Norwegian town tap water undrinkable after thaw releases heavy metals
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The gist
Thawing permafrost is releasing heavy metals into Longyearbyen's water, leaving the Norwegian Arctic town's tap water undrinkable.
Researchers say similar Arctic ground elsewhere could face the same risk.
Background
Longyearbyen is a former coal-mining municipality in Svalbard, Norway, one of the world's northernmost towns, about 800 miles (1,287 km) from the North Pole, with roughly 2,400–2,600 residents. It is one of the fastest-warming places on Earth, with temperatures rising five to seven times the global average. Melting permafrost exposes pyrite-bearing bedrock, which generates acid that leaches manganese, sulphate and nickel into waterways feeding Isdammen, the town's main drinking-water lake.
How it unfolded
- Sep 2025Local authorities warned Longyearbyen's 2,600 residents not to drink tap water after manganese was found at 25 times the Norwegian Institute of Public Health's limit of 50 micrograms per litre.
- Oct 19, 2026The Guardian reported that tap water in Longyearbyen is no longer drinkable because thawing permafrost is releasing heavy metals into the supply.
- Oct 20, 2026Circle of Blue's The Stream newsletter and Seoul Economic Daily reported the contamination, the latter citing the mayor's comments.
- date unknownThe council confirmed manganese levels had decreased for now, but sulphate and nickel levels rose and exceeded recommended limits; the drinking ban remains in place.
- date unknownSvalbard Brewery began supplying free drinking water produced by reverse osmosis, which the council says meets all safe-drinking-water requirements including smell and taste.
Who’s saying what
- Official
- Mayor Terje Aunevik said manganese had "increased explosively" and that it is hard for Norwegians, who take drinkable tap water for granted, to now carry water themselves; he urged other small communities to plan ahead.
- Expert
- Permafrost expert Marjolaine Verret said thawing permafrost plus pyrite-bearing shale bedrock produces acid that dissolves heavy metals into waterways, and that the same ingredients exist elsewhere in the Arctic, so this could be a first example of climate change hitting freshwater.
- Caution
- SINTEF research manager Hanne Kvitsand said it is not known for sure how water channels and quality will change as permafrost thaws, and that the issue needs thorough investigation.
Still unverified
Researchers believe the contamination stems from rapid permafrost melt exposing bedrock, but where Isdammen's water actually comes from is still being investigated by SINTEF scientists to confirm the source; Kvitsand said it is not known for sure how water channels and quality will change as permafrost thaws.