the project water : property of humanity reminds us that ater is a resource necessary to all life. Beyond the fact that this resource is currently in danger because of its use and its waste, we want to organize actions with young citizens about its quality. Public or private water management requires technical know-how to ensure its distribution in good standing with the standards of public health agencies. Most of the time, citizens who are also customers and consumers have very few tools to ensure the good quality of the water from tap, mainly this resource is used for individual and household use. It is a participatory research project on the water that flows from the tap, that is used for drinking, washing, or cooking, i.e. the daily water: is it still good ? Studying the quality of the water can also be the starting point a general study on the management and use of water in areas subject to strong pressure on water resources ;both on a level of use than in the perspective of climate change.