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The process results in minerals being exposed to air and water for the first time, causing a release of acid, sulfate and a mixture of metals.After studying six different watersheds, the scientists discovered \u201cconcentrations of nickel, zinc, and cadmium similar to those observed in mine-impacted rivers outside the region.\u201d There are still many mysteries regarding the environmental implications, but scientists noted the six rivers\u2019 water chemistry substantially changed in tandem with warm weather in the region.\u00a0\u00a0\u201cThis is very acidic, metallic water,\u201d said senior author Brett Poulin, a UC Davis professor in the Department of Environmental Toxicology, in a Sept. 24\u00a0article published by the university. While \u201cthere is some resiliency in this system,\u201d Poulin continued, \u201cthere are metals that increased downstream, and those can be transported very long distances.\u201d\u00a0Article continues below this adThese metals also became more toxic the further they traveled downstream: Concentrations were 70 times higher 60 miles away from their entrance point, the UC Davis article says. As of 2025, over 200 rivers and streams in the Brooks Range region have been potentially affected by this recent phenomenon.\u201cThis was a process that was not forecast, predicted or included in any assessment of how the Arctic will change under a warmer climate, but we\u2019re seeing it in rivers across the Arctic,\u201d Poulin told the university.\u00a0It\u2019s still unknown whether acid rock drainage in these waterways has a negative impact on rural communities and ecosystems, but scientists are continuing to monitor them.\u201cConcerns and hopes are the big takeaways,\u201d Taylor Evinger, an author of the study, told UC Davis. \u201cWhile we are not seeing massive fish die-offs, and we\u2019re not aware of drinking water quality issues currently harming villages, the numbers of observations are still concerning.\u201dArticle continues below this adEvinger pointed out hundreds of watersheds have signs of acid rock inputs even though they are untouched by industrial activity.\u201cIt\u2019s a new reality of climate change,\u201d Evinger said in the article.Sep 25, 2026Ariana Bindman is the news features reporter at SFGATE, where she has reported and written features and breaking news stories for news, local, culture, travel, sports, food and politics verticals since January 2022. 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As of 2025, over 200 rivers and streams in the Brooks Range region have been potentially affected by this recent phenomenon.\u201cThis was a process that was not forecast, predicted or included in any assessment of how the Arctic will change under a warmer climate, but we\u2019re seeing it in rivers across the Arctic,\u201d Poulin told the university.\u00a0It\u2019s still unknown whether acid rock drainage in these waterways has a negative impact on rural communities and ecosystems, but scientists are continuing to monitor them.\u201cConcerns and hopes are the big takeaways,\u201d Taylor Evinger, an author of the study, told UC Davis. \u201cWhile we are not seeing massive fish die-offs, and we\u2019re not aware of drinking water quality issues currently harming villages, the numbers of observations are still concerning.\u201dArticle continues below this adEvinger pointed out hundreds of watersheds have signs of acid rock inputs even though they are untouched by industrial activity.\u201cIt\u2019s a new reality of climate change,\u201d Evinger said in the article.Sep 25, 2026Ariana Bindman is the news features reporter at SFGATE, where she has reported and written features and breaking news stories for news, local, culture, travel, sports, food and politics verticals since January 2022. 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