If you stood on the banks of the Cache la Poudre River in Colorado after the 2020 Cameron Peak Fire, the rumbling water may have appeared black. This slurry of ash and charred soil cascaded toward the reservoirs that supply drinking water for the downstream city of Fort Collins, home to around 170,000 people. Although the water looked clear again several weeks later, Charles Rhoades, a research biogeochemist at the US Forest Service Rocky Mountain Research Station, says he is still seeing contaminants from the fire in the watershed. Recent studies have found that while some watersheds begin to recover within five years of a fire, others may be fundamentally altered, never fully returning to their pre-fire conditions. And with wildfires becoming more common, much larger, and burning for longer as the world warms, hydrologists, ecologists, and water-management officials are scrambling to understand and mitigate the consequences fire-contaminated water can have on humans and ecosystems.

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