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Sewall Andrews HouseSewall Andrews House · Photo: Boscophotos · CC BY-SA 3.0
A−Hazard risk
Natural hazards in Mukwonago · FEMA

FEMA puts Mukwonago’s expected hazard damage per building below that of 79% of U.S. towns, mostly from river and rain flooding

On FEMA’s National Risk Index, Mukwonago gets an A− for hazard risk: lower expected damage per building than 79% of U.S. towns, #177 of 362 in Wisconsin. Most of that expected damage is river and rain flooding (77%), then tornadoes (13%). Flood insurance has paid 1 claim here since 2008.

River and rain flooding 77%Tornadoes 13%Hail 8%

Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded

less than 79%of U.S. townsLess damageMoreExpected yearly damage per dollar of building, vs. the 21,298 U.S. towns we grade#177 of 362 in Wisconsin
Hazard risk
A−#177 of 362
in Wisconsin · lower than 79% of U.S. towns
Main hazard
River and rain flooding
77% of expected building damage
Flood claims
1
paid since 2008 · $5K
Disasters paid out here
6
of 16 declared for Waukesha County
By hazard

What Mukwonago faces

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

River and rain flooding

77%of expected building damage
Below average · lower than 62% of U.S. census tracts
Recorded about 2 times a year in the area

Tornadoes

13%of expected building damage
Above average · higher than 74% of U.S. census tracts

Hail

8%of expected building damage
Well above average · higher than 85% of U.S. census tracts
Recorded about 4 times a year in the area
Smaller shares here
 Strong wind Ice storms Earthquakes Lightning Wildfire Hurricanes Winter storms Cold waves Heat waves Landslides
FEMA models no building damage here
Coastal floodingAvalanchesTsunamisVolcanic activity
People, not buildings.Counting harm to people as well as buildings, FEMA’s model puts cold waves at 22% of Mukwonago’s expected losses. Cold waves do little damage to buildings (0.0%), so they aren’t part of the grade.

Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.

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

What’s behind Mukwonago’s grade

River and rain flooding is 77% of the building damage FEMA expects in Mukwonago, and Mukwonago’s rate of river and rain flooding damage is lower than 62% of U.S. census tracts. Next is tornadoes at 13% (higher than 74% of U.S. census tracts).

Where Mukwonago sits
Mukwonago
Least damageMiddleMost damage

A− #177 of 362 in Wisconsin; lower expected damage per building than 79% of U.S. towns (21,298).

Mukwonago’s residents live in 5 census tracts; FEMA’s figures are combined by where they live.

What drives the damage to buildings
River and rain flooding77%Tornadoes13%Hail8%Everything else3%

The typical Wisconsin town has lower expected damage than 79% of U.S. towns; within the state, Mukwonago has less expected damage per building than 51% of Wisconsin towns.

In dollars, FEMA expects about $2.8M a year in losses across Mukwonago: $1.7M to buildings, the rest to people and crops.

A small-area figure. Mukwonago covers 5 census tracts, combined by where residents live. FEMA’s model is an average year for today’s buildings, not a record: the claims and disasters below are the record.

How TownRatings grades hazard risk →

Flood insurance claims

Does Mukwonago flood? Rarely: 1 flood claim since 2008

Every paid claim on a federal flood insurance policy in Mukwonago, from FEMA’s records: 0.3 per 1,000 homes, fewer than 95% of the 13,809 U.S. towns with a flood insurance record.

Paid flood claims, by year
2008: 1 claim2009: 0 claims2010: 0 claims2011: 0 claims2012: 0 claims2013: 0 claims2014: 0 claims2015: 0 claims2016: 0 claims2017: 0 claims2018: 0 claims2019: 0 claims2020: 0 claims2021: 0 claims2022: 0 claims2023: 0 claims2024: 0 claims2025: 0 claims2026: 0 claims2008
20082026
1
paid claims since 2008
$5K
paid to owners
0
homes flooded more than once
$5K
average claim
of homes in flood zones are insured
of all homes are insured
No community discount

Mukwonago isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Waukesha County.
Disasters

6 federal disasters brought FEMA money to Mukwonago

Disasters that paid out in Mukwonago itself (aid to households or repair grants to the Village of Mukwonago), newest first, with that year’s flood claims.

  1. 2026Severe Storms, Tornadoes, and Flooding4 households applied for aid$9K aid approved
  2. 2025Severe Storms, Straight-line Winds, Flooding, and Mudslides3 households applied for aid$4K aid approved
  3. 2008Severe Storms, Tornadoes, and Flooding64 households applied for aid$90K aid approved$7K to the Village of Mukwonago for repairs
  4. 2008Record Snow and Near Record Snow$11K to the Village of Mukwonago for repairs
  5. 2004Severe Storms and Flooding2 households applied for aid$3K aid approved
  6. 2000Snow$6K to the Village of Mukwonago for repairs
Disasters declared, by decade
Paid out in MukwonagoWaukesha County only

Waukesha County has had 16 natural disasters declared by the President since 1953, most often floods, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.

Were you here?

Old photos of Mukwonago after a storm or flood belong in the town’s history. Add one, or share what you remember below.

Add to the Mukwonago archive →
Next door

Mukwonago and its neighbors

Mukwonago has the lowest expected damage per building of the 3 graded towns here. Tap a town to see its hazards.

Mukwonago: not gradedVernon: hazard risk B+East Troy: hazard risk B+MukwonagoVernonEast TroyMukwonago
Lowest fifthSecondMiddleFourthHighest fifth
TownHazard riskMostly (buildings)Flood claims
MukwonagoA−less damage than 79%river and rain flooding1
East TroyB+less damage than 74%river and rain flooding—
VernonB+less damage than 69%river and rain flooding1
Mukwonago—not graded yet

Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.

Be ready

Get ready for what Mukwonago faces

A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.

When the river rises
  • Turn around at flooded roads: a foot of moving water can carry off a car.
  • Flood insurance usually takes 30 days to start, so buy it before the forecast.
  • Keep papers and medicines up high, in a grab-and-go bag.
More from Ready.gov ↗
Tornado warnings
  • Pick your spot now: the lowest floor, an inside room, no windows.
  • A watch means be ready; a warning means take cover now.
  • Keep shoes and a flashlight by the bed.
More from Ready.gov ↗
Hail
  • Park in a garage or under cover when storms are forecast.
  • Stay away from windows while it falls.
  • Photograph roof and car damage for your insurer.
More from Ready.gov ↗
Before you buy or rent
  • Look up the address on FEMA’s flood map.
  • Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
  • Get a flood insurance quote early: policies usually start 30 days after you buy.
When a storm is coming
Forecast and alertsWeather →911, the nearest ERSafety →

Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.

Questions about natural hazards in Mukwonago

Is Mukwonago at risk for natural disasters?

On FEMA’s National Risk Index, Mukwonago has lower expected damage per building than 79% of U.S. towns: A− for hazard risk, #177 of 362 in Wisconsin. Most of the expected damage is river and rain flooding (77%) and tornadoes (13%). This is FEMA’s model of an average year for today’s buildings, not a forecast.

Does Mukwonago flood?

Flood insurance has paid 1 claim in Mukwonago since 2008, $5K in all, or 0.3 per 1,000 homes, fewer than 95% of U.S. towns with a flood insurance record.

Is Mukwonago in a flood zone?

Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Waukesha County, 66% of homes in mapped flood zones carry federal flood insurance, and 0.6% of all homes do.

How much is flood insurance in Mukwonago?

FEMA’s Community Rating System list shows no discount for Mukwonago’s flood program. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.

What was the biggest storm in Mukwonago?

By FEMA money that reached Mukwonago, Severe Storms, Tornadoes, and Flooding (2008): 64 households applied for aid, $90K approved, and $7K to the Village of Mukwonago for repairs.

Is Mukwonago at risk from river and rain flooding?

It is the largest share of the building damage FEMA expects here (77%), and Mukwonago’s rate for it is lower than 62% of U.S. census tracts.

Storm stories

Memories, warnings and help from neighbors in Mukwonago.

Town Square →
Start the conversation

Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Mukwonago’s residents lived in the 2020 census; 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. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.