St. Tammany Parish, Louisiana: hazard risk
FEMA rates St. Tammany Parish's overall risk Relatively High (score 96.6 of 100, higher than 96% of rated U.S. counties); 5 of its 15 hazards are rated Relatively High or Very High, led by hurricane, lightning, riverine flooding. Its storm record holds 932 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Hurricane | Very High | 98.9 | $143M |
| Lightning | Relatively High | 95.7 | $2.1M |
| Riverine Flooding | Relatively High | 94.2 | $70M |
| Cold Wave | Relatively High | 92.7 | $9.2M |
| Coastal Flooding | Relatively High | 82.6 | $3.3M |
| Heat Wave | Relatively Moderate | 96.3 | $8.4M |
| Wildfire | Relatively Moderate | 89.6 | $1.4M |
| Hail | Relatively Moderate | 88.0 | $1.6M |
| Tornado | Relatively Moderate | 86.6 | $6.0M |
| Strong Wind | Relatively Moderate | 80.9 | $1.4M |
| Drought | Relatively Moderate | 80.2 | $988K |
| Winter Weather | Relatively Moderate | 79.0 | $208K |
| Ice Storm | Relatively Moderate | 78.1 | $370K |
| Earthquake | Relatively Low | 67.3 | $724K |
| Landslide | Very Low | 37.9 | $596 |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Severe thunderstorm wind | 370 | 4 | $4.5M | 18th of 64 | 841st of 3,080 |
| Floods | 164 | 0 | $22M | 8th of 64 | 703rd of 3,080 |
| Hail | 98 | 0 | – | 35th of 64 | 1991st of 3,080 |
| Heat | 79 | 0 | – | 36th of 64 | 741st of 3,076 |
| Tornadoes | 74 | 0 | $21M | 16th of 64 | 206th of 3,080 |
| Hurricanes and tropical storms | 52 | 7 | $9.3B | 12th of 64 | 156th of 1,849 |
| Drought | 27 | 0 | – | 46th of 64 | 1836th of 3,063 |
| Lightning | 26 | 1 | $999K | 6th of 64 | 231st of 3,080 |
| Winter storms | 14 | 0 | – | 58th of 64 | 2839th of 3,077 |
| Extreme cold | 8 | 0 | – | 40th of 64 | 2320th of 3,076 |
| Heavy rain | 7 | 0 | – | 11th of 64 | 1104th of 3,080 |
| High wind and dust storms | 4 | 0 | $484K | 22nd of 64 | 2687th of 3,080 |
| Wildfires | 1 | 0 | $19K | 12th of 64 | 1085th of 2,972 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full St. Tammany Parish record: every hazard by year and month, the deadliest events and FEMA's declarations.