how long should water be boiled to purify
To do so, you will need a heat source, such as a cooker or camping stove, and a vessel to hold the water. According to the Washington State Department of Health and the United States Environmental Protection Agency, you should bring the water to boil and keep it rolling for one minute to purify it. At altitudes above one mile, 2,000 meters, you should increase the rolling time to three minutes.