Water is connected to every forms of life on earth. As a criteria, an adequate, reliable, clean, accessible, acceptable and safe drinking water supply has to be available for various users. The United Nation UN and other countries declared access to safe drinking water as a fundamental human right, and an essential step towards improving living standards. Despite these facts, there are inequalities in access to safe drinking water in the world. In some countries, sufficient freshwater is not available physical scarcity ; while in other countries, abundant freshwater is available, but it is expensive to use economic scarcity.