Despite having one of the most important water stress in Europe, Spain and Italy are the countries where water is the least expensive. Sometimes cities have to take the lead, that’s the ambition of the C40 cities do, lead by Anne Hidalgo, the current Mayor of Paris. It is especially essential in 2017 when the most severe drought of the century is hitting Spain and Portugal. Cities such as Singapore are looking into innovation and behavioural changes for decreasing the demand of water: 20 000 devices such as HYDRAO shower will be installed in new flats from 2017.