Overview

• Initial cyanobacteria blooms have been confirmed by HLNUG at Schultheis-Weiher, Badesee Klein-Krotzenburg and Grube Prinz von Hessen in Hesse, prompting local swimming advisories.
• Of Hesse’s 61 monitored bathing waters, 58 hold an ‘excellent’ hygiene rating and three are rated ‘good’, with none classified insufficient or poor.
• The Thuringian Sea remains free of blooms but authorities warn that persistently high temperatures could trigger algae outbreaks by August.
• Cyanobacteria thrive in waters above 20°C with elevated nutrient levels and pose risks of gastrointestinal illness and skin irritation for swimmers.
• Regional agencies conduct assessments every two to four weeks under EU directives and draw on past incidents to guide public health advice and water management.