The problem of water stress and water quality is one of the main environmental issues in Europe, together with climate change, air quality, biodiversity and soil quality. With respect to water quantity, withdrawal of water resources in Europe is above 20% of renewable freshwater resources. The major pressures on water quantities occur during summer in southern countries because of irrigation demand and tourism activities. In the coming decades, the likely increase of withdrawals and climatic change will result in more intensive pressures on water quantities in these southern countries.