October 19

How Hot Does Water Need to Be to Kill Germs


Most people believe that boiling water is the only way to kill germs, but this is not the case. While boiling water will kill most bacteria, it does not necessarily kill all viruses. The temperature of the water needs to be above 160 degrees Fahrenheit to ensure that all germs are killed.

When it comes to germicidal action, there is a general rule of thumb that the hotter the water, the better. However, this is not always true. Water that is too hot can actually be less effective at killing germs than water that is just hot enough.

The ideal temperature for water to kill most bacteria and viruses is between 140-160 degrees Fahrenheit. At these temperatures, water will quickly disrupt the cell walls of microorganisms, causing them to die. However, water that is boiling hot (212 degrees Fahrenheit) will not necessarily kill all bacteria and viruses.

In fact, some resistant strains of bacteria can survive in boiling water. This is why it’s important to use a reliable disinfectant in addition to hot water when cleaning surfaces or laundering items contaminated with potentially harmful microbes. In general, though, hot water is an effective way to reduce the number of harmful microbes on surfaces and in fabrics.

When used correctly, it can help keep your home clean and healthy.

What Temperature Kills Bacteria Degrees

Bacteria are killed at different temperatures and rates depending on the type of bacteria. For example, E. coli is killed more slowly at a lower temperature than S. aureus. But both types of bacteria are killed more quickly at 70°C than they are at 20°C.

The table below shows the approximate time it takes to kill various common foodborne pathogens at different temperatures: Pathogen Temperature (°C) Time to Kill (minutes) Escherichia coli O157:H7 70 1-2

Salmonella enterica 70 1-2

What Temp Water Kills All Bacteria?

It is a widely held belief that boiling water kills all bacteria. However, this is not entirely true. Boiling water does kill most bacteria, but there are some that can survive at high temperatures.

These include thermophilic bacteria, which are found in hot springs and other environments with high temperatures. The temperature at which water kills all bacteria is called the sterilization point. This point varies depending on the type of bacterium, but is generally between 60 and 70 degrees Celsius (140-160 degrees Fahrenheit).

At this temperature, all bacterial cell walls break down and the cells die. However, it should be noted that there are some viruses that can also survive at high temperatures. So while boiling water will kill most bacteria, it may not kill all of them.

For this reason, it is always important to practice good hygiene and wash your hands thoroughly after coming into contact with any potential sources of contamination.

Will 120 Degree Water Kill Bacteria?

It’s a common misconception that hot water is more effective than cold water at killing bacteria. In reality, it’s the opposite. Extremely hot water can actually damage your skin and lead to more bacterial growth.

Water that is around 120 degrees Fahrenheit is hot enough to kill most bacteria. However, there are certain types of bacteria, such as those that cause Legionnaires’ disease, that can survive in extremely hot environments. Additionally, while hot water may kill bacteria on surfaces, it doesn’t necessarily remove them from fabrics or clothing.

How Hot Should Water Be to Disinfect?

It is recommended that you use water that is at least 190 degrees Fahrenheit to disinfect. This temperature will ensure that any bacteria or viruses present in the water are killed.

Does 70 Degree Water Kill Bacteria?

Yes, 70 degree water can kill bacteria. However, it must be hot enough and in contact with the bacteria for a long enough period of time to actually work. The reason that hot water is effective at killing bacteria is because it denatures proteins.

This means that the structure of the proteins changes when they are exposed to heat, which makes them unable to function properly. When bacteria are unable to function properly, they will eventually die off.


The water needs to be pretty hot to kill germs. Most of the time, boiling water is the best way to do this. You can also use bleach or other disinfectants.


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