Try to imagine our lives without water: we could not drink, eat or wash ourselves. There would be no plants and animals, no rain, no seas, rivers, lakes… In short, without water, life on Earth would not exist. This is why the United Nations has decided to hold World Water Day, every year on 22 March. It is a day instituted by the United Nations General Assembly in 1992, following the Rio Conference, to commemorate the importance of this resource that is so essentilal for life. The theme chosen for World Water Day 2021 is “Valuing Water”: water is of immense value, far greater than the price we pay to use it. Water is of enormous value to humans; it is linked to food, culture, health, education, the economy and the integrity of the natural environment. If we neglect any of these values, we risk mismanaging this finite and irreplaceable resource.