Grey Bruce Public Health Agency has advised Hanover residents to boil their water because test results identified contamination.
It did not identify the contaminant.
Mayor Sue Paterson said "the town’s first priority is ensuring the safety of our water supply.
“Our internal municipal water treatment systems are working as intended which prompted us to issue the precautionary boil water advisory for the safety of our residents, out of abundance of
caution.
“I know this causes concern for our residents. I kindly ask for your patience as we await the lab results."
In May, 2000, the water supply in nearby Walkerton was contaminated with E. coli 0157, sickening about 2,000 people and seven died.
The Hanover advice is to bring water to a rolling boil for at least a minute.
