Troubled waters:Clear flowing streams are alluring to walkers and campers but taking a sip could land you in the deep end

摘要

Your legs ache as heavy beads of sweat drip from your brow. It's been hours since you began hiking and your water is warm and far from refreshing. You arrive at a seemingly pristine creek and the urge to fill your canteen is overwhelming. The water iscool and fast-moving - you assume it's safe to drink. A week later, however, you realise your mistake. A quick streamside sip could leave you doubled over with abdominal pain, vomiting, fever — and worse.Although scooping water straight from a river can be tempting, it is important to consider the entire catchment. Bacteria, viruses and chemicals can contaminate even remote water sources in wilderness areas.