A very small percentage of water mains carrying drinking water to residents of Sault Ste. Marie have asbestos in them, PUC has confirmed. Although there is some debate on the subject, Health Canada has concluded that there is no evidence ingesting the substance is harmful to your health. Recently, an episode of the CTV television program W5 reported that asbestos-cement pipes are used in many municipalities across the country to deliver drinking water to residents.