11 doctors weighed in:
How long do I have to boil water to make it safe?
11 doctors weighed in

Dr. Joseph Eastern
Dermatology
9 doctors agree
In brief: Depends
As an outdoorsman of 40+ years, i see a lot of bad advice about making water safe.
The cdc's official advice is this: at low altitudes boil vigorously for 1 minute. At altitudes greater than 6, 562 feet (>2, 000 m), boil for 3 minutes, or use chemical disinfection after it has been boiled for 1 minute. Because boiled water is bland and tasteless, add a pinch of salt to make it more palatable.

In brief: Depends
As an outdoorsman of 40+ years, i see a lot of bad advice about making water safe.
The cdc's official advice is this: at low altitudes boil vigorously for 1 minute. At altitudes greater than 6, 562 feet (>2, 000 m), boil for 3 minutes, or use chemical disinfection after it has been boiled for 1 minute. Because boiled water is bland and tasteless, add a pinch of salt to make it more palatable.
Dr. Joseph Eastern
Dr. Joseph Eastern
Thank
Dr. Michael Fisher
Dermatology
In brief: Boiling water
The fact is, with a water temperature of 160 to 165 degrees f (74 c) it takes just half an hour for all disease causing organisms to be inactivated.
At 185 degrees this is cut to just a few minutes. By the time water hits its boiling point of 212 f (100 c) – plus or minus depending upon pressure or altitude – the water is safe.

In brief: Boiling water
The fact is, with a water temperature of 160 to 165 degrees f (74 c) it takes just half an hour for all disease causing organisms to be inactivated.
At 185 degrees this is cut to just a few minutes. By the time water hits its boiling point of 212 f (100 c) – plus or minus depending upon pressure or altitude – the water is safe.
Dr. Michael Fisher
Dr. Michael Fisher
Thank
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