Sufficient and clean fresh water is vital. Still, it can’t be taken for granted. Through agricultural intensification, population growth and widespread prosperity, the use of clean fresh water is increasing. Moreover, groundwater and surface water are coming under greater pressure from pollution, such as nutrients, pesticides, medicines and other micro-pollutants. In addition, climate change is leading to new dynamics in evaporation and precipitation, resulting in periods of drought and flooding. This requires sustainable and future-proof water management, ensuring sufficient clean fresh water for drinking, nature, agriculture, recreation and industry.