Climate & Disasters · Report · File No. 261113-044
Record wildfire year burns 9.5 million acres, and burn scars threaten drinking water
More than 9.5 million acres have burned in the U.S. in 2026, and new studies say wildfire contamination of drinking water sources can last up to eight years or longer. Small towns can face months of costly workarounds.
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A record number of wildfires has burned more than 9 million acres in the United States this year, and the damage did not end when the flames went out. Burned hillsides now threaten the streams and rivers that supply drinking water to much of the country 1. So far in 2026 there have been 68,179 fires covering more than 9.5 million acres, or 3.8 million hectares 1.
Scientists say rain carries ash and burned plant matter into streams that feed water treatment plants. New studies show the contamination could last more than a decade 1. One University of Colorado Boulder study of hundreds of burned basins found impacts lasting up to eight years 1.
Why treatment plants struggle
Plants that draw from rivers and streams usually treat high-quality water, because trees and soil act as a natural filter 1. Fires cause spikes in heavy metals and dissolved organic matter that those plants were not built to handle 1. Forested watersheds supply water to nearly two-thirds of U.S. municipalities, according to the Colorado study's lead author, Carli Brucker 1.
There is also a health concern. When chlorine meets the organic matter left by fires, it forms byproducts that the U.S. Environmental Protection Agency regulates because they can cause illnesses, including cancer 1. Plants cannot remove those byproducts, so they must clear out the organic matter first, which can delay the water supply 1.
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A New Mexico town still waiting
The city of Las Vegas, New Mexico, went without water for months after the 2022 Hermit’s Peak/Calf Canyon fire contaminated the Gallinas River 1. In the four years since, it has handed out bottled water and trucked in tanks from nearby towns while raising money for a new treatment plant 1.
Karen Pettine, who has owned the Hillcrest Restaurant for 50 years, said the crisis forced her to close, sometimes for a week at a time 1. Mayor David Romero said climate change has made once-reliable things less predictable 1.
It’s a scary situation that we’re all going to encounter
The problem is spreading across the West
A study in the journal Nature, reported Oct. 1, looked at more than 17,000 watersheds in 11 Western states 2. In areas serving more than 100,000 people, the average share of land burned each year rose from 4.7% to 9.1% 2. Forested lands supply more than half the surface drinking water used by nearly 83 million people in the region 2.
After a fire, we usually see increased water quantity and decreased water quality
The study also notes that much of the West's major water infrastructure dates to the mid-20th century, before these changes. It was designed assuming relatively stable water conditions 2. Researchers point to prescribed burns, restoring streamside vegetation and better real-time monitoring as ways to reduce the risk 2.
What happens next
Utilities are asking experts for help finding other water sources or ways to treat the incoming organic matter 1. Fixes can be expensive and slow. In 2020, Glenwood Springs, Colorado, got an $8 million emergency state loan within two months of a fire to upgrade its treatment system 1.
That matters because the cost of these repairs falls first on local water bills and town budgets. The sources do not say how much federal help is available, and that question will matter as more burn scars sit above more water plants.
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Sources
- ABC News, “Bigger and more-frequent wildfires threaten water supplies across the US” (2026-11-13). abcnews.com/US/wireStory/bigger-frequent-wildfires-threaten-
- KUNC / Mountain West News Bureau, “Western water threatened by wildfires, new research” (2026-10-01). kunc.org/2026-10-01/western-water-threatened-wildfires-new-r
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