© Getty ImagesFirefighters try to contain the Lake County blaze, the worst of 21 major fires in California this year
The previous record of $1.67 billion, adjusted for inflation, was set in fiscal year 2002, U.S. Department of Agriculture communications director Matt Herrick said. (The Forest Service is part of the U.S.D.A.)
With the season nearly over, 9.8 million acres burned in 2015, the second-highest total since records began in 1960, according to the National Interagency Fire Center in Boise, Idaho. Only 2006, with 9.87 acres charred, had a higher total.
In addition, seven forest service firefighters died this year battling wildfires. Since 2000, on average, 18 firefighters have died each year fighting flames, the fire center reports.
Most of the fires hit the West and Alaska, which is typical. The size of the area burned this year is roughly equivalent to the states of Massachusetts and Connecticut combined.
Over the past 10 years, the Forest Service has spent $1.13 billion on average each year to fight wildfires. That amount does not include local or state costs to fight fires.
Nor does it include other federal agency firefighting costs. Agencies such as the Bureau of Indian Affairs, the Bureau of Land Management, the National Park Service and the U.S. Fish and Wildlife Service also chip in, though the Forest Service contributes the most.
Because of the cost of fighting fires, the Forest Service has been forced to tap other funds, such as forest-thinning projects, in order to keep up with the massive blazes, according to a report released by the agency in August.
The Wildfire Disaster Funding Act — a bipartisan effort that would have treated wildfires more like other natural disasters and ended the transfer of money from other programs to battle the blazes — did not make it into the federal budget released this week, though there are hopes it can be revived next year, Herrick said.
"The future trend will be hotter, longer, and more severe and ultimately more costly fire seasons, which directly impacts the Forest Service's ability to fund other critical work such as restoration that can reduce wildfire threat, drinking water area protection and recreation investments," Herrick said.
Comment: In the US, the 2015 wildfire season has already broken other records this year, whilst a study has shown that wildfire seasons are more destructive and lasting longer almost everywhere on Earth.