Overview
- Over the past few days multiple hikers who drank water from Pyrenean streams or lakes developed severe vomiting and diarrhea and were airlifted to hospitals, with reports citing nine people from two groups and two earlier cases.
- Local mountain rescue teams and the Préfecture des Hautes‑Pyrénées warned that even clear mountain water can be contaminated by animal feces, runoff, bacteria such as E. coli and parasites like Giardia or Cryptosporidium.
- Authorities stressed that portable filter bottles do not reliably remove all pathogens or dissolved pollutants and should be treated as an emergency option rather than a primary water source.
- Officials advised carrying enough bottled or tap water, planning routes to use official refill points, and treating uncertain water by boiling or with chemical tablets, while guidance on hourly intake varied between about 0.5 and 1 liter per person depending on conditions.
- Rescuers say these incidents place daily strain on emergency services and underline a recurring risk in the Pyrenees after roughly 50 similar rescue calls in 2025, so hikers and local operators should expect continued warnings and plan water supplies accordingly.