The water shortage expectation in a near future proves that the world population must be mobilized, as soon as possible, to face the problem of the water waste in daily activities. This paper presents the development of a web serious game to teach children about that problem which is already affecting lives of many people around the world. It is believed that education could be the better tool to change cultural habits and, in this way, the bigger awareness and a best use of hydric resources. To validate the proposed game, quantitative tests, based in data mining, and qualitative tests, based in questionnaire, were performed.