Skip to main content
U.S. flag

An official website of the United States government

Rapid growth of the US wildland-urban interface raises wildfire risk

March 12, 2018

The wildland-urban interface (WUI) is the area where houses and wildland vegetation meet or intermingle, and where wildfire problems are most pronounced. Here we report that the WUI in the United States grew rapidly from 1990 to 2010 in terms of both number of new houses (from 30.8 to 43.4 million; 41% growth) and land area (from 581,000 to 770,000 km2; 33% growth), making it the fastest-growing land use type in the conterminous United States. The vast majority of new WUI areas were the result of new housing (97%), not related to an increase in wildland vegetation. Within the perimeter of recent wildfires (1990–2015), there were 286,000 houses in 2010, compared with 177,000 in 1990. Furthermore, WUI growth often results in more wildfire ignitions, putting more lives and houses at risk. Wildfire problems will not abate if recent housing growth trends continue.

Citation Information

Publication Year 2018
Title Rapid growth of the US wildland-urban interface raises wildfire risk
DOI 10.1073/pnas.1718850115
Authors Volker C. Radeloff, David P. Helmers, H. Anu Kramer, Miranda H. Mockrin, Patricia M. Alexandre, Avi Bar-Massada, Van Butsic, Todd Hawbaker, Sebastián Martinuzzi, Alexandra D. Syphard, Susan I. Stewart
Publication Type Article
Publication Subtype Journal Article
Series Title Proceedings of the National Academy of Sciences
Index ID 70201611
Record Source USGS Publications Warehouse
USGS Organization Geosciences and Environmental Change Science Center