Quick Answer
Boiling water can kill most harmful organisms, but some may survive if boiled for less than 1 minute at a high enough temperature, or if boiled at a lower temperature for an extended period.
Boiling Temperature and Time
To effectively kill most harmful organisms, water should be brought to a rolling boil for 1-3 minutes. The Centers for Disease Control and Prevention (CDC) recommend boiling water at a rolling boil for 1 minute at altitudes below 6,562 feet (2,000 meters). At higher altitudes, boiling time should be increased by an additional 1 minute for every 1,000 feet (300 meters) of elevation gain.
Alternative Methods of Water Purification
While boiling is an effective method of killing bacteria, viruses, and protozoa, it may not be practical in all situations. In these cases, alternative methods such as filtration or disinfection with chlorine or iodine tablets can be used. These methods can be more efficient and convenient, but they require proper use and maintenance to ensure effectiveness.
Common Myths and Considerations
One common myth is that boiling water kills all organisms, including viruses and protozoa. However, this is not entirely true. Some viruses and protozoa, such as Giardia and Cryptosporidium, can survive boiling temperatures and times. Additionally, boiling water does not address the presence of particulate matter, such as sediment and silt, which can still pose a risk to health if ingested.
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