Florissant, Missouri Flood Zones
Last updated: March 2026
Florissant faces flooding from Coldwater Creek in St. Louis County. Heavy rainfall events cause the creek to overflow and threaten residential neighborhoods along the creek corridor.
St. Louis County has recorded 12,025 NFIP flood insurance claims since 1978, totaling $264.5M in payouts. Explore the full NFIP claims data by state and county to see how this area compares nationally.
FEMA Region
Region 7
NFIP Policies
3,603
St. Louis County
Avg. Premium
$1,911/yr
St. Louis County
FEMA Flood Risk Profile: St. Louis County
Based on FEMA's National Risk Index, which evaluates flood risk at the county level using historical loss data, exposure, and vulnerability.
Inland Flood Risk
Relatively HighEst. annual loss: $240.3M
Hurricane Risk
Very LowEst. annual loss: $48K
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: St. Louis County
St. Louis County has been included in 11 federal flood-related disaster declarations.
...and 3 earlier declarations since 1982.
These declarations affected communities across St. Louis County, including Florissant.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: St. Louis County
Properties in St. Louis County have filed 12,025 NFIP flood insurance claims totaling $264.5M in payouts since 1978. The average claim payout is $22K.
Highest-Claim Years
1993
1,967 claims - $51.1M
1982
1,210 claims - $12.9M
1979
1,099 claims - $6.2M
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced March 2026. See national claims data.
Flood Insurance Coverage: St. Louis County
An estimated 0.9% of households in St. Louis County carry NFIP flood insurance. This county has elevated flood risk but very low insurance coverage, indicating a significant protection gap.
Penetration Rate
0.9%
Claims Ratio
1 in 1
policies have filed a claim
Avg. Claim Payout
$21,997
Derived from FEMA NRI population data and OpenFEMA NFIP policy/claims records.
Repetitive Loss Properties: St. Louis County
St. Louis County has 867 properties with multiple flood losses, including 156 severe repetitive loss properties. 46 properties have been mitigated.
Multiple Loss
867
Severe Rep. Loss
156
Mitigated
46
By Flood Zone
Source: OpenFEMA NFIP Multiple Loss Properties. Data sourced March 2026.
Recorded Flood Events: ST. LOUIS County
NOAA has recorded 81 flood events in ST. LOUIS County since 1996, causing $286.1M in damage and 7 deaths.
Costliest Events
Events by Type
Source: NOAA Storm Events Database, 1996-2026. Data sourced March 2026.
Flood Mitigation: St. Louis County
FEMA has funded mitigation for 894 properties in St. Louis County, investing $17.5M in flood risk reduction.
By Action Type
Source: OpenFEMA Hazard Mitigation Assistance. Data sourced March 2026.
What Your Flood Zone Means in Florissant
Florissant faces flood risk primarily from river and stream overflow during heavy rainfall, snowmelt, or upstream dam releases. When rivers exceed their banks, floodwaters spread across low-lying areas mapped in AE and A zones. The most common FEMA flood zone designations in Florissant are Zone AE, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $240.3M.
Riverine flood risk in Florissant is driven by the proximity and elevation of properties relative to nearby waterways. Properties closer to rivers with lower ground elevations typically face higher flood insurance premiums under FEMA's Risk Rating 2.0. If your property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance.
River flood maps can change when FEMA conducts new Flood Insurance Studies or when development alters drainage patterns. Letters of Map Amendment (LOMA) can remove individual properties if the natural ground elevation was always above the Base Flood Elevation and the property was inadvertently mapped in the SFHA. Use our free lookup tool to check the current flood zone for any Florissant address.
Flood Insurance Discount: Florissant
Florissant participates in FEMA's Community Rating System (CRS), a voluntary program that rewards communities for flood mitigation efforts beyond minimum NFIP requirements. Residents in the Special Flood Hazard Area may qualify for reduced flood insurance premiums.
CRS Class
Class 9
SFHA Premium Discount
5% off
CRS classes range from 1 (best) to 10 (no discount). Florissant's Class 9 rating means NFIP policyholders in the SFHA can receive up to a 5% discount on their flood insurance premiums. Properties outside the SFHA may receive a 5% discount.
Source: FEMA Community Rating System, October 2025. Discounts apply to NFIP policies only.
Florissant, MO Flood Zone FAQ
What flood zones are in Florissant, MO?
The most common FEMA flood zones in Florissant are Zone AE, Zone X. Properties in these high-risk zones (SFHA) may require flood insurance with a federally regulated or government-backed mortgage.
Is flood insurance required in Florissant?
If your Florissant property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance. Properties in Zone X are not federally required to carry flood insurance, though coverage is still recommended since over 40% of all NFIP flood claims come from Zone X properties.
How do I check my flood zone in Florissant?
Enter your Florissant address in the search tool above for an instant flood zone determination. Results include your FEMA flood zone, SFHA status, base flood elevation (if available), and FIRM panel information, pulled directly from FEMA's National Flood Hazard Layer.
Does Florissant offer flood insurance discounts?
Yes. Florissant participates in FEMA's Community Rating System (CRS) with a Class 9 rating, qualifying residents in the Special Flood Hazard Area for up to a 5% discount on NFIP flood insurance premiums. Properties outside the SFHA may receive a 5% discount.
Has Florissant experienced major flooding events?
St. Louis County, where Florissant is located, has been part of 11 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Severe Storms and Flooding in 2022. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Florissant?
St. Louis County has recorded 12,025 NFIP flood insurance claims totaling $264.5M in payouts since 1978. The year with the most claims was 1993, with 1,967 claims and $51.1M in payouts. These figures cover all NFIP claims in the county, including Florissant.
How many flood insurance policies are active in Florissant?
St. Louis County currently has 3,603 active NFIP flood insurance policies with an average annual premium of $1,911. The most policies are in Zone AE (1,772 policies). These figures cover all active NFIP policies in the county.
How many Florissant properties have flooded repeatedly?
St. Louis County has 867 properties with multiple flood losses on record, including 156 severe repetitive loss properties. These are properties that have experienced four or more NFIP claims of $5,000+ or two claims exceeding the building value.
Can my Florissant property be removed from a high-risk flood zone?
Yes, if your property's natural ground elevation is above the Base Flood Elevation and FEMA inadvertently mapped it in a high-risk zone, you can apply for a Letter of Map Amendment (LOMA). A successful LOMA removes the property from the Special Flood Hazard Area, generally eliminating the federal mandatory flood insurance requirement. You will need an elevation certificate from a licensed surveyor. If a property was raised above the BFE with fill material, the process is a LOMR-F rather than a LOMA.
What is Base Flood Elevation in Florissant?
Base Flood Elevation (BFE) is the predicted height of floodwaters during a 1% annual chance (100-year) flood, shown on FEMA maps as an elevation number in feet above sea level. In Florissant's Zone AE areas, BFE lines appear on the FIRM as wavy contours labeled with elevation values. Properties with a lowest floor at or above the BFE typically qualify for significantly lower NFIP flood insurance premiums.
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Look Up Any Florissant, MO Address
Enter a Florissant, MO address to instantly check its FEMA flood zone designation, SFHA status, and insurance requirements.
Disclaimer: Flood risk data on this page is sourced from FEMA datasets including the National Risk Index, NFIP claims and policy records, disaster declarations, and the Community Rating System. These datasets were last extracted on March 2026 and may not reflect the most recent changes. This page is for informational purposes only and is not a certified flood zone determination. Always verify current flood zone status through FEMA or a licensed determination provider before making property, insurance, or lending decisions.