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Is it safe to drink untreated water if I have diarrhea?

April 5, 2026

Quick Answer

Drinking untreated water can exacerbate diarrhea and increase the risk of dehydration and other waterborne illnesses, making it a poor choice for individuals experiencing diarrhea.

Understanding the Risks of Untreated Water

Drinking untreated water can be a recipe for disaster when you’re already dealing with diarrhea. Diarrhea is a symptom of an underlying issue, and consuming untreated water can only worsen the situation. In the backcountry, where access to clean water may be limited, it’s essential to prioritize water safety.

Boiling Water: A Reliable Method

Boiling water is the most effective way to kill bacteria, viruses, and other pathogens that can cause waterborne illnesses. Bring the water to a rolling boil for at least 1 minute at an elevation of up to 6,500 feet. At higher elevations, increase the boiling time by 1 minute for every 1,000 feet of altitude gain.

Alternative Water Purification Methods

If boiling water is not possible, consider using alternative purification methods, such as water filters or disinfection tablets. Water filters can remove particulate matter and some bacteria, while disinfection tablets can kill bacteria and viruses. When using these methods, follow the manufacturer’s instructions to ensure proper use. Always err on the side of caution and assume untreated water is contaminated, even if it appears clear.

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