Which type of water systems should be included in a Legionella water management plan survey?

In the context of a Legionella water management plan survey, including domestic (potable) hot water systems is crucial because these systems are known environments where Legionella bacteria can proliferate. Hot water systems typically operate within temperature ranges that are conducive to the growth of Legionella, especially if the temperatures are not adequately maintained. Legionella thrives in warm water conditions, particularly between 77°F and 113°F (25°C to 45°C), and if these systems are not regularly monitored and maintained, they become potential sources for outbreaks.

Moreover, domestic hot water systems are directly related to human consumption and use, making the management and mitigation of Legionella risks in these systems particularly critical. Regular assessments of temperature controls, system design, and maintenance practices in these potable systems can significantly minimize the risk of Legionella exposure, thereby protecting public health.

In contrast, non-potable systems, while important to consider in a comprehensive water management plan, are less directly related to human consumption and typically present lower risk levels in terms of Legionella transmission. Drinking water sources alone may not reflect the potential issues within the distribution systems where warming and stagnation can occur. Drainage systems are also not typically associated with Legionella risks since they are not systems where water is heated