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Can I drink unheated cold water?

Can I drink unheated cold water? Can I drink unboiled warm water?
   The greatest risk to public health in water is microorganisms. Microorganisms mainly come from the pollution of drinking water by human and animal feces. Feces may be a source of pathogenic bacteria, viruses, protozoa and worms. Therefore, the most important thing to worry about when drinking water is the microbiological risk.
  As long as the bottled water is normally ordered, as long as the product is qualified, it has been disinfected and sterilized. Under the premise of ensuring that the drinking fountain is hygienic, generally speaking, there will be no safety problems for direct drinking. If the drinking fountain uses tap water or tap water filtered through a household filter, since it is usually sterilized by a water plant, there may not necessarily be a safety problem. However, there may be pollution during the transportation of tap water, so it is best to heat it before drinking.
   Then, can the water be slightly heated to warm water? In fact, if the heating temperature and heating time are not enough, there may still be microorganisms that survive by chance, and direct drinking may also pose a safety risk.
   In fact, some foreign countries, such as the United States, require drinking water safety education in their communities, reminding people to drink boiled water, so as to better ensure safety. So strictly speaking, cold water that is not heated and warm water that is not fully heated are safety risks.
   It should be pointed out that the drinking fountain is not always hygienic. In the process of use, the drinking fountain may also breed bacteria. If it is not cleaned for a long time, there may also be a safety risk. There have been many cases of poisoning caused by drinking water in our country.
   Generally speaking, the pollution in drinking fountains mainly comes from two aspects: First, during use, microorganisms such as bacteria and viruses may enter the drinking fountain with the air. Moreover, dust in the air itself may also enter the drinking fountain and become a "hotbed" for the growth and reproduction of microorganisms such as bacteria. Second, there are some structural dead ends in the contact between the base of the drinking fountain and the barrel. If it is not cleaned for a long time, it will become a zone where bacteria and other microorganisms grow.
   Then, how often should the water dispenser at home be cleaned? It is difficult to give a clear deadline. Because each household uses water dispensers differently, and the sanitary conditions at home are also different. Some people’s homes are very clean, and they usually pay attention to hygiene. The drinking fountains may be kept hygienic for a long time; but some people may not pay attention to hygiene, so they must clean them.
   Shanghai has made an investigation on the sanitary conditions of public drinking fountains on campus. The results found that after one to two months of disinfection of the campus drinking fountains, the microbiological indicators exceeded the standards, and the main ones that exceeded the standards were the total number of colonies and coliforms. Although these are not pathogenic bacteria and do not necessarily have safety risks, they also remind us that drinking fountains are still easy to breed bacteria. Therefore, it is necessary to clean the drinking fountain every one to two months.
   As for the specific cleaning methods, different drinking opportunities are different, and they are usually attached to the instruction manual of the drinking fountain. Therefore, it is recommended that you follow the steps in the instructions to disinfect and clean the water dispenser regularly.