The countries with the purest potable water are going to be the ones whose major water source is glacial runoff and snowmelt. These sources are essentially 100% pure (nothing's perfect of course), and will only contain any contaminants that they get through surface sources or aquifers. At high altitudes, such as Switzerland, Nepal, and others, their rock is fairly pure, not "contaminated" with natural source minerals such as iron, salt, arsenic, sulfur, or radon, that are common at the lower elevations. Incidentally, iron and salts are not harmful unless the occur in high concentrations in the water that is eventually used as drinking water.
Additionally, these high-altitude countries have very few artificial contaminants that may be introduced through industry or agriculture.
Scandinavia and Iceland have fairly pure water, depending on the exact source of the water that you're drinking in each city or region. Again though, these may be contaminated by artificial poisons, even it if's simply particular matter and chemical runoff, as you'd find on Iceland, which has some of the world's largest aluminum smelters (three of them). Northern Scandinavia has been polluted by radioactive fallout from Soviet, and then Russian nuclear testing.
· 10 years ago