Ozaukee County, WI
FEMA National Risk Index scores, disaster declarations & hazard data
Ozaukee County has experienced 13 federally declared disasters since 1965, most recently Covid-19 in 2020. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Ozaukee County's highest-rated hazards are cold wave, hail, and tornado, with its top risk rated "Relatively Moderate" by FEMA's National Risk Index. Recorded storm events have decreased 60% over the past five years compared to the prior five-year period. Community vulnerability is relatively low (4th percentile nationally), indicating stronger recovery capacity than most US counties.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Ozaukee County has been designated in 13 declarations since 1965, covering 6 disaster types including flood (4), severe storm (4), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Flood | Severe Storms, Tornadoes, Straight-Line Winds, Flooding, And Landslides |
| 2008 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2005 | Hurricane | Hurricane Katrina Evacuation |
| 2004 | Severe Storm | Severe Storms And Flooding |
| 2001 | Snowstorm | Snow |
| 1997 | Severe Storm | Severe Storms And Flooding |
| 1991 | Severe Storm | Severe Storms & Hail |
| 1987 | Flood | Severe Storms & Flooding |
Showing the 10 most recent of 13 total declarations since 1965.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 19.5 | 0 | 0 | — |
| Inland Flooding | Relatively Low | 58.3 | 21 | 1 | $1.4M |
| Coastal Flooding | Very Low | 31 | 3 | 0 | $65K |
| Earthquake | Very Low | 26.4 | — | — | — |
| Heat Wave | Relatively Low | 56 | 9 | 0 | — |
| Tornado | Relatively Low | 59.3 | 0 | 0 | — |
| Hurricane | Very Low | 7.5 | 0 | 0 | — |
| Hail | Relatively Low | 71.2 | 23 | 0 | — |
| Strong Wind | Relatively Low | 31 | 0 | 0 | — |
| Winter Weather | Relatively Low | 44.2 | 0 | 0 | — |
| Ice Storm | Very Low | 20.6 | — | — | — |
| Cold Wave | Relatively Moderate | 82.8 | — | — | — |
| Lightning | Relatively Low | 41.4 | 0 | 0 | — |
| Drought | Very Low | 21.5 | 0 | 0 | — |
| Landslide | Very Low | 15.4 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Insufficient Data | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Ozaukee County ranks in the 4th percentile (Very low) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 4th | Very low |
| Socioeconomic status | 3rd | Very low |
| Household characteristics | 9th | Very low |
| Racial & ethnic minority status | 28th | Low |
| Housing type & transportation | 15th | Very low |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 14th | Very Low |
| Risk to homes | 13th | Very Low |
| Buildings in direct exposure zone | 40.9% | — |
NOAA tracked 56 weather events in this county over 2016–2025: 40 in 2016–20 vs 16 in 2021–25 (-60% — frequency decreasing).
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Ozaukee County?
According to the FEMA National Risk Index, the highest-risk hazards in Ozaukee County, Wisconsin are cold wave, hail, and tornado. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Ozaukee County received federal disaster declarations?
Yes. Ozaukee County has received 13 federal disaster declarations since 1965, including declarations in 2020. The most common disaster type on record is flood (4 declarations).
Has Ozaukee County had any FEMA disaster declarations in 2024, 2025, or 2026?
No federal disaster declarations have been recorded for Ozaukee County since the start of 2024. Its most recent declaration on record is Covid-19 in 2020.
How does Ozaukee County's natural hazard risk compare to nearby counties?
Among neighboring counties, Milwaukee County, WI has the highest overall natural hazard risk (Relatively High) and Washington County, WI has the lowest (Relatively Low). Ozaukee County is rated Relatively Low overall.
How is Ozaukee County's composite disaster risk index calculated?
Ozaukee County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Ozaukee County's composite score of 50 means its overall natural hazard risk is higher than 50% of US counties.