Flood history · West Alton, MO 63386
Flood insurance claims in West Alton, MO 63386
2,078 claims since 1978 and $35.2 million paid. Here's what the public record shows, and how to check a specific address.
Claims by year
Every NFIP flood insurance claim reported in ZIP 63386 since 1978.
What the record says
Almost all claims here (99%) were on properties in high-risk zones (A or V). In those zones, federally regulated lenders require flood insurance.
Losses are spread across many events; the largest, Unnamed flooding, accounts for 24% of claims.
145 claims were filed in the last 10 years.
The most commonly recorded cause is rivers, streams or lakes overflowing.
St. Charles County * takes part in FEMA's Community Rating System (class 6), which can lower flood insurance premiums by up to 20% in high-risk zones.
Biggest flood events
| Event | Year | Claims | Share |
|---|---|---|---|
| Unnamed flooding | 1986 | 501 | 24% |
| Midwest Flooding | 1993 | 343 | 17% |
| Not a named storm | 1982 | 115 | 6% |
| Early winter storms | 2015 | 88 | 4% |
| Late spring severe storms | 2017 | 11 | 1% |
| Late spring storms | 2011 | 5 | 0% |
Flood zone at time of claim
NFIP communities
Federal disaster declarations in Saint Charles County
Flood, hurricane and storm declarations since 2000.
13 flood, storm or hurricane declarations for Saint Charles County since 2000.
Check a specific address in West Alton.
ZIP-level history is the backdrop. See the official FEMA flood zone, ground elevation and next steps for one property, free.
Sources: FEMA OpenFEMA NFIP Redacted Claims (v3) and Disaster Declarations Summaries, FEMA NFIP Community Status Book; place names from GeoNames (CC BY 4.0). Data as of 2026-10-09. Payments are net building + contents payments in dollars at the time paid, not adjusted for inflation. Claims are grouped by the ZIP code reported on the claim. This product uses the FEMA OpenFEMA API but is not endorsed by FEMA. Information only; not an official flood zone determination or insurance advice.