The City of Iqaluit says that investigators have found a historic fuel spill beside the water treatment plant that may be the source of contamination in its water supply, according to Nunatsiaq News.

The historic fuel spill is described as being in “an inaccessible, below-ground void” beside the water treatment plant.

A firm has been hired to “manage the spill and remove it from site,” the city’s statement said.

On Oct. 12, the city and the Government of Nunavut Health Department told people in Iqaluit not to drink the tap water from the municipal water supply because it was suspected it had been contaminated with fuel.