Natural hazards · Mazon

Mazon, IL natural hazards

Most of the natural-hazard damage FEMA expects in Mazon comes from inland flooding, and overall the risk is high for a U.S. community. 2 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Mazon?

High

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Mazon to be higher than in 79% of U.S. communities, mostly from inland flooding and cold waves.

Inland flooding60%Cold waves27%Tornadoes8%Everything else6%

By hazard

What Mazon faces

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

Inland flooding

60% of expected damage

Well above average · higher than 92% of U.S. places

Recorded about once a year in the area

Cold waves

27% of expected damage

Well below average · higher than 18% of U.S. places

Recorded about 5 times a year in the area

Tornadoes

8% of expected damage

Well above average · higher than 86% of U.S. places

Recorded about once every 7 years in the area

Lower here

HurricanesHailIce 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 Mazon flood?

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

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: Grundy County.

Disasters that hit Mazon

2 federal disasters brought FEMA money here

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

Brought FEMA money into MazonDeclared for Grundy County only

2011

Severe Winter Storm and Snowstorm

$3K to the Township of Mazon for repairs

1999

Il-Winter Storm 1/1/99

$3K to the Township of Mazon for repairs

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

Around Mazon

Mazon and the towns around it

Very lowLowModerateHighVery high

Wauponseemostly inland floodingVery high

Mazonmostly inland floodingHigh

Viennamostly inland floodingHigh

Goodfarmmostly inland floodingHigh

Mainemostly cold wavesLow

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