Natural hazards · Duncan

Duncan, IA natural hazards

Most of the natural-hazard damage FEMA expects in Duncan comes from drought, and overall the risk is moderate for a U.S. community.

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

Expected damage

How exposed is Duncan?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Duncan to be higher than in 42% of U.S. communities, mostly from drought and inland flooding.

Drought34%Inland flooding29%Cold waves16%Tornadoes12%Everything else9%

By hazard

What Duncan faces

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

Drought

34% of expected damage

Recorded about 23 times a year in the area

Inland flooding

29% of expected damage

Below average · higher than 44% of U.S. places

Recorded about once a year in the area

Cold waves

16% of expected damage

Well above average · higher than 77% of U.S. places

Recorded about 11 times a year in the area

Tornadoes

12% of expected damage

Well above average · among the top 1% of U.S. places

Recorded about once every 5 years in the area

Lower here

HailIce stormsWinter weatherHeat wavesWildfireEarthquakesLandslidesStrong windLightning

Not a risk here

Coastal floodingHurricanesAvalanchesTsunamisVolcanic 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 Duncan flood?

FEMA's records show no paid flood insurance claims in Duncan.

of homes in flood zones
are insured

of all homes
are insured

No community discount. Duncan isn’t in FEMA’s Community Rating System, which cuts flood insurance up to 45% in towns that do extra flood-proofing.

Insurance rates: Hancock County.

Disasters that hit Duncan

Federal disasters declared here

None of the disasters declared for Hancock County shows FEMA aid or repair money reaching Duncan itself in FEMA’s records.

Brought FEMA money into DuncanDeclared for Hancock County only

Hancock County has had 13 natural disasters declared since 1953, most often severe storms and floods.

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. Duncan 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 Duncan’s own flood-insurance community; household aid to the registrant’s city; repair grants to Duncan. 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.