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6) Tap water is strictly regulated by Health Canada and the provinces and territories, whereas bottled water is not.
The Guidelines for Canadian Drinking Water Quality spell out the maximum levels of potentially harmful substances that are allowed in drinking water and municipalities test their water sources constantly to make sure they are within these limits. Because bottled water is classified as a food, it falls under the Food and Drugs Act and is not subject to such strict guidelines.

In the same research mentioned above on micro plastics, the research team tested for micro plastic particles in tap water from more than a dozen countries across five continents. They found that bottled water had double the amount of micro plastics than the tap water.