St. Mary Parish
Louisiana — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 89th
St. Mary Parish faces medium composite natural disaster risk (NRI Risk Index score 88.9, 89th national percentile), driven primarily by hurricane and coastal flood exposure. Expected annual loss across all 18 hazard types is $61M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Hurricane | High | 0.23 / yr | $39M |
| Coastal Flood | High | 3.83 / yr | $6M |
| Drought | High | 24.36 / yr | $1M |
| Tornado | Medium | 0.59 / yr | $4M |
| Cold Wave | Medium | 0.92 / yr | $2M |
| Heat Wave | Low | 9.44 / yr | $898K |
| Lightning | Medium | 88.17 / yr | $343K |
| Riverine Flood | Low | 0.89 / yr | $5M |
| Strong Wind | Low | 0.66 / yr | $389K |
| Earthquake | Very Low | 0.00 / yr | $150K |
| Hail | Low | 0.92 / yr | $155K |
| Winter Weather | Low | 0.69 / yr | $29K |
| Ice Storm | Low | 0.12 / yr | $29K |
| Landslide | Very Low | 0.06 / yr | $63 |
| Wildfire | Very Low | 0.00 / yr | $4K |
| 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. Mary Parish?
St. Mary Parish has a composite FEMA National Risk Index score of 88.9 out of 100, placing it in the Medium category and the 89th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in St. Mary Parish?
The three highest-rated hazards are Hurricane (High, $39M EAL), Coastal Flood (High, $6M EAL), Drought (High, $1M EAL). These account for most of the county's expected annual losses.
How does St. Mary Parish compare to other Louisiana counties?
St. Mary Parish ranks #14 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. Mary Parish's $61M EAL is a statistical average, not a guarantee for any specific year or address.