State of lakes

Nutrient loads in Swiss lakes have been reduced since the 1980s due to intensive efforts to protect bodies of water. Although water quality has improved, several lakes are still over-fertilized. In addition, many ecologically important sections of shore are affected: Control structures reduce the quality of the habitats of plants and animals.


The FOEN measures the current water levels of Swiss lakes, makes predictions and informs the public.


The development of wastewater treatment and the application of new wastewater technologies, not to mention agricultural measures, have substantially lowered nutrient and pollution loads in lakes. However, there is increasing pollution from synthetic organic trace compounds that are not readily biodegradable.

Further information

Last modification 15.11.2019

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