Tap water no longer drinkable in Norwegian town as climate-related thawing releases heavy metals

Residents of Longyearbyen, a remote town in Norway, have been advised against drinking tap water due to heavy metal contamination linked to thawing permafrost. This town, located in the Svalbard archipelago, is one of the fastest-warming places in the world, with temperatures rising significantly due to climate change.

The primary drinking water source for Longyearbyen is a 1.5 mile-long (2.5 km) dammed lake known as Isdammen, or "ice pond." As temperatures rise, permafrost is thawing, exposing bedrock that leaches metals into the water supply. Longyearbyen is warming at a rate five to seven times faster than the global average, with autumn temperatures increasing by up to 4°C per decade.

Researchers attribute the heavy metal contamination to two main factors:

• The thawing of permafrost, which is the permanently frozen ground that only partially thaws in summer.
• The geology of the former mining town, particularly the presence of pyrite, or fool’s gold, in the shale bedrock.

Marjolaine Verret, a permafrost expert and associate professor at the University Centre in Svalbard, explained, "The acid produced can now leach heavy metals from these rocks into the waterways. The issue we’ve been having here in Longyearbyen is manganese, but other contaminants can be leached out from the rocks."