UO Study finds wildfires can turn soil nutrients into toxic metals

EUGENE, Ore. (KTVZ)-- New research from the University of Oregon has uncovered a hidden and potentially dangerous side effect of wildfires — the ability to turn naturally occurring nutrients in soil into toxic, cancer-causing metals.

Scientists found that extreme heat from wildfires can convert chromium, a common micro-nutrient in Pacific Northwest soils, into a harmful chemical form that can leach into groundwater. Lab tests showed the highest concentrations formed at fire temperatures between 750 and 1,100 degrees.

Researchers say the study underscores the need for expanded soil and water testing after wildfires, especially as blazes in the region grow more frequent and severe.

The findings suggest that beyond visible burn scars and air pollution, wildfires may also leave behind long-term contamination risks hidden underground.