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GAO-20-633R 1 (2020-09-10)

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GAOU.S. GOVERNMENT ACCOUNTABILITY OFFICE
441 G St. N.W.
Washington, DC 20548



September 10, 2020


The Honorable Gary C. Peters
Ranking Member
Committee on Homeland Security and Governmental Affairs
United States Senate

The Honorable Marco Rubio
Chairman
Committee on Small Business and Entrepreneurship
United States Senate

The Honorable Peter A. DeFazio
Chairman
Committee on Transportation and Infrastructure
House of Representatives
The Honorable Sheila Jackson Lee

House of Representatives

Natural Disasters: Economic Effects of Hurricanes Katrina, Sandy, Harvey, and Irma

Between January 1980 and July 2020, the United States experienced 273 climate and weather
disasters for which the National Oceanic and Atmospheric Administration (NOAA) estimated
damages costing $1 billion or more each.1 NOAA estimated that the total cost of damages from
these disasters exceeded $1.79 trillion and attributed over 50 percent of these costs to
hurricanes and tropical storms. The Congressional Budget Office (CBO) estimated that federal
disaster assistance covered, on average, 62 percent of the costs across the regions affected by
these hurricanes for calendar years 2005 through 2015.2 GAO has reported that the rising
number of natural disasters and reliance on federal disaster assistance is a key source of
federal fiscal exposure.3

You asked us to review the costs of natural disasters and their effects on communities. This
report examines (1) estimates of the costs of damages caused by hurricanes and hurricanes'



1NOAA adjusts their damage estimates for inflation, and these estimates are expressed in 2020 dollars. Dollar
amounts for cost of damages are drawn from NOAA National Centers for Environmental Information (NCEI) U.S.
Billion-Dollar Weather and Climate Disasters (2020), accessed July 14, 2020, https:/Iwww.ncdc.noaa.gov/billions/,
DOI: 10.25921/stkw-7w73.
2Congressional Budget Office, Potential Increases in Hurricane Damage in the United States: Implications for the
Federal Budget (June 2016), 22.
3GAO, The Nation's Fiscal Health: Action Is Needed to Address the Federal Government's Fiscal Future, GAO-20=
403SP (Washington, D.C.: Mar. 12, 2020), 34.


GAO-20-633R Economic Effects of Hurricanes


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