80% of Switzerland's drinking water comes from groundwater. Its protection is becoming increasingly difficult, especially in the densely utilised Central Plateau. New or newly focussed pollutants such as PFAS are raising questions. Higher water temperatures and longer periods of drought as a result of climate change are exacerbating the situation.
Can suppliers continue to supply consumers with virtually untreated groundwater under these circumstances? Why have problems that have long been recognised, such as nitrate pollution, still not really been solved? Eawag researchers addressed such questions at the Eawag Info Day on 4 September 2025. They presented results and tools that support practitioners and administrators in safeguarding the quality and quantity of drinking water resources. We summarize the most important content in this Eawag Special.
