Published on: January 13, 2026, 11:14 AM
The Public Service of Wallonia (SPW), the Walloon counterpart of Rijkswaterstaat, has filed a report against a company in the Liège region. The company is suspected of being involved in the discharge of the pesticide propamocarb into the Maas river.
Pollution of the Maas water
In early August 2025, the intake of Maas water for drinking water preparation was temporarily halted due to elevated concentrations of the substance propamocarb. This halt lasted, with interruptions, until early November 2025. Propamocarb is a pesticide used against fungi in horticulture.
The SPW indicates that after extensive investigation they were able to locate the pollution and have filed a report against a company in the Liège region. This has been forwarded to the public prosecutors office (Walloon Public Prosecutors Office).
So far, no significant elevated concentrations of propamocarb have been detected in the Maas.
Monitoring water quality
Rijkswaterstaat monitors the quality of river water. This is important from a public health perspective. Moreover, good water quality is one of the conditions for a healthy ecosystem. Want to know more about how we do this? Then take a look at the Aqualarm page.