Storms, floods and disasters in Mercerville
Mercerville isn’t graded for hazard risk: Mercerville is a Census area inside a town, graded with the town. Flood insurance has paid 55 claims here since 1978.
What Mercerville faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
River and rain flooding
Hurricanes
Strong wind
Earthquakes
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
Does Mercerville flood? Sometimes: 55 flood claims since 1978
Every paid claim on a federal flood insurance policy in Mercerville, from FEMA’s records.
- Hurricane Irene20 claims · $1.4M
- Hurricane Floyd9 claims · $55K
- The April 2007 nor’easter7 claims · $38K
Mercerville isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Mercer County.The storms Mercerville remembers
None of the 20 disasters declared for Mercer County shows FEMA aid or repair money reaching Mercerville itself in FEMA’s records, so these are its biggest flood-claim years.
- 201120 flood claims paidThe year of Remnants of Tropical Storm Lee, declared for Mercer County
- 19999 flood claims paidThe year of Hurricane Floyd Major Disaster Declarations, declared for Mercer County
- 19797 flood claims paidNo declaration for the county that year
Mercer County has had 20 natural disasters declared by the President since 1953, most often severe storms, then hurricanes and tropical storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees; the 2001 World Trade Center declarations.
Old photos of Mercerville after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Mercerville archive →Mercerville and its neighbors
How expected damage per building compares across the town line. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Hamilton Square | — | a Census area inside a town; graded with the town | |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Mercerville faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- The season runs June through November and peaks from mid-August to mid-October.
- Bring in porch furniture and anything the wind can throw.
- Fill the gas tank and charge phones before the storm arrives.
- Trim dead limbs over the house and driveway.
- Tie down trash cans and outdoor furniture.
- Stay clear of downed lines and call the utility.
- Drop, cover and hold on.
- Strap tall furniture and the water heater to the wall.
- Know how to shut off the gas.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Mercerville
Does Mercerville flood?
Flood insurance has paid 55 claims in Mercerville since 1978, $1.9M in all. The most claims came from Hurricane Irene (20).
Is Mercerville in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Mercer County, 42% of homes in mapped flood zones carry federal flood insurance, and 1.2% of all homes do.
How much is flood insurance in Mercerville?
FEMA’s Community Rating System list shows no discount for Mercerville’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Mercerville?
By flood claims, Hurricane Irene: 20 paid, $1.4M.
Storm stories
Memories, warnings and help from neighbors in Mercerville.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Mercerville’s residents lived in the 2020 census; OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.