Overview
- Local authorities have issued active bathing warnings or bans at multiple sites including Bleilochstausee (Strandbad Saalburg), the small Brombachsee, the Untreusee and stretches of the Danube near Kelheim.
- Officials say hot, calm weather and nutrient‑rich water encourage explosive cyanobacteria growth that can form green or bluish mats and make water unsafe to touch or swallow.
- Dog illnesses in mid‑July near Kelheim, including at least one death, prompted early advisories and veterinarians warn that dogs can be poisoned rapidly by swallowing or licking contaminated water.
- Laboratory tests for the toxin microcystin have been started for affected spots and results for the Bleilochstausee samples were expected the week after August 26, with bans or warnings to stay until tests and trend data justify lifting them.
- EU bathing waters are sampled monthly during the season while other sites are tested once in summer or on an occasion basis so local monitoring and posted signs are the main ways bathers learn of current risks.