Manitouwadge, Ont., is under a boil water advisory.
According to a public notice posted on the community's website, the township put the advisory in place on June 11 due to a "mechanical failure." A backup generator failed during a planned power outage, public health officials in Thunder Bay said, which caused a loss of pressure in the system.
"Any time there's a loss of pressure in a system like that, there is the chance of contaminants entering the system," Abby Mackie, a senior public health inspector with the Thunder Bay District Health Unit told CBC News on Monday.
The advisory will remain in place until officials are "satisfied that the drinking water system is capable of providing a safe water supply," the notice said.
Mackie added it will likely remain in effect until at least Wednesday.
The township is advising all residents that water that is to be consumed by people or pets should be brought to a rapid rolling boil for one minute.