2024 | — |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Flash Flood · May 31, 2025. Thunderstorms, in the vicinity a cold front, produced flash flooding.
Flash Flood · Jul 31, 2025. A stationary front sparked off showers and thunderstorms across the forecast area. Flash flooding resulted.
Flash Flood · May 16, 2025. Scattered thunderstorms developed along a slow moving warm front.
Flash Flood · Jul 14, 2025. An approaching cold front sparked off showers and thunderstorms across the forecast area. Flash flooding resulted.
National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.
Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.
If a building in Montgomery County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.
Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.