你说的对,加拿大水质是第一的.从如下网站资料可以看出
http://www.toronto.ca/water/faq.htm#a002
Is my tap water safe to drink?
Yes!
To ensure the purity of our water, we test the water continuously during and after treatment. In fact, we conduct more tests and on many more substances than required by regulation. At the City of Toronto, we take drinking water samples every four to six hours to confirm the absence of bacteria.
We use only the necessary chemicals to treat the water, including chlorine, to kill E.coli and other bacteria that may be present. A tiny (and harmless) amount of chlorine is left in the water to ensure its continued safety as it travels to you.
If we are concerned about the quality of water, we immediately notify Toronto's Medical Officer of Health and the Ministry of the Environment.
What is the best choice of drinking water: bottled or tap water?
The answer is clear: tap water!
That's because our water is:
- of excellent quality
- strictly monitored
- affordable.
When we look at issues such as quality, monitoring and affordability, we see that bottled water doesn't always make the grade. For instance, some brands may be of excellent quality, but others can have inferior bacteriological quality. And all bottled waters are expensive. Another important fact: there are fewer government regulations to guide the bottle water industry. While bottled waters should meet the Guidelines for Canadian Drinking Water Quality, monitoring requirements aren't as stringent as are those for tap water.
For quality, consistency and affordability, tap water wins every time.
What is Toronto's 'water hardness' and how does it affect me?
Toronto's water hardness is usually between 106 to 127 parts per million (the average for 2009 was 120 milligram/litre or 8.4 grains/imperial gallon). Lake Ontario water is considered 'moderate' terms of water hardness. There are no harmful health effects associated with these minerals (in fact, some believe they are beneficial), but measuring them does provide a guideline as to how water use may be affected. For example, hard water does result in more scale buildup and you need to use more soap and detergents.
If you choose a water softener, it's recommended that a separate, unsoftened supply of water be kept for cooking and drinking.
Also, when you buy a new appliance, such as a dishwasher, the manufacturer often makes reference to water hardness. This is because hard water can cause automatic dishwashers to leave film on dishes and build-up of minerals on mechanical parts. It may also cause washing machines to leave residue on articles of clothing. If you have this problem, check your user manual on available solutions.