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Natural hazard risk in Will County, Illinois

Updated October 30, 2026. Based on FEMA, NOAA and OpenFEMA data. Published by Humblebee.

FEMA overall Risk Index rating: Relatively High (score 97.2 of 100)[5]

Expected annual loss (FEMA)
$348.1 million[1]
Federal disaster declarations since 1967
17[2]
NFIP flood claims paid, 1978 to 2026
$21.1 million[3]
Tornadoes recorded, 1950 to 2024
93[4]

FEMA's National Risk Index rates overall natural hazard risk in Will County, Illinois as Relatively High compared with other US counties[5]. The hazards with the highest FEMA scores within the county are cold wave, tornado and inland flooding[6].

FEMA risk ratings for each hazard

Ratings and expected losses from the FEMA National Risk Index. Each rating compares this county with all US counties for that hazard, from Very Low to Very High. They are planning estimates, not predictions, and they do not describe any single property.

FEMA's National Risk Index (version 1.20, December 2025) estimates $348.1 million a year in Expected Annual Loss from all 18 natural hazards in Will County[1]. This is a FEMA estimate of average yearly loss, not money anyone paid[7]. By FEMA's values, the largest parts of that loss come from inland flooding, cold wave and tornado, in that order[8]. FEMA rates social vulnerability Very Low here, meaning social groups are less susceptible to harm from natural hazards compared with other US counties[9]. FEMA rates community resilience Very High, which describes the ability to prepare for, withstand and recover from hazards[10].

Hazards sorted by FEMA hazard-type Risk Index score, highest first
HazardFEMA risk ratingExpected annual loss
Cold WaveVery High$72.3 million[11]
TornadoVery High$63.1 million[12]
Inland FloodingRelatively High$193.0 million[13]
Heat WaveRelatively Moderate$8.5 million[14]
Winter WeatherRelatively High$617,000[15]
EarthquakeRelatively Moderate$7.1 million[16]
LightningRelatively High$1.5 million[17]
Ice StormRelatively Moderate$532,000[18]
HailRelatively Low$498,000[19]
LandslideVery Low$3,362[20]
WildfireVery Low$88,000[21]
Strong WindRelatively Low$730,000[22]
DroughtRelatively Low$72,000[23]
HurricaneVery Low$14,000[24]

Rated Not Applicable by FEMA for this county: avalanche, coastal flooding, tsunami, volcanic activity[25].

Social vulnerability and community resilience

FEMA uses these two ratings to scale expected losses into the Risk Index.

FEMA measureRatingScore
Social vulnerabilityVery Low13.3[9]
Community resilienceVery High92.3[10]

Flooding and flood insurance

FEMA rates inland flooding risk Relatively High in Will County, with an Expected Annual Loss of $193.0 million a year[13]. OpenFEMA lists 1,026 residential flood insurance contracts in force as of 2026-08-03[26]. Inside FEMA's mapped Special Flood Hazard Area, 22.7% of homes are insured[26]. OpenFEMA's NFIP claims show 2,295 claims filed for losses from 1978 to 2026, and NFIP paid $21.1 million in total[3]. To check a specific address, use FEMA's Flood Map Service Center[27].

Measure Value
Inland Flooding, FEMA risk rating[13] Relatively High, $193.0 million expected loss a year
NFIP residential flood policies in force (2026)[26] 1,026 of 220,472 homes
Homes in FEMA's mapped high-risk flood area (SFHA)[26] 3,291, of which 747 insured
NFIP flood claims, 1978 to 2026[3] 2,295 filed, $21.1 million paid

Is a specific address in a flood zone? Only FEMA's flood maps answer that, property by property[27]. This page describes the whole county.

Search an address on the FEMA Flood Map Service Center

Disaster declarations and tornado records

OpenFEMA lists 17 federal disaster declarations for natural hazards that include Will County since 1967[2]. The most recent is DR-4819-IL, declared 2024-09-20[28]. NOAA's tornado database records 93 tornadoes touching the county from 1950 to 2024, and the most recent was on 2024-07-15[4]. Of these, 6 were rated F3/EF3 or stronger[4].

Federal disaster declarations for natural hazards that include Will County, since 1967
Incident type Declarations
Severe Storm[2] 5
Snowstorm[2] 4
Flood[2] 4
Tornado[2] 3
Hurricane[2] 1
Most recent declarations
Declaration Incident Declared
DR-4819-IL[28] Severe Storms, Tornadoes, Straight-Line Winds, And Floodng 2024-09-20
DR-4157-IL[28] Severe Storms, Straight-Line Winds, And Tornadoes 2013-11-26
DR-4116-IL[28] Severe Storms, Straight-Line Winds, And Flooding 2013-05-10
DR-1960-IL[28] Severe Winter Storm And Snowstorm 2011-03-17
DR-1800-IL[28] Severe Storms And Flooding 2008-10-03

How to prepare

Steps from Ready.gov, FEMA's preparedness site, for the hazards with the highest FEMA ratings here. Follow instructions from local officials and the National Weather Service when a warning is issued.

Winter storms and cold

Before

  • Insulate your home and learn how to keep pipes from freezing.
  • Install and test smoke and carbon monoxide detectors with battery backup.
  • Keep several days of supplies in case the power goes out, including medication and pet needs.
  • Put an emergency kit in your car with jumper cables, sand, blankets, water and snacks, and keep the tank full.

During

  • Under a winter storm warning, find shelter right away.
  • Stay off the roads if you can. If you are stuck in your car, stay inside it.
  • Run generators and grills only outdoors, away from windows, and never heat your home with an oven or stove.

Source: Ready.gov, winter storms and cold

Tornadoes

Before

  • Learn the warning signs: a rotating funnel cloud, an approaching cloud of debris or a loud roar like a freight train.
  • Sign up for community warning systems and learn what your local sirens sound like.
  • Pick a safe spot, such as a safe room built to FEMA criteria or an ICC 500 storm shelter, and practice getting there.
  • Include your pets in the household emergency plan.
  • Keep supplies, food, water and medication in case you have to stay home for a long time.

During

  • Go right away to the safe place you picked in advance.
  • Protect your head and neck with your arms and stay away from windows, doors and outside walls.
  • No place in a car is fully safe. If you can get lower than the road, leave the car and lie down there.

Source: Ready.gov, tornadoes

Floods

Before

  • Check your flood risk with FEMA's Flood Map Service Center, and remember that floods do not follow map lines.
  • Sign up for your community's warning system. NOAA Weather Radio also broadcasts alerts.
  • Buy flood insurance through the NFIP well before a disaster. Homeowners policies do not cover flooding, and a new policy typically takes up to 30 days to go into effect.
  • Make a household plan with evacuation routes, shelter locations and what to do in a flash flood.
  • Keep important documents in a waterproof container and make password-protected digital copies.

During

  • If you are told to evacuate, leave right away and never drive around barricades.
  • Do not walk, swim or drive through floodwater. Six inches of moving water can knock you down.
  • If you are trapped in a building, go to the highest level, but do not climb into a closed attic.

Source: Ready.gov, floods

Questions people ask

Is Will County at risk of flooding?
FEMA rates inland flooding risk Relatively High in Will County compared with other US counties[13]. FEMA's Expected Annual Loss from inland flooding is $193.0 million a year[13].
Does Will County get tornadoes?
NOAA's tornado database records 93 tornadoes touching Will County from 1950 to 2024[4]. FEMA rates tornado risk Very High compared with other US counties[12].
Is Will County at risk of earthquakes?
FEMA rates earthquake risk Relatively Moderate in Will County compared with other US counties[16]. Its Expected Annual Loss is $7.1 million a year[16].
How many disasters have been declared in Will County?
OpenFEMA lists 17 federal disaster declarations for natural hazards that include Will County since 1967[2].
How do I check the flood zone of an address in Will County?
Look up the address in FEMA's Flood Map Service Center or ask the local floodplain manager[27]. County-level ratings do not tell you the flood zone of one address[27].

Facts and sources

  1. FEMA National Risk Index (version 1.20, December 2025): Expected Annual Loss from all 18 natural hazards in Will County is $348.1 million a year (Expected Annual Loss rating Relatively High, score 98.1). Of this, buildings account for $222.0 million, injuries and deaths (converted to dollars by FEMA) for $125.4... FEMA National Risk Index
  2. OpenFEMA Disaster Declarations Summaries list 17 federal disaster declarations for natural hazards that include Will County since 1967 (13 major disaster, 4 emergency or fire management). By incident type: severe storm 5, snowstorm 4, flood 4, tornado 3, hurricane 1. Biological (such as COVID-19) and other... OpenFEMA Disaster Declarations
  3. HazardFacts tally of OpenFEMA NFIP Redacted Claims (losses from 1978 to 2026): 2,295 National Flood Insurance Program claims were filed for losses in Will County, 1,881 of them with a payment, and NFIP paid $21.1 million in total (building, contents and increased cost of compliance, in dollars of the year paid).... OpenFEMA NFIP claims
  4. NOAA Storm Prediction Center tornado database (1950 to 2024): 93 recorded tornadoes touched Will County. The strongest were rated F5 (most recent of them on 1990-08-28). 6 were rated F3/EF3 or stronger. The most recent recorded tornado was on 2024-07-15. Ratings used the Fujita scale until early 2007 and the... NOAA Storm Prediction Center
  5. FEMA National Risk Index (version 1.20, December 2025): the overall natural hazard Risk Index rating for Will County is Relatively High, with a Risk Index score of 97.2 out of 100. The score is the county's percentile rank among all US counties. FEMA National Risk Index
  6. Among the 18 hazards in the FEMA National Risk Index (version 1.20, December 2025), the hazards with the highest hazard-type Risk Index scores for Will County are cold wave (99.6, Very High), tornado (99.2, Very High), inland flooding (97.8, Relatively High). HazardFacts sorted FEMA's published scores; FEMA's... FEMA National Risk Index
  7. FEMA's National Risk Index FAQ (December 2025): Expected Annual Loss is FEMA's estimate of the average economic loss in dollars from natural hazards each year. The index is not meant to predict how much damage a community will have in the next year, and a hazard can still cause damage where a rating is low. Scores... FEMA National Risk Index documentation
  8. HazardFacts sorted FEMA's hazard-type Expected Annual Loss values for Will County (National Risk Index v1.20): the largest are inland flooding ($193.0 million a year), cold wave ($72.3 million a year), tornado ($63.1 million a year), out of $348.1 million a year from all 18 hazards. FEMA National Risk Index
  9. FEMA National Risk Index (version 1.20, December 2025): Social Vulnerability rating for Will County is Very Low (score 13.3). FEMA describes social vulnerability as how susceptible social groups are to the harm natural hazards cause. FEMA National Risk Index
  10. FEMA National Risk Index (version 1.20, December 2025): Community Resilience rating for Will County is Very High (score 92.3). FEMA describes community resilience as a community's ability to prepare for, withstand and recover from hazards. FEMA National Risk Index
  11. FEMA National Risk Index (version 1.20, December 2025), cold wave in Will County: Risk Index rating Very High (score 99.6 of 100). Expected Annual Loss $72.3 million a year (rating Very High). Annualized frequency 4.3 event-days per year, from recorded occurrences over a period of record of 18 years. FEMA National Risk Index
  12. FEMA National Risk Index (version 1.20, December 2025), tornado in Will County: Risk Index rating Very High (score 99.2 of 100). Expected Annual Loss $63.1 million a year (rating Very High). Annualized frequency 0.62 events per year, from recorded occurrences over a period of record of 38 years. FEMA National Risk Index
  13. FEMA National Risk Index (version 1.20, December 2025), inland flooding in Will County: Risk Index rating Relatively High (score 97.8 of 100). Expected Annual Loss $193.0 million a year (rating Relatively High). Annualized frequency 3 event-days per year, from recorded occurrences over a period of record of 26 years. FEMA National Risk Index
  14. FEMA National Risk Index (version 1.20, December 2025), heat wave in Will County: Risk Index rating Relatively Moderate (score 95.5 of 100). Expected Annual Loss $8.5 million a year (rating Relatively Moderate). Annualized frequency 3.64 event-days per year, from recorded occurrences over a period of record of 18... FEMA National Risk Index
  15. FEMA National Risk Index (version 1.20, December 2025), winter weather in Will County: Risk Index rating Relatively High (score 92.1 of 100). Expected Annual Loss $617,000 a year (rating Relatively High). Annualized frequency 14.37 events per year, from recorded occurrences over a period of record of 18 years. FEMA National Risk Index
  16. FEMA National Risk Index (version 1.20, December 2025), earthquake in Will County: Risk Index rating Relatively Moderate (score 90.2 of 100). Expected Annual Loss $7.1 million a year (rating Relatively Moderate). FEMA's modeled annual frequency is 0.0015 events per year. FEMA National Risk Index
  17. FEMA National Risk Index (version 1.20, December 2025), lightning in Will County: Risk Index rating Relatively High (score 89.9 of 100). Expected Annual Loss $1.5 million a year (rating Relatively High). Annualized frequency 44.55 events per year, from recorded occurrences over a period of record of 24 years. FEMA National Risk Index
  18. FEMA National Risk Index (version 1.20, December 2025), ice storm in Will County: Risk Index rating Relatively Moderate (score 80.2 of 100). Expected Annual Loss $532,000 a year (rating Relatively High). Annualized frequency 0.93 event-days per year, from recorded occurrences over a period of record of 68 years. FEMA National Risk Index
  19. FEMA National Risk Index (version 1.20, December 2025), hail in Will County: Risk Index rating Relatively Low (score 60.5 of 100). Expected Annual Loss $498,000 a year (rating Relatively Low). Annualized frequency 3.89 events per year, from recorded occurrences over a period of record of 37 years. FEMA National Risk Index
  20. FEMA National Risk Index (version 1.20, December 2025), landslide in Will County: Risk Index rating Very Low (score 59.3 of 100). Expected Annual Loss $3,362 a year (rating Very Low). FEMA National Risk Index
  21. FEMA National Risk Index (version 1.20, December 2025), wildfire in Will County: Risk Index rating Very Low (score 56.2 of 100). Expected Annual Loss $88,000 a year (rating Very Low). FEMA's modeled annual frequency is 0.0003 events per year. FEMA National Risk Index
  22. FEMA National Risk Index (version 1.20, December 2025), strong wind in Will County: Risk Index rating Relatively Low (score 50.8 of 100). Expected Annual Loss $730,000 a year (rating Relatively Moderate). Annualized frequency 5.62 events per year, from recorded occurrences over a period of record of 38 years. FEMA National Risk Index
  23. FEMA National Risk Index (version 1.20, December 2025), drought in Will County: Risk Index rating Relatively Low (score 38.1 of 100). Expected Annual Loss $72,000 a year (rating Relatively Low). Annualized frequency 1.65 event-days per year, from recorded occurrences over a period of record of 22 years. FEMA National Risk Index
  24. FEMA National Risk Index (version 1.20, December 2025), hurricane in Will County: Risk Index rating Very Low (score 26.2 of 100). Expected Annual Loss $14,000 a year (rating Very Low). Annualized frequency 0.01 events per year, from recorded occurrences over a period of record of 172 years for the Atlantic Basin... FEMA National Risk Index
  25. FEMA National Risk Index (version 1.20, December 2025) rates these hazards Not Applicable for Will County: avalanche, coastal flooding, tsunami, volcanic activity. FEMA uses Not Applicable when its source data has no historical record of the hazard in the community and the hazard is not considered geographically... FEMA National Risk Index documentation
  26. NFIP Residential Penetration Rates (OpenFEMA, as of 2026-08-03): 1,026 residential flood insurance contracts were in force in Will County, out of 220,472 residential structures, a penetration rate of 0.5%. Inside FEMA's mapped Special Flood Hazard Area there were 3,291 residential structures and 747 contracts, a... OpenFEMA NFIP penetration rates
  27. FEMA's Flood Map Service Center is the official public source for flood maps (Flood Insurance Rate Maps) produced under the National Flood Insurance Program. Flood zones apply to specific properties: look up an address there or ask the local floodplain manager. County-level ratings do not tell you the flood zone of... FEMA Flood Map Service Center
  28. Most recent federal disaster declarations for natural hazards (table on this page). OpenFEMA Disaster Declarations

FEMA's National Risk Index compares each county with all other US counties. Ratings are relative (Very Low to Very High), not a measure of safety. Never call a place safe, unsafe, good or bad to live in. Risk Index and Expected Annual Loss values are FEMA estimates for planning. They do not predict next year's losses and do not apply to a single property. Flood zones are set by FEMA flood maps for specific properties. County ratings and flood insurance counts do not tell anyone whether an address is in a flood zone. Disaster declaration, NFIP and tornado counts are records of the past for this county only. Do not compare with other counties unless a fact does.

Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties, v1.20 (December 2025). Retrieved from fema.maps.arcgis.com on October 30, 2026. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.