Thawing permafrost leaves an Arctic town in Norway unable to drink its tap water
Scientists say the contamination in Longyearbyen, on Svalbard, could preview what other Arctic communities face as the ground thaws.
Residents of Longyearbyen, a town of about 2,600 people on Norway's Svalbard archipelago, have been told not to drink their tap water after heavy metals linked to thawing permafrost contaminated the main supply, Karen McVeigh reported Monday in the Guardian.
The town draws its water from Isdammen, a dammed lake about 2.5 kilometers (1.5 miles) long. As permafrost thaws, newly exposed shale bedrock containing pyrite reacts with water and oxygen, producing acid that leaches metals into the lake, said Marjolaine Verret, an associate professor in Arctic geology at the University Centre in Svalbard. Longyearbyen is warming five to seven times faster than the global average, with autumn temperatures rising by up to 4 degrees Celsius per decade.
The municipality first warned residents in September 2025, when manganese in the water reached 25 times the 50 micrograms per liter recommended by the Norwegian Institute of Public Health. Manganese levels have since fallen, but sulfate and nickel exceeded drinking-water limits earlier this year, so the ban remains. Residents refill containers with free water, purified by the local brewery, at the supermarket.
Mayor Terje Aunevik said the town may need a completely new water supply, such as a filtration system with a backup desalination plant, options he called "extremely expensive." "In Norway, where we have always taken for granted that we can drink the water from the tap, it is challenging to start thinking that we need to carry our water like we do now," he said.
Verret said the same mix of pyrite-rich bedrock and thawing permafrost exists elsewhere in the Arctic, warning that Longyearbyen "could be a first example of how climate change can impact freshwater, for example in northern Canada and Alaska."
This brief is based on an article published Oct. 19, 2026, by Karen McVeigh in the Guardian. Read the original: https://www.theguardian.com/environment/2026/oct/19/tap-water-no-longer-drinkable-norwegian-town-climate-related-thawing-heavy-metals-arctic-longyearbyen-svalbard
This article was produced with the assistance of AI tools and reviewed by an editor before publication.
