Flood history · San Marcos, TX 78666
Flood insurance claims in San Marcos, TX 78666
816 claims since 1979 and $29.5 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 78666 since 1978.
What the record says
84% of claims were on properties in high-risk zones and 16% outside them.
Losses are spread across many events; the largest, Early summer storms, accounts for 30% of claims.
29 claims were filed in the last 10 years.
The most commonly recorded cause is rivers, streams or lakes overflowing.
San Marcos, City Of takes part in FEMA's Community Rating System (class 7), which can lower flood insurance premiums by up to 15% in high-risk zones.
Biggest flood events
| Event | Year | Claims | Share |
|---|---|---|---|
| Early summer storms | 2015 | 242 | 30% |
| Fall severe storms | 2015 | 220 | 27% |
| Unnamed flooding | 1998 | 213 | 26% |
| Hurricane Harvey | 2017 | 5 | 1% |
| Torrential rain | 2002 | 3 | 0% |
| Tropical Storm Claudette | 1979 | 1 | 0% |
Flood zone at time of claim
NFIP communities
Federal disaster declarations in Hays County
Flood, hurricane and storm declarations since 2000.
8 flood, storm or hurricane declarations for Hays County since 2000.
Check a specific address in San Marcos.
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.