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Natural hazards · Florissant

Florissant, MO natural hazards

Most of the natural-hazard damage FEMA expects in Florissant comes from heat waves, and overall the risk is high for a U.S. community. Flood insurance has paid 276 claims here since 1978. 12 federal disasters brought FEMA money into town.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations
Expected damage

How exposed is Florissant?

63
High
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Florissant to be higher than in 63% of U.S. communities, mostly from heat waves and inland flooding.

Heat waves41%Inland flooding26%Earthquakes18%Cold waves7%Everything else8%
By hazard

What Florissant faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Heat waves

41% of expected damage
Above average · higher than 64% of U.S. places
Recorded about 15 times a year in the area

Inland flooding

26% of expected damage
Above average · higher than 68% of U.S. places
Recorded about 3 times a year in the area

Earthquakes

18% of expected damage
Well above average · higher than 83% of U.S. places

Cold waves

7% of expected damage
Well below average · higher than 18% of U.S. places
Recorded about 2 times a year in the area

Lower here

HurricanesTornadoesHailIce stormsWinter weatherWildfireLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic activity
Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.
Flood insurance claims

Does Florissant flood?

Every paid claim on a federal flood insurance policy in Florissant, from FEMA’s records.

276paid claims since 1978
$5.4Mpaid to owners
23homes flooded more than once
19782026

Biggest named events

  • Hurricane Ike: 83 claims, $1.8M
  • Late July Flooding: 29 claims, $2.6M
  • Early winter storms: 18 claims, $254K

Homes that flooded again and again

■ FEMA “severe repetitive loss” (1) ■ flooded 2+ times

of homes in flood zones
are insured
of all homes
are insured
🏷️ 05% off flood insurance. Florissant is in FEMA’s Community Rating System (class 9) for its flood-proofing work.
Insurance rates: St. Louis County.

What’s been done with FEMA grants

7flood-prone properties bought out and cleared
Disasters that hit Florissant

12 federal disasters brought FEMA money here

Disasters the President declared that paid out in Florissant itself: aid to households, or repair grants to the City of Florissant.

Brought FEMA money into FlorissantDeclared for St. Louis County only
2025

Severe Storms, Straight-Line Winds, Tornadoes, and Flooding

466 households applied for aid $852K aid approved
2025

Severe Storms, Straight-Line Winds, Tornadoes, and Wildfires

613 households applied for aid $689K aid approved
2022

Severe Storms and Flooding

2,029 households applied for aid $3.8M aid approved $47K to the City of Florissant for repairs
2017

Severe Storms, Tornadoes, Straight-Line Winds and Flooding

136 households applied for aid $95K aid approved
2015

Severe Storms, Tornadoes, Straight-Line Winds, and Flooding

278 households applied for aid $281K aid approved $11K to the City of Florissant for repairs
2011

Severe Storms, Tornadoes, and Flooding

36 households applied for aid $22K aid approved
2008

Severe Storms, Flooding, and a Tornado

255 households applied for aid $323K aid approved
2008

Severe Storms and Flooding

21 households applied for aid $13K aid approved
2007

Severe Winter Storms and Flooding

$758 to the City of Florissant for repairs
2006

Severe Winter Storms

$194K to the City of Florissant for repairs
2006

Severe Storms

$180K to the City of Florissant for repairs
2003

Severe Storms, Tornadoes, and Flooding

9 households applied for aid $4K aid approved
St. Louis County has had 29 natural disasters declared since 1953, most often severe storms and floods.
Around Florissant

Florissant and the towns around it

Hazelwood: Moderate, mostly heat wavesOld Jamestown: High, mostly inland floodingCalverton Park: Low, mostly heat wavesBlack Jack: High, mostly inland floodingFerguson: High, mostly heat wavesBridgeton: High, mostly inland floodingBerkeley: Moderate, mostly heat wavesSpanish Lake: Moderate, mostly heat wavesDellwood: High, mostly heat wavesCool Valley: High, mostly inland floodingJennings: High, mostly heat wavesNormandy: Moderate, mostly earthquakesKinloch: Moderate, mostly inland floodingFlorissant: High, mostly heat waves FlorissantHazelwoodOld JamestownCalverton ParkBlack JackFerguson
Very lowLowModerateHighVery high
Old Jamestownmostly inland floodingHigh
Black Jackmostly inland floodingHigh
Florissantmostly heat wavesHigh
Fergusonmostly heat wavesHigh
Hazelwoodmostly heat wavesModerate
Calverton Parkmostly heat wavesLow
About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Florissant covers 9 census tracts, combined by population.
Money that reached townFlood claims are matched to Florissant’s own flood-insurance community; household aid to the registrant’s city; repair grants to the City of Florissant. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

FEMA’s expected losses across Florissant total about $26.3M a year, counting buildings, people and crops.

Sources: FEMA National Risk Index (December 2025); 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. Census tracts: U.S. Census Bureau.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01
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