Indicator Contaminated sites

Of the almost 17,800 sites needing investigation, the authorities were able to investigate and classify around 13,800 by the end of 2024. Of these, no further measures were necessary at nearly three-fourths of them. About 700 sites require periodic monitoring and currently a good 1,800 sites proved to be contaminated and require remediation. A comparison between the year 2024 and the year 2010 shows that the number of sites awaiting investigation has fallen significantly. Therefore, the state is assessed as good. If the pace of work cannot be stepped up, the goal of completing the investigations by 2032 will not be achieved. The trend is therefore assessed as unsatisfactory.

The remediation of contaminated sites will be largely finished in around 20 years. This means that over the next few years there will be a continuous reduction in the number of sites needing investigation. At the same time, the number of sites assigned to other categories will increase in the medium term as the sites that have been inspected are definitively classified. In the long term, the number of sites requiring monitoring and remediation will fall until the only sites remaining can be classified either as “no harmful or unwanted effects” or as “requiring neither monitoring nor remediation”.

• Related indicators
• Volatile halogenated hydrocarbons in groundwater

As the site classifications are specific to Switzerland, no international comparisons can be made for this Indicator.

Statistical evaluation of annual data from the registers for contaminated sites at canton and federal level (VBS, BAV, BAZL, FEDRO).