Overnight boiled water can be drunk. Some people think that you can’t drink boiled water after overnight because of two reasons: one, a large number of bacteria exist in it. Second, the overnight boiled water causes cancer. In fact, both are not true. Overnight water contains certain bacteria, but not a lot, and drinking cool white water for the body has a lot of benefits, can not guarantee that there is no bacteria in the water, just how much of the problem. If the water is put more than two days do not drink, but overnight that is 8-12 hours is no problem. There is also boiled water repeatedly decocted before it can cause cancer, but must be decocted more than 35 times, the average family can not do. Therefore, overnight boiled water is not harmful to the body, if needed, you can decoct it again and drink it after boiling.