Houston flood risk may hit twice as many homes as FEMA maps show
About twice as many Harris County residents could be forced to buy flood insurance under new FEMA maps, with Greenspoint to Kashmere Gardens in the path.
About twice as many Harris County residents may soon be required to carry flood insurance under new FEMA maps, with the affected area stretching from Greenspoint to Kashmere Gardens. The draft maps also indicate Harris County’s 100-year floodplain could grow by 43%.
Most homeowners insurance does not cover flood damage. FEMA’s Flood Map Service Center warns that people in low or moderate flood-risk areas are still five times more likely to experience a flood than a fire. In a county where heavy rain, bayou overflow, subsidence, and sprawling pavement can overwhelm drainage, a narrow map line can leave households exposed to damage they did not plan for and could not afford.
On Sept. 30, 2020, Rice University’s Kinder Institute for Urban Research called FEMA flood maps outdated and inaccurate and said they did not fully capture risk. By July 7, 2021, the institute said that despite increasing risk in Harris County, more people were living in flood plains. The University of Houston’s Understanding Houston project found that 55% of homes damaged in the 2016 Tax Day Flood were outside the 500-year zone, and one-third of homes damaged during the Memorial Day Flood also fell outside that boundary.
On May 26, 2026, Rice researchers found that northern parts of Harris County would see the biggest impact from the proposed FEMA maps. They also found that for every square mile of land removed from Harris County’s floodplains, roughly four square miles were added.
Those shifts come as Harris County continues to rely on a layered flood-response system that includes the Harris County Flood Control District, created by the Texas Legislature in 1937 and governed by Harris County Commissioners Court, along with MAAPnext, the county’s flood education mapping effort. A 2026 Houston Chronicle project found that a little-known FEMA appeal process removed thousands of wealthy Harris County homes from floodplains, and that the exemptions often did little more than lift the mandatory flood-insurance requirement.
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