Is it common to experience diarrhea after drinking backcountry water?

Waterborne Pathogens

Drinking untreated backcountry water can expose you to a range of waterborne pathogens, including bacteria (e.g., E. coli), viruses (e.g., norovirus), and parasites (e.g., Giardia, Cryptosporidium). These organisms can cause gastrointestinal symptoms, including diarrhea, nausea, vomiting, and abdominal cramps. In severe cases, waterborne illnesses can lead to dehydration, electrolyte imbalances, and even life-threatening complications.

Assessing Water Quality

When assessing the quality of backcountry water, consider factors such as water source, flow rate, and surrounding environment. Water sources near animal habitats, agricultural areas, or sewage outlets are more likely to contain pathogens. Look for signs of contamination, such as algae blooms, unusual odors, or murky water. If you’re unsure about the water quality, err on the side of caution and use alternative sources or treat the water before consumption.

Treatment and Prevention

To prevent waterborne illnesses, treat backcountry water using methods such as boiling (rolling boil for 1 minute at 212°F/100°C), disinfection with chlorine or iodine tablets, or filtration with a portable filter (e.g., 0.2-micron filter). If you don’t have a water treatment method, consider using a water filter straw or solar still. When in doubt, choose a safer water source or wait for a better option to become available.