Here is a good FAQ on bottled water from Health Canada.
Questions and answers on bottled water
Quote:
Why has there been such an increase in the consumption of bottled water?
This is a matter of personal taste and preference for bottled water over municipal tap water. Survey results have also shown that consumers are concerned about the quality (chemical pollutants) of drinking water in Canada. Some people think that bottled water is safer than municipal tap water, but there is no evidence to support this.
Can drinking water cause illness?
Bottled water can also contain these contaminants. However, illness caused by bottled water is very rare in Canada because it is treated, disinfected and monitored to ensure the absence of harmful organisms. To the best of our knowledge, no waterborne disease outbreaks have been associated with the consumption of bottled water in Canada. Published reports have shown that in countries where manufacturing practices are not as strict as in Canada, improperly manufacturedbottled water has led to outbreaks of cholera and typhoid, and to "Traveller's Disease".
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So far the jury is still out on whether or not it is better or worse for you, but it definitely cost a lot more.