From the Document: "The U.S. Department of Agriculture's Forest Service (FS) and the Department of the Interior (DOI) are responsible for wildfire response and management across the federal lands within their respective jurisdictions. Both FS and DOI generally receive annual discretionary appropriations for wildfire management activities through the Interior, Environment, and Related Agencies appropriations bills. Wildfire management funding for DOI is provided to the department-level Office of Wildland Fire. Wildfire management appropriations fluctuate annually but began to increase in the late 1990s and rose markedly after FY2000. A significant portion of the annual fluctuations and overall increase in funding is related to fire suppression costs, which vary considerably and may be high even during years of relatively mild wildfire activity."
CRS In Focus, IF11675
Congressional Research Service: https://crsreports.congress.gov/