What is a common misconception about Legionella bacteria?

Legionella bacteria are often mistakenly thought to thrive in low temperatures, but this is not true. In fact, these bacteria prefer warmer water temperatures, specifically between 77°F and 113°F (25°C to 45°C), with optimal growth occurring around 95°F (35°C). This misconception can lead to insufficient preventive measures since many assume that by keeping water systems at lower temperatures, they can prevent Legionella growth. Understanding that Legionella flourishes in warm water is crucial for effective management and control in plumbing systems, especially in settings like hot water tanks, cooling towers, and complex plumbing systems where stagnant warm water may exist. Recognizing this helps prioritize water temperature monitoring and control strategies in risk management practices.