Photo: Michael Barera · CC BY-SA 4.0For hail, Lewisville’s building-damage rate is in the top 3% of U.S. census tracts
On FEMA’s National Risk Index, Lewisville gets a B− for hazard risk: higher expected damage per building than 51% of U.S. towns, #324 of 642 in Texas. Most of that expected damage is river and rain flooding (59%), then hail (20%). Flood insurance has paid 54 claims here since 1982.
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 Lewisville’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Lewisville 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
Hail
Tornadoes
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 Lewisville’s grade
River and rain flooding is 59% of the building damage FEMA expects in Lewisville, and Lewisville’s rate of river and rain flooding damage is lower than 52% of U.S. census tracts. Hail adds 20%, at a rate in the top 3% of U.S. census tracts.
B− #324 of 642 in Texas; higher expected damage per building than 51% of U.S. towns (21,298).
Lewisville’s residents live in 36 census tracts; FEMA’s figures are combined by where they live.
The typical Texas town has higher expected damage than 50% of U.S. towns; within the state, Lewisville has more expected damage per building than 50% of Texas towns.
Among the 400 U.S. cities of 100,000 or more, Lewisville has lower expected damage per building than 60% (#162 of 400). Because it is so big, its total expected yearly loss, $41.3M, is the 287th largest of those 400.
Does Lewisville flood? Sometimes: 54 flood claims since 1982
Every paid claim on a federal flood insurance policy in Lewisville, from FEMA’s records: 1.0 per 1,000 homes, fewer than 78% of the 13,809 U.S. towns with a flood insurance record.
- The Early summer storms3 claims · $67K
Lewisville is in FEMA’s Community Rating System (class 8) for its flood-proofing work.
Insurance rates: Denton County.6 federal disasters brought FEMA money to Lewisville
Disasters that paid out in Lewisville itself (aid to households or repair grants to the City of Lewisville), newest first, with that year’s flood claims.
- 2024Severe Storms, Straight-line Winds, Tornadoes, and Flooding361 households applied for aid$249K aid approved1 flood claim paid that year
- 2021Severe Winter Storms1,514 households applied for aid$540K aid approved$108K to the City of Lewisville for repairs
- 2015Severe Storms, Tornadoes, Straight-line Winds and Flooding59 households applied for aid$72K aid approved$69K to the City of Lewisville for repairs4 flood claims paid that year
- 2007Severe Storms, Tornadoes, and Flooding7 households applied for aid$2K aid approved
- 2007Severe Storms and Tornadoes7 households applied for aid$358 aid approved
- 2005Hurricane Katrina Evacuation$39K to the City of Lewisville for repairs
Denton County has had 17 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.
Also 1 FEMA wildfire suppression grant (Fire Management Assistance, not a disaster declaration) for fires in Denton County, 2006–2006.
Old photos of Lewisville after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Lewisville archive →Lewisville and its neighbors
Lewisville is 5th of the 8 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 |
|---|---|---|---|
| The Colony | Bless damage than 64% | river and rain flooding | 5 |
| Hickory Creek | Bless damage than 62% | river and rain flooding | 1 |
| Grapevine | B−less damage than 54% | river and rain flooding | 47 |
| Flower Mound | B−less damage than 51% | river and rain flooding | 35 |
| Lewisville | B−more damage than 51% | river and rain flooding | 54 |
| Highland Village | B−more damage than 51% | river and rain flooding | 14 |
| Carrollton | B−more damage than 52% | river and rain flooding | 76 |
| Coppell | C−more damage than 82% | river and rain flooding | 14 |
| Hebron | — | 253 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 Lewisville 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.
- Park in a garage or under cover when storms are forecast.
- Stay away from windows while it falls.
- Photograph roof and car damage for your insurer.
- Pick your spot now: the lowest floor, an inside room, no windows.
- A watch means be ready; a warning means take cover now.
- Keep shoes and a flashlight by the bed.
- 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.
- Lewisville residents get 10% off flood insurance.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Lewisville
Is Lewisville at risk for natural disasters?
On FEMA’s National Risk Index, Lewisville has higher expected damage per building than 51% of U.S. towns: B− for hazard risk, #324 of 642 in Texas. Most of the expected damage is river and rain flooding (59%) and hail (20%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Lewisville flood?
Flood insurance has paid 54 claims in Lewisville since 1982, $1.6M in all, or 1.0 per 1,000 homes, fewer than 78% of U.S. towns with a flood insurance record. 7 properties have flooded more than once. The most claims came from Early summer storms (3).
Is Lewisville 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 Denton County, 28% of homes in mapped flood zones carry federal flood insurance, and 0.7% of all homes do.
How much is flood insurance in Lewisville?
Lewisville is in FEMA’s Community Rating System (class 8), which takes 10% off federal flood insurance policies for its flood-proofing work. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Lewisville?
By FEMA money that reached Lewisville, Severe Winter Storms (2021): 1,514 households applied for aid, $540K approved, and $108K to the City of Lewisville for repairs. By flood claims, Early summer storms: 3 paid, $67K.
Is Lewisville at risk from river and rain flooding?
It is the largest share of the building damage FEMA expects here (59%), and Lewisville’s rate for it is lower than 52% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Lewisville.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Lewisville’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.