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Managing Legionella bacteria survival in Hot and Cold-water systems.

Updated: Jun 12, 2023


Legionella bacteria survival in Hot and cold systems

Managing Legionella bacteria survival Hot and cold-water systems.

Legionella bacteria is a type of pathogenic gram-negative bacteria that can cause an infectious pneumonia called Legionnaires' disease. This disease can be fatal and is a significant public health concern. Legionella bacteria can survive and multiply in man-made water systems, and the temperature of water in the system can affect their growth and survival rates.

In this blog, we will discuss the survival rates of Legionella bacteria at different water temperatures in water systems.

What temperature does Legionella Live in water systems?

1. (Below 20°C) – Legionella bacteria can survive at this temperature, although it is unlikely that it will multiply

2. (20°C to 45°C) – At this temperature, Legionella bacteria can survive. This is the ideal temperature range for the bacteria to grow and multiply, leading to higher levels of bacteria in the water system.

3. (37°C) – This temperature is considered to be the optimum temperature for the growth of Legionella bacteria. At this temperature, the bacteria can multiply rapidly.

4. (45°C to 50°C) – Legionella bacteria can survive at this temperature, although it is unlikely that it will multiply

6. (60°C) – Water temperatures at this level can help control the growth of Legionella bacteria and result in a significant reduction in the level of bacteria in the water system.

7. (70°C) – This temperature is considered to be the temperature that can effectively kill Legionella bacteria and is often used to pasteurise infected hot water systems.

What you need to do to prevent Legionella bacteria survival

Duty Holders are required to have access to a legionella risk assessment, which will help to identify the level of risk to users.

It is essential to monitor and control the temperature of water in plumbing systems to prevent the growth and spread of Legionella bacteria. Homeowners and building managers should take steps to ensure the water temperature is kept at a safe level and adhere to any local regulations regarding the control of Legionella bacteria in water systems.


Can you get Legionnaires disease from water systems?

In conclusion, Legionella bacteria can survive and multiply in man-made water systems, and the temperature of the water in the system can affect their growth and survival rates. Maintaining the water temperature at safe levels can help prevent the growth and spread of Legionella bacteria and reduce the risks associated with Legionnaires' disease.






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