Natural hazards · Johnsburg

Johnsburg, IL natural hazards

Most of the natural-hazard damage FEMA expects in Johnsburg comes from inland flooding, and overall the risk is moderate for a U.S. community. Flood insurance has paid 27 claims here since 1979. 6 federal disasters brought FEMA money into town.

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

Expected damage

How exposed is Johnsburg?

Moderate

vs. U.S. communities

FEMA expects yearly storm and flood damage to homes and buildings in Johnsburg to be higher than in 45% of U.S. communities, mostly from inland flooding and tornadoes.

Inland flooding61%Tornadoes17%Cold waves16%Everything else6%

By hazard

What Johnsburg faces

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

Inland flooding

61% of expected damage

Above average · higher than 68% of U.S. places

Recorded about once a year in the area

Tornadoes

17% of expected damage

Well above average · higher than 83% of U.S. places

Cold waves

16% of expected damage

Below average · higher than 31% of U.S. places

Recorded about 6 times a year 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 Johnsburg flood?

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

27paid claims since 1979

$577Kpaid to owners

6homes flooded more than once

19792026

Biggest named events

Mid-spring storms: 11 claims, $131K

Homes that flooded again and again

■ FEMA “severe repetitive loss” (0) ■ flooded 2+ times

of homes in flood zones
are insured

of all homes
are insured

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

Insurance rates: McHenry County.

Disasters that hit Johnsburg

6 federal disasters brought FEMA money here

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

Brought FEMA money into JohnsburgDeclared for McHenry County only

2013

Severe Storms, Straight-Line Winds, and Flooding

11 households applied for aid $9K aid approved $3K to the Village of Johnsburg for repairs

2011

Severe Winter Storm and Snowstorm

$17K to the Village of Johnsburg for repairs

2008

Record Snow and Near Record Snow

$10K to the Village of Johnsburg for repairs

2006

Snow

$7K to the Village of Johnsburg for repairs

2000

Illinois Winter Snow Storms

$4K to the Village of Johnsburg for repairs

1999

Il-Winter Storm 1/1/99

$6K to the Village of Johnsburg for repairs

McHenry County has had 14 natural disasters declared since 1953, most often winter storms and floods.

Around Johnsburg

Johnsburg and the towns around it

Very lowLowModerateHighVery high

Lakemoormostly inland floodingVery high

Pistakee Highlandsmostly inland floodingVery high

McHenrymostly inland floodingHigh

Johnsburgmostly inland floodingModerate

Ringwoodmostly inland floodingModerate

McCullom Lakemostly inland floodingModerate

Wonder Lakemostly 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. Johnsburg 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 Johnsburg’s own flood-insurance community; household aid to the registrant’s city; repair grants to the Village of Johnsburg. 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.