The water supply in Ecuador had been influenced by their geography, the weather, the biodiversity, multiculturalism and the history. The paper uses an historic perspective and explore the most important facts of the water supply process since indigenous people from current time, which special focus in the regulation and normative facts. The documents concentrated its study in the three most important Ecuadorian cities, using a local government and subsidiary perspective, to try to demonstrate that even in a small country, there are different management models which have been adapted from different ideologies, and political and historic events. The paper has a special importance because it´s the first time which the water management use a different perspective, not only the classic (bicentralism from Quito and Guayaquil), because it includes the third city of the country.
