St. Charles Parish
Louisiana — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 85th
St. Charles Parish faces medium composite natural disaster risk (NRI Risk Index score 85.1, 85th national percentile), driven primarily by hurricane and coastal flood exposure. Expected annual loss across all 18 hazard types is $57M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Hurricane | High | 0.28 / yr | $29M |
| Coastal Flood | Very High | 3.76 / yr | $13M |
| Heat Wave | Low | 14.74 / yr | $1M |
| Tornado | Medium | 0.26 / yr | $3M |
| Lightning | Medium | 91.19 / yr | $455K |
| Cold Wave | Low | 0.74 / yr | $1M |
| Riverine Flood | Low | 1.50 / yr | $8M |
| Drought | Low | 26.43 / yr | $182K |
| Hail | Low | 1.00 / yr | $232K |
| Earthquake | Very Low | 0.00 / yr | $114K |
| Winter Weather | Low | 0.84 / yr | $32K |
| Strong Wind | Low | 1.06 / yr | $187K |
| Wildfire | Very Low | 0.00 / yr | $7K |
| Ice Storm | Very Low | 0.07 / yr | $9K |
| Landslide | Very Low | 0.04 / yr | $37 |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for St. Charles Parish?
St. Charles Parish has a composite FEMA National Risk Index score of 85.1 out of 100, placing it in the Medium category and the 85th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in St. Charles Parish?
The three highest-rated hazards are Hurricane (High, $29M EAL), Coastal Flood (Very High, $13M EAL), Heat Wave (Low, $1M EAL). These account for most of the county's expected annual losses.
How does St. Charles Parish compare to other Louisiana counties?
St. Charles Parish ranks #20 of 64 Louisiana counties for overall natural disaster risk, with a medium rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. St. Charles Parish's $57M EAL is a statistical average, not a guarantee for any specific year or address.