The Iqaluit water plant was shut down Wednesday to allow staff to inspect the facility to find the source of recurring fuel contamination of the city’s water supply, according to Nunatsiaq News. Nunavut’s Health Department put a boil water advisory into effect shortly afterwards.

The city is currently pumping water from the Lake Geraldine reservoir through a bypass pipe that avoids contact with the tanks at the treatment plant.

When the city announced the shutdown of the plant, it said in a statement that a “breach” had been discovered in the plant that was believed to be the source of the previous week’s fuel contamination.

City spokesperson Stephanie Clark similarly said she couldn’t offer a timeline for when the water treatment plant will be working again.