Swimming Prohibited at Rommwiss Beach Due to Blue Algae

Luxembourg's Water Management Authority has announced that swimming is currently prohibited at Rommwiss beach in Boulaide due to the presence of blue algae.

As part of regular monitoring of the quality of bathing water, a significant proliferation of cyanobacteria, also known as "blue algae", was discovered in the Upper Sûre Lake, near Rommwiss beach.

Given the health risks, the authorities have issued a swimming ban with immediate effect for Rommwiss beach in accordance with the 2009 amended Grand Ducal regulation determining special protection measures and monitoring programmes for the state of bathing waters.

The Water Management Authority noted that certain species of cyanobacteria produce toxins which can pose a health risk for humans, aquatic fauna, domestic animals and livestock. As a result, the Luxembourg Institute of Science and Technology (LIST) was mandated to monitor cyanobacteria in bathing water in the Grand Duchy. These analyses on Wednesday 17 July 2024 revealed the presence of species of cyanobacteria potentially producing toxins and therefore potentially harmful to health.

Symptoms of illness linked to contact, ingestion or inhalation of these substances vary in nature and intensity but can for example include headaches, skin irritations and/or burns or nausea. Anyone who experiences health problems after swimming is advised to contact their GP, mentioning possible contact with toxic cyanobacteria.

For water bodies in which a significant proliferation of cyanobacteria has been noted, the Water Management Authority (based on the assessment of the Health Directorate), has recommended that the public:

- do not let dogs or other domestic animals drink the water;
- avoid any contact with the water;
- avoid any water activities (e.g. water sports, fishing).

Especially when fishing, people should:

- avoid contact with fish;
- not consume caught fish;
- abandon fishing activity if cyanobacteria blooms are visible.

Any observation of blue algae in Luxembourg can be reported via the "Bloomin'Algae" app and will be assessed by a LIST expert. All reports can be viewed on cyanowatch.lu.

At present, swimming remains authorised on the other beaches of the Upper Sûre Lake and in the ponds of Weiswampach, Echternach and Remerschen.

The current situation regarding the opening or closure of official bathing sites can be followed on the website of the Water Management Administration: www.waasser.lu.

The Water Management Authority noted that there is no risk associated with the consumption of drinking water from the Upper Sûre Lake as the raw water is collected at depth (25m) at the dam in Esch-sur-Sûre where the concentration of cyanobacteria is very low and the treatment system in place effectively eliminates the toxins produced by the cyanobacteria.