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Cook County, Illinois

Cook County, Illinois

Increasing risk| 23% of properties are at riski

Flood risk is increasing for Cook County.

As the environment and and weather patterns change, flood risks will increase. Approximately 310,024 properties are already at risk in Cook County, and within 30 years, about 320,958 will be at risk.

Change in number of properties at risk i

Total annual flood damages in Cook County i

This year 
In 30 years 
Damage breakdown by Flood Factor
This year ($)
In 30y ($)
Minor (2)
Moderate (3-4)
Major (5-6)
Severe (7-8)
Extreme (9-10)

Score Map

Flood Factors across Cook County.

A property's Flood Factor is an indicator of its comprehensive flood risk, ranging from 1 (minimal) to 10 (extreme). Properties with higher Flood Factors are more likely to flood.

Learn more about the Flood Factor methodology.

Filter by Flood Factor:

Number of properties at risk by Flood Factor

Number of properties at risk by Flood Factor

Flood Risk Explorer

Flood risks vary by depth and likelihood

Deeper floods from major events, like hurricanes, are less likely to occur, but cause greater damage than more shallow flood events, like heavy rains.

Select a projected flood risk:

More likely to occurArrow right
Arrow leftMore properties impacted

Approx. properties have a 0.2% chance of some amount of water reaching their building in 2021.


Depth of flooding (feet)

Approx. properties have a 0.2% chance of some amount of water reaching their building in 2021.


Depth of flooding (feet)

Note: 981,104 properties in this area are protected by adaptation. While the above projections take into account this protection, risks may substantially increase in the event of adaptation failure.

Environmental Changes

Flood risks are increasing because of the environment.

A changing environment means higher seas, new weather patterns, and stronger storms. As the atmosphere warms, there is more evaporation and more water available when it rains.

A warmer atmosphere also means warmer oceans, which can intensify flooding from hurricanes and offshore storms. Sea level rise also increases coastal flood risks, as higher seas mean there's more water available when high tides and coastal storms cause flooding.

Learn more about the environmental factors increasing flood risk.

Select year of projection

Change in extreme rain events compared to 1980-2010 average. i

Source: NASA Earth Exchange Global Daily Downscaled Projections (NEX-GDDP).

Rise in inches, compared to 1980-2010 average. i

+5 in.

Place with highest sea level rise (inches)

14.4Grand Isle, LA
10.3Galveston Pier 21, TX
9.4Ocean City Inlet, MD
9.1New Canal Station, LA
8.7Lewisetta, VA
Source: Kopp et al, 2017. Evolving Understanding of Antarctic Ice‐Sheet Physics and Ambiguity in Probabilistic Sea‐Level Projections.

Temperatures in degrees Fahrenheit. Increase in comparison to the 1980-2010 average. i

Source: NOAA National Data Buoy Center and Schmidt et al, 2014., Configuration and assessment of the GISS ModelE2 contributions to the CMIP5 archive.

Community Solutions

There are solutions to protect this area.

Communities that adapt to higher risks can limit damage and lower flood insurance costs. Cook County is already investing in flood risk reduction projects, but more may be needed. Learn more about solutions.

Known adaptation measures i
Properties protected by adaptation i

Green infrastructure is a cost-effective and sustainable flood management approach that gathers and removes water at its source.

  • Open Spaces
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    By providing space for managed flooding, communities can reduce the flood risks for homes and businesses. These spaces can include cemeteries, golf courses, and parks.

  • Marshes and Wetlands
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    Restoring or constructing new marsh or wetlands provides areas for water to be stored, therefore reducing flooding.

  • Rain Gardens and Bioswales
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    Rain gardens reduce flash flooding by collecting rainwater and allowing time for the water to be absorbed or carried away. Bioswales are larger but functionally similar, and usually a part of a larger stormwater drainage system.

  • Beach Dunes and Renourishment
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    Beaches and dunes work as natural walls to reduce the impact of storm surges. Adding sand to make beaches bigger helps limit coastal erosion and protect communities from flooding.

  • Natural Barriers
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    Restoring and building up natural infrastructure such as barrier islands, oyster and coral reefs, mangroves, seagrass, and salt marshes is a cost-effective and eco-friendly way to reduce flood risks.

Find your home's Flood Factor

Past floods, current risks, and future projections based on peer-reviewed research from the world's leading flood modelers.

Powered by the world's top flood risk modelers

Access data calculated by a team of more than 80 world-renowned experts using decades of peer-reviewed research.

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Over 142 million properties, neighborhoods, and cities analyzed

View any home's Flood Factor and understand what can be done to protect it from flooding.

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First of its kind flood model shows how risk changes over time

Explore interactive flood maps to visualize recreated historic floods and see how flood risks change in the future.

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