There are concerns about security at the Atwater filtration plant, where drinking water for more than two million Montrealers is processed.
A broadcast report last week suggested there are serious issues with the facility's high-tech system of security cameras and motion detectors.
It seems out of the 75 security cameras that have been placed around the facility, only six are actually functional.
The issue was raised at Monday's city council meeting, where opposition leader Richard Bergeron pointed out that "by comparison, I'd like to point out that even the most modest of Couche-Tard depanneurs have two cameras at the beer fridges, two cameras at the payment counter...six cameras in all".
Mayor Denis Coderre says it's news to him.
"It's unacceptable," he told council. "If that's the situation, we have to fix it immediately."
He added there should be zero tolerance when it comes to potential security breaches.
Chantal Rouleau, the executive committee member responsible for water infrastructure, blames the problem on a system glitch.