The price of tap water includes the costs of its treatment, its delivery to consumers and its processing after use.
The price of bottled water is much higher as it takes into account the manufacturing, the transport and the eventual recycling of the bottles, as well as its marketing costs.
The worldwide consumption of bottled water is increasing by more than 10% a year on average. This phenomenon, damaging for the environment, is hard to explain, notably in the industrial countries where bottled water is often not safer than tap water. It is essentially the result of efficient promoting strategies developed by the private protagonists of the water market.