Attention: Blue-green algae in Neuruppiner Jahnbad – Baden at risk!
Health warning in Ostprignitz-Ruppin: Blaulgen in Jahnbad and Borker See. Avoid swimming due to low visibility!

Attention: Blue-green algae in Neuruppiner Jahnbad – Baden at risk!
On a bright summer day like today, August 16, 2025, relaxing swimming in the surrounding lakes is very tempting. But the Neuruppin health department has issued urgent advice to bathers: swimming in the Jahnbad and Borker See is not recommended. The visibility depth in these waters is only less than 50 centimeters, which significantly increases the risk of swimming accidents. If the water is so cloudy that you can no longer see your feet in knee-deep water, you should be extremely careful.
Particular attention is paid to suspected blue-green algae in Neuruppin's Jahnbad and at Borker See. These algae can trigger allergic skin reactions and inflammation. You think so maz-online.de, the mass accumulations of blue-green algae are responsible for the low visibility at Borker Lake. This was determined by a control in which the viewing depth was a maximum of 45 centimeters and inflorescences of the plants were visible in a cloud-like distribution in the water.
Regular checks and current situation
The health department carries out regular inspections of the bathing waters in Ostprignitz-Ruppin to ensure the safety of bathers. Fortunately, no blue-green algae were found during the last inspection at Lake Dranser. However, the bathing area at the Großer Prebelowsee near Zechlinerhütte remains closed due to safety deficiencies.
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