What action should be taken to protect patients against Legionella in a water system?

The most effective action to protect patients against Legionella in a water system is regular testing and maintenance of water systems. This proactive approach ensures that the water supply remains safe and within acceptable limits for Legionella growth. Regular testing allows for the early detection of Legionella bacteria, enabling prompt corrective actions to be taken before any potential outbreaks occur. Maintenance activities, such as cleaning and sanitizing water systems, along with addressing any design flaws or dead legs in the plumbing, help create an environment that is less favorable for the growth of Legionella.

In contrast, while flushing all outlets monthly can help reduce stagnation and thus lower the risk of Legionella development, it is not a comprehensive solution and does not guarantee that all potential sources of Legionella will be addressed. Monitoring water temperature alone is insufficient, as it must be part of a broader strategy that includes other preventive measures. Exclusively using bottled water may circumvent some risks but does not address the safety of the entire facility’s plumbing system and could be impractical for continuous use, especially in larger healthcare settings. Therefore, regular testing and maintenance represent a more robust and balanced approach to ensuring the safety of the water system from Legionella threats.