The latest news from Eawag

Wastewater monitoring became well known during the coronavirus period from 2020, when Eawag and its partners began monitoring whether and which coronaviruses could be detected in wastewater throughout Switzerland. However, the researchers are now able to make far more statements about the health of the population because other pathogens and traces of medicines and drugs are also being monitored in parallel. The combination of data from both programmes opens up new perspectives.

By the end of the century, water temperatures in Swiss rivers will rise by up to 3.5 degrees if no action to protect the climate is taken. The rivers in the Alps are particularly affected. This is the conclusion reached by researchers from Eawag and the University of Basel in a research project funded by the FOEN.

The ETH Board appointed Daniel McCurry as a joint professor at EPFL and Eawag. The environmental engineer, who is currently still teaching in the USA, is already on sabbatical at Eawag. From summer 2026, alongside his teaching and research activities at EPFL, he will set up a research group that will also be active at Eawag.

To curb global plastic pollution and to make plastics safer and more sustainable, countries are currently negotiating a global treaty. A new study with participation from Eawag and Empa published in Nature provides a comprehensive and systematic overview of all chemicals that can be present in plastics, their properties, uses, and hazards. Moreover, the study also provides a scientific approach for identifying chemicals of concern. This allows scientists and manufacturers to develop safer plastics and policy makers to promote a non-toxic circular economy.

Two workshops on urban development and biodiversity with participants from research and politics show how cities can be designed to be biodiversity-friendly, inclusive and resilient.

After water is diverted for hydropower, rivers are often left with very little streamflow for nature. A new report provides an overview.

Microbial communities living deep underground in the groundwater of Lavey-les-Bains remain surprisingly stable throughout the year, even though the composition of the water changes seasonally. This is the finding of a study by Eawag researchers that contributes to a better understanding of geothermal systems and microbial life deep underground.

The Swiss Academies of Arts and Sciences have elected eight new members to the Swiss Young Academy, including Abishek Narayan, a Scientist in the Department of Sanitation, Water and Solid Waste for Development (Sandec) at the aquatic research institute Eawag.

Researchers from the Ecotox Centre, Eawag and the University of Applied Sciences Northwestern Switzerland have tested combined biological and chemical online monitoring as an early warning system at a municipal wastewater treatment plant. The system is able to detect peak loads of micropollutants in treated wastewater and identify toxic pollutants in real time. In this way, it can contribute to improving wastewater management.

A sudden drop in temperature in Lake Geneva over the Whitsun weekend is leaving swimmers feeling chilly: within a few days, the surface water temperature near the city of Geneva fell by around 8 degrees. This is due to a natural phenomenon that can be observed impressively on the Alplakes platform.

At its meeting of 21/22 May 2025 the ETH Board appointed Dr Thomas Hofstetter (*1969), currently Senior Scientist and Private Lecturer at ETH Zurich and Head of the Department Environmental Chemistry at Eawag, as Adjunct Professor in the ETH Department of Environmental Systems Science.

With its work, Eawag has made a decisive contribution to achieving a great deal for biodiversity in recent years. Water pollution from nutrients – one of the main causes of biodiversity loss – has decreased significantly in Switzerland, and the restoration of numerous Swiss lakes has improved the quality of habitats for many living organisms. Nonetheless, the challenges remain.

Tyre abrasion gets from the road into adjacent soils and affects soil organisms. A joint study by the Ecotox Centre, the aquatic research institute Eawag and the EPFL now shows that earthworms avoid soil that is heavily contaminated with tyre particles. However, the particles had no negative effects on the survival and reproduction of the animals.

The year 2024 was very warm and very wet, especially in early summer. This led to a welcome replenishment of groundwater reservoirs and record hydropower production, but also to severe flooding. In Bern, the focus was on the further expansion of hydropower and the pollution of water resources by pesticides and the "eternal chemicals" PFAS.

The diversity of whitefish species in Swiss lakes is unique and plays a central role in lake ecosystems. A comprehensive Eawag report now summarises the results of 150 years of research on these fish. They make it clear that the mechanisms and environmental conditions that have contributed to their development must be taken into account in order to preserve this species diversity. Last but not least, protecting whitefish diversity helps to preserve the natural yield potential of lakes as a source of food for humans.

Professor Urs von Gunten is one of the world's best-known scientists when it comes to the treatment of drinking water, in particular oxidation and disinfection processes. He has been conducting research at Eawag since 1989, with interruptions; from 2006 he was a titular professor at ETHZ, and from 2011 a full professor at EPFL. Now he is retiring. He retains a consultancy mandate... and the freedom to critically scrutinise the narrative of Switzerland's leading role in research.