Floodplain status is now included in Cook County Property Assessments

Monday, September 16, 2019

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The Cook County Assessor’s Office recently added FEMA floodplain data to its assessment models. What this means: our Office is now able to quantify how much a home’s property value is affected by being on a floodplain, and can use that information to produce more accurate property values for homes that are and aren’t on a floodplain.

To explain this change to staff, we sent the following note. In the interest of transparency and providing additional information to the public about our work, we are posting the note publicly below. For more information click 


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