Does tap water contain dissolved oxygen and nitrogen; does it contain ionic solutes?

Tap water typically contains dissolved oxygen and nitrogen, primarily from aeration during treatment processes. Additionally, tap water may contain various ionic solutes, such as calcium, magnesium, sodium, chloride, and sulfate, depending on the source and treatment methods used by the water utility.

The source of tap water is a reservoir that is conveniently situated in a higher altitude than the destination tap in the neighborhood. (If it weren't higher, the water wouldn't flow out of the tap!) Because the reservoir is open to the atmosphere, some atmospheric gases will dissolve in the water and this is dependent on the water's temperature.

In addition to ions, tap water also contains dissolved gases, such as carbon dioxide, nitrogen, and oxygen. In certain regions of the world (which you will discover when you travel), the tap water tastes particularly good—I'm thinking of the Pacific North-west of the United States and Canada—and in other regions, like Engerland, the tap water tastes less than great. However, in both regions, tap water contains oxygen and nitrogen—concentrations of which can be measured.