Toa Alta Municipio, Puerto Rico Natural Disaster Risk
FEMA National Risk Index assessment · PR
Very LowComposite Risk Score
National percentile: 0th
Toa Alta Municipio faces very low composite natural disaster risk (NRI Risk Index score 0.0, 0th national percentile), driven primarily by a mix of natural hazards exposure. Expected annual loss across all 18 hazard types is $38M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Toa Alta Municipio carries a very low composite natural disaster risk, with a National Risk Index score of 0.0 out of 100 — placing it in the 0th national percentile and among the lowest-risk counties in the country. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
No individual hazard records measurable expected loss in Toa Alta Municipio in the current dataset, which keeps its overall expected annual loss low at $38M.
Beyond physical exposure, Toa Alta Municipio has a very low social vulnerability rating (how susceptible the population is to harm) and a very low community resilience rating (its capacity to prepare for and recover from disasters). Both measures sit toward the lower end, indicating relatively modest population sensitivity.
The federal record bears this out: Toa Alta Municipio has received 25 federal disaster declarations since 1970, including 13 for hurricane events and 6 for flood events. The most recent was Tropical Storm Ernesto (severe storm), declared in August 2024.
Among 78 Puerto Rico counties, Toa Alta Municipio ranks #69 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.01 / yr | $0 |
| Cold Wave | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 1.50 / yr | $0 |
| Earthquake | Very Low | 0.04 / yr | $10M |
| Hail | Very Low | 0.03 / yr | $1K |
| Heat Wave | Very Low | 0.10 / yr | $0 |
| Hurricane | Very Low | 0.17 / yr | $20M |
| Ice Storm | Very Low | 0.00 / yr | $0 |
| Riverine Flood | Very Low | 0.25 / yr | $4M |
| Landslide | Very Low | 3.30 / yr | $3M |
| Lightning | Very Low | 65.25 / yr | $939K |
| Strong Wind | Very Low | 0.00 / yr | $2K |
| Tornado | Very Low | 0.00 / yr | $39K |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.01 / yr | $2K |
| Wildfire | Very Low | 0.00 / yr | $0 |
| Winter Weather | Very Low | 0.00 / yr | $0 |
Disaster History
Toa Alta Municipio has received 25 federal disaster declarations since 1970, most recently Tropical Storm Ernesto in August 2024. Most frequent causes: Hurricane (13), Flood (6), Severe Storm (3).
| Declared | Type | Disaster |
|---|---|---|
| August 2024 | Severe Storm | Tropical Storm Ernesto |
| July 2024 | Flood | Severe Storms, Flooding, Landslides, and Mudslides |
| September 2022 | Hurricane | Hurricane Fiona |
| September 2022 | Hurricane | Tropical Storm Fiona |
| August 2020 | Hurricane | Tropical Storm Laura |
| July 2020 | Hurricane | Potential Tropical Cyclone Nine |
| March 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| January 2020 | Earthquake | Earthquakes |
| August 2019 | Severe Storm | Tropical Storm Dorian |
Showing the 10 most recent of 25 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Toa Alta Municipio?
Toa Alta Municipio has a composite FEMA National Risk Index score of 0.0 out of 100, placing it in the Very Low category and the 0th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Toa Alta Municipio?
The three highest-rated hazards are Avalanche (Very Low, $0 EAL), Coastal Flood (Very Low, $0 EAL), Cold Wave (Very Low, $0 EAL). These account for most of the county's expected annual losses.
How does Toa Alta Municipio compare to other Puerto Rico counties?
Toa Alta Municipio ranks #69 of 78 Puerto Rico counties for overall natural disaster risk, with a very low rating.
How many federally declared disasters has Toa Alta Municipio had?
FEMA records 25 federal disaster declarations for Toa Alta Municipio since 1970, most often 13 for hurricane events and 6 for flood events. The most recent was Tropical Storm Ernesto, declared in August 2024.
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. Toa Alta Municipio's $38M EAL is a statistical average, not a guarantee for any specific year or address.