If you have a private well, test it for arsenic. Your provincial or territorial health and environment ministries can tell you how to do this. If your arsenic level is above 0.01 milligrams per litre (0.01 mg/L) or 10 micrograms per litre (10 µg/L), stop drinking from the well and take steps to reduce the level of arsenic.
You can get information about reducing the arsenic levels in residential water treatment systems from Health Canada or the National Sanitation Foundation (US).
The Canadian Cancer Society does not recommend using bottled water over tap water unless your tap water contains high levels of arsenic. There is no evidence that bottled water is safer than tap water. In fact, there is a proposal to update the current regulations for bottled water so that they are similar to the guidelines for tap water, which are based on more current scientific information. Other bottled drinks are regulated in a similar way.
If your water is contaminated with arsenic, bottled water can be a substitute source for water until the arsenic problem is resolved. To find out more on bottled water safety, see Health Canada’s website.