Cyanobacteria in the Rommwiss in 2017; Credit: AGE

Luxembourg's Water Management Authority (Administration de la gestion de l'eau - AGE) has announced the lifting of the alert relating to the proliferation of cyanobacteria, more widely known as "blue algae", in the Upper Sûre Lake.

Following the proliferation of blue algae in this lake, which was accompanied by the presence of high concentrations of toxins produced by these cyanobacteria, the AGE has confirmed that the situation has improved significantly.

Seasonal changes in the climatology and hydrodynamics of the Upper Sûre Lake have led to a sharp decline in the biomass of cyanobacteria and the dissipation of blooms. Recent analyses carried out by the Luxembourg Institute of Science and Technology (LIST) have shown that the concentrations of cyanotoxins which can cause health problems in humans and animals have also dropped considerably.

This evolution of the situation thus puts an end to the alert relating to public health risks associated with the presence of blue algae.