Flood events in Mercer County, New Jersey The flood events on record, by date and by year
This page is a county record of past events and claims. It does not show the flood zone or the risk of an address. For the flood map of an address, use FEMA's address search (opens in a new tab).
NCEI has 137 flood events on record for Mercer County, New Jersey, from 1996 through 30 Jun 2026.
The newest flood event on record is on 22 Jun 2026.
From 2016 through 2025, NCEI has 46 flood events on record for the county.
The NWS collects event reports from a variety of sources, which include (but are not limited to): county, state, and federal emergency management officials, local law enforcement officials, SKYWARN spotters, NWS damage surveys, newspaper clipping services, the insurance industry, and the general public, among others.
The National Weather Service reports property and crop damage estimates using available data at the time of event reporting. These values should therefore be considered broad estimates. Damage amounts are not adjusted for inflation.
Zone (NWS Forecast Zone): A zone is a geographic area defined by the NWS for issuing forecasts, watches, and warnings. While zones often align with counties, they can also represent smaller or subdivided areas within a county to account for differences in weather conditions, such as elevation or proximity to water. Larger-scale events—such as heat, cold, drought, and winter storms—are typically recorded by zone.
The words of the agency. Source: NOAA NCEI, Storm Events Database, page "Frequently Asked Questions", copied on .
Date of the data: NCEI storm events through . Event types on this page: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
Newest flood events on record
Flash Flood
1 mile NNW of HAMILTON SQUARE
Flash Flood
1 mile E of EWING TOWNSHIP. Damage estimate: $40 thousand
Flash Flood
1 mile W of PENNINGTON
Coastal Flood
On record for the forecast zone
Coastal Flood
On record for the forecast zone
Coastal Flood
On record for the forecast zone
Flash Flood
1 mile W of PENNINGTON
Flash Flood
1 mile WSW of SOMERSET
Coastal Flood
On record for the forecast zone
Coastal Flood
On record for the forecast zone
Flash Flood
At PENNS NECK
Flash Flood
At PENNS NECK
Coastal Flood
On record for the forecast zone
Flash Flood
2 miles WNW of TITUSVILLE. Damage estimate: $51 million
Coastal Flood
On record for the forecast zone
Flash Flood
2 miles NNW of WINDSOR
Flash Flood
1 mile W of TRENTON
Flash Flood
1 mile W of GROVERS MILLS
Flash Flood
2 miles E of EDINBURG
Flash Flood
2 miles NNE of MERCERVILLE
Flash Flood
1 mile ENE of ROSEDALE
Flash Flood
1 mile ENE of EAST WINDSOR
Flash Flood
1 mile SSW of HARBOURTON
Flash Flood
At SOMERSET
Flash Flood
1 mile W of PRINCETON
A place is the text of the NCEI record: a distance and a direction from a reference place. The site does not show a place text that names a private property or reads as a person. NCEI gives no magnitude for this hazard.
Flood events by year
| Decade | Year that ends in 0 | Year that ends in 1 | Year that ends in 2 | Year that ends in 3 | Year that ends in 4 | Year that ends in 5 | Year that ends in 6 | Year that ends in 7 | Year that ends in 8 | Year that ends in 9 | All |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1950s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1960s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1970s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1980s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1990s | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 1 | 5 | 4 | 26 |
| 2000s | 2 | 3 | 1 | 9 | 6 | 7 | 2 | 3 | 1 | 5 | 39 |
| 2010s | 4 | 7 | 3 | 7 | 3 | 1 | 6 | 1 | 14 | 0 | 46 |
| 2020s | 2 | 15 | 1 | 3 | 4 | 0 | 1 (part of the year) | 26 |
A darker cell has a larger count. The number is in each cell.
Flood and flash flood events are on record from 1996. The year 2026 has the events through 30 Jun 2026 only.
By month, all years
- Jan9 events
- Feb4 events
- Mar9 events
- Apr9 events
- May13 events
- Jun13 events
- Jul21 events
- Aug21 events
- Sep13 events
- Oct10 events
- Nov4 events
- Dec11 events
Beside the other counties
| Measure | Mercer | All counties of New Jersey | All counties of the United States |
|---|---|---|---|
| Flood events, 1996 to 2026 | 137 | 3,014 | 177,902 |
| Events for each 100 square miles | 61.0 | 41.0 | 5.0 |
| Events for each 10,000 residents | 3.6 | 3.3 | 5.4 |
The columns for the state and the United States total the counties. They count the events of each county in the same way as the county column. A forecast zone with another name than a county counts for the state only.
More flood events on record
| Date | Event type | Magnitude | Damage estimate | Deaths | Injuries | On record for |
|---|---|---|---|---|---|---|
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Coastal Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Coastal Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Coastal Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | $1.0 million | 0 | 0 | County | |
| Flash Flood | not recorded | $1.0 million | 0 | 0 | County | |
| Flash Flood | not recorded | $1.0 million | 0 | 0 | County | |
| Flood | not recorded | $10 | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Coastal Flood | not recorded | $1.0 million | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $2.0 million | 0 | 0 | County | |
| Flood | not recorded | $75 million | 2 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | $250 thousand | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $5.0 million | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $8.5 million | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $5.0 million | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | $2.4 million | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | $32 million | 0 | 5 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 1 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | $8.0 million | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flash Flood | not recorded | none | 0 | 0 | County | |
| Flood | not recorded | none | 0 | 0 | Forecast zone |
The table has all other events on record. A damage figure is an estimate in the NCEI record.
Official channels
- NCEI Storm Events Database (opens in a new tab)Search the full NCEI record by state, county and date.
- National Weather Service: Philadelphia/Mt Holly (opens in a new tab)The forecast office that issues the weather warnings for the county.
- FEMA Flood Map Service Center: Search By Address (opens in a new tab)Search an address to see its flood map. This site has no flood-zone data.
These links open the pages of the agencies. The site checked the links on .
Cite this page
County Hazards. "Flood events on record for Mercer County, New Jersey". https://countyhazards.com/county/nj/mercer/flood/. Data: NOAA NCEI Storm Events Database through 30 Jun 2026. Page made on .
Questions
- Which month has the most flood events on record for Mercer County?
- July has 21 of the 137 flood events on record from 1996 through 30 Jun 2026.
- How many flood events are on record for New Jersey?
- NCEI has 3,787 flood events on record for New Jersey from 1996 through 30 Jun 2026. That count has every forecast zone of the state.
- How does Mercer County compare with the other counties of New Jersey?
- The counties of New Jersey have 41.0 flood events for each 100 square miles. Mercer County has 61.0.
- Why are some flood events on record for a forecast zone?
- NCEI records some event types for a National Weather Service forecast zone and not for a county. This page counts a zone event when the zone has the name of the county.