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Natural hazards · Sullivan

Sullivan, WI natural hazards

Most of the natural-hazard damage FEMA expects in Sullivan comes from inland flooding, and overall the risk is low for a U.S. community. Flood insurance has paid 1 claim here since 1979. 5 federal disasters brought FEMA money into town.

FEMA National Risk Index, December 2025 · OpenFEMA claims, aid & declarations
Expected damage

How exposed is Sullivan?

33
Low
vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Sullivan to be higher than in 33% of U.S. communities, mostly from inland flooding and tornadoes.

Inland flooding53%Tornadoes16%Cold waves15%Hail7%Everything else9%
By hazard

What Sullivan faces

Each hazard’s share of the damage FEMA expects here, and how that compares with the rest of the country.

Inland flooding

53% of expected damage
Below average · higher than 47% of U.S. places
Recorded about 2 times a year in the area

Tornadoes

16% of expected damage
Well above average · higher than 81% of U.S. places
Recorded about once every 26 years in the area

Cold waves

15% of expected damage
Below average · higher than 33% of U.S. places
Recorded about 5 times a year in the area

Hail

7% of expected damage
Well above average · higher than 89% of U.S. places
Recorded about 4 times a year in the area

Lower here

HurricanesIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightningDrought

Not a risk here

Coastal floodingAvalanchesTsunamisVolcanic activity
Flood risk changes street by street. Check a specific address on FEMA’s flood map, and ask about flood insurance before you buy.
Flood insurance claims

Does Sullivan flood?

Every paid claim on a federal flood insurance policy in Sullivan, from FEMA’s records.

1paid claims since 1979
$215paid to owners
0homes flooded more than once
19792026
of homes in flood zones
are insured
of all homes
are insured
No community discount. Sullivan isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.
Insurance rates: Jefferson County.
Disasters that hit Sullivan

5 federal disasters brought FEMA money here

Disasters the President declared that paid out in Sullivan itself: aid to households, or repair grants to the Village of Sullivan.

Brought FEMA money into SullivanDeclared for Jefferson County only
2026

Severe Storms, Tornadoes, and Flooding

1 household applied for aid $5K to the Village of Sullivan for repairs
2008

Severe Storms, Tornadoes, and Flooding

17 households applied for aid $13K aid approved
2008

Record Snow and Near Record Snow

$1K to the Village of Sullivan for repairs
2007

Severe Storms and Flooding

2 households applied for aid $11K aid approved
2004

Severe Storms and Flooding

1 household applied for aid $147 aid approved
Jefferson County has had 12 natural disasters declared since 1953, most often severe storms and floods.
Around Sullivan

Sullivan and the towns around it

Concord: Low, mostly inland floodingSullivan: Low, mostly inland floodingIxonia: Low, mostly inland floodingFarmington: Low, mostly inland floodingSummit: Low, mostly inland floodingOconomowoc: Moderate, mostly inland floodingOttawa: Low, mostly inland floodingJefferson: Low, mostly inland floodingPalmyra: Low, mostly inland floodingHebron: Low, mostly inland floodingSullivan: Low, mostly inland flooding SullivanConcordSullivan
Very lowLowModerateHighVery high
Sullivanmostly inland floodingLow
Concordmostly inland floodingLow
Sullivanmostly inland floodingLow
About these numbers

How to read this page

An average, not a forecastFEMA’s National Risk Index estimates the damage 18 kinds of natural hazards cause in a typical year, from decades of records and models. A quiet decade can follow a bad year.
Compared by rate“Higher than N%” compares yearly damage as a share of what’s here, so a big city isn’t rated riskier just for having more buildings. Sullivan is smaller than a census tract, so it shares the figures of the tract around its center.
Money that reached townFlood claims are matched to Sullivan’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Village of Sullivan. FEMA’s model follows property values, so a place that recently lost many homes can rate lower than it feels.

Sources: FEMA National Risk Index (December 2025); OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Census tracts: U.S. Census Bureau.

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01
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