Quick Answer
Water should be boiled for at least 10 minutes at 5,000 feet to kill Giardia and other waterborne pathogens. However, boiling time may vary depending on the altitude and desired purification level.
Understanding Altitude and Boiling Time
When water is boiled at high altitudes, it is essential to consider the lower atmospheric pressure. At 5,000 feet, the boiling point of water is reduced, which affects the boiling time required to kill pathogens. Generally, for every 1,000 feet above sea level, the boiling time should be increased by 1-2 minutes to compensate for the lower pressure.
Calculating Boiling Time for High Altitude
To calculate the boiling time for your specific altitude, use the following formula: boil time (minutes) = 10 + (altitude in feet / 1,000). For example, at 5,000 feet, the boiling time would be 10 + (5,000 / 1,000) = 15 minutes. However, this is just a rough estimate and may vary depending on your specific situation.
Additional Considerations for Water Purification
When boiling water at high altitude, it is crucial to consider the effectiveness of the purification method. If you are using a portable water filter or purification tablets, follow the manufacturer’s instructions for high-altitude use. Additionally, consider using a technique called “rolling boil,” where the water is brought to a rolling boil for 1-2 minutes and then removed from heat. This can help to reduce the risk of re-contamination and ensure that the water is safe to drink.
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