Abstract
Until the XXIst century, environment has always been set aside. It is true that before the industrial age, humans had no real impact on it. Thus, the question has appeared later when the governments of developed countries started to see the future consequences of the damage caused by our industries and our way of consumption on our planet. The question of water clearly appears as a priority in the protection of our environment. Firstly, we have to consider that water is crucial for human life and for all ecosystems around the world. In fact, it is a vital resource, used for the creation of food and moreover, it is essential for the wellbeing of our body. The human body is composed of 60% water, and it is indispensable to bring life and for humankind. If a person does not drink for six days, he will die. Secondly, it represents an important and inevitable economic resource. Actually, water is used in a large part to answer to industrial and agricultural needs. It is an integral part of the production process for numerous industrial sectors.
