Photo: Unknown photographer · Public domainMore hazard damage per building is expected in Hahnville than in 96% of U.S. towns, mostly from hurricanes
On FEMA’s National Risk Index, Hahnville gets a D− for hazard risk: higher expected damage per building than 96% of U.S. towns, #107 of 162 in Louisiana. Most of that expected damage is hurricanes (80%), then river and rain flooding (11%). FEMA’s files show no paid flood insurance claims here.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What stands out about Hahnville’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Hahnville faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
Hurricanes
River and rain flooding
Coastal flooding
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.
What’s behind Hahnville’s grade
Hurricanes are 80% of the building damage FEMA expects in Hahnville, and Hahnville’s rate of hurricanes damage is in the top 2% of U.S. census tracts. Coastal flooding adds 5%, at a rate in the top 2% of U.S. census tracts.
D− #107 of 162 in Louisiana; higher expected damage per building than 96% of U.S. towns (21,298).
All of Hahnville’s residents live in one census tract; the figures are that tract’s.
The typical Louisiana town has higher expected damage than 92% of U.S. towns; within the state, Hahnville has more expected damage per building than 66% of Louisiana towns.
In dollars, FEMA expects about $2.8M a year in losses across Hahnville: $2.2M to buildings, the rest to people and crops.
Does Hahnville flood? No paid flood claims on record
FEMA’s records show no paid flood insurance claims in Hahnville. That’s not a promise: most homes don’t carry flood insurance, so small floods go unrecorded.
Hahnville isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: St. Charles Parish.6 federal disasters brought FEMA money to Hahnville
Disasters that paid out in Hahnville itself (aid to households or repair grants to Hahnville), newest first, with that year’s flood claims.
- 2024Hurricane Francine200 households applied for aid$300K aid approved
- 2021Hurricane Ida1,366 households applied for aid$3.6M aid approved
- 2012Hurricane Isaac342 households applied for aid$167K aid approved
- 2008Hurricane Gustav571 households applied for aid$206K aid approved
- 2005Hurricane Katrina1,528 households applied for aid$2.4M aid approved
- 2004Hurricane Ivan48 households applied for aid$7K aid approved
St. Charles Parish has had 39 natural disasters declared by the President since 1953, most often hurricanes and tropical storms, then floods.
Old photos of Hahnville after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Hahnville archive →Hahnville and its neighbors
Hahnville is 2nd of the 5 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| New Sarpy | D−more damage than 96% | hurricanes | — |
| Hahnville | D−more damage than 96% | hurricanes | 0 |
| Norco | D−more damage than 96% | hurricanes | 717 |
| Destrehan | D−more damage than 97% | hurricanes | 2,055 |
| Luling | D−among the highest damage | coastal flooding | 220 |
| Taft | — | 112 residents; we grade 1,000+ | |
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 Hahnville faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- 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.
- 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.
- Know your evacuation zone and the way off the coast.
- Storm surge comes fast: leave when you’re told, not when the water arrives.
- Move cars to high ground before king tides and nor’easters.
- 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 Hahnville
Is Hahnville at risk for natural disasters?
On FEMA’s National Risk Index, Hahnville has higher expected damage per building than 96% of U.S. towns: D− for hazard risk, #107 of 162 in Louisiana. Most of the expected damage is hurricanes (80%) and river and rain flooding (11%). The figures are for the one census tract the town shares with its neighbors. This is FEMA’s model of an average year for today’s buildings, not a forecast.
Is Hahnville 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 St. Charles Parish, 55.7% of all homes carry federal flood insurance.
How much is flood insurance in Hahnville?
FEMA’s Community Rating System list shows no discount for Hahnville’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 Hahnville?
By FEMA money that reached Hahnville, Hurricane Ida (2021): 1,366 households applied for aid, $3.6M approved.
Is Hahnville at risk from hurricanes?
It is the largest share of the building damage FEMA expects here (80%), and Hahnville’s rate for it is in the top 2% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Hahnville.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Hahnville’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.