When people think of Legionella bacteria and the risks they pose, the conversation often turns to warmer months. After all, Legionnaires’ disease is frequently associated with heat, stagnant water, and ideal conditions for bacterial growth. But while summer may highlight the risks, Legionella is a year-round concern—and overlooking it during colder months could be a costly mistake.
Legionella thrives in water systems where temperatures sit between 20°C and 45°C. These conditions aren’t exclusive to summer. Many parts of a building’s water system—such as storage tanks, calorifiers, little-used outlets, or dead legs—can maintain ideal temperatures for growth all year long, especially in heated buildings.
In fact, reduced water usage during the winter in some facilities (such as schools, leisure centres, or seasonal businesses) can increase stagnation, creating perfect environments for bacterial colonisation.
Here are some key reasons Legionella control is just as vital in winter as it is in summer:
Under UK legislation, building owners and duty holders are required to assess and control the risk of Legionella all year round. Neglecting winter maintenance or monitoring responsibilities doesn’t just increase risk—it can result in serious legal and reputational consequences.
That’s why routine monitoring, consistent flushing regimes, and up-to-date risk assessments are vital, no matter the season.
At HBE, we support year-round Legionella risk management with:
Whether it’s summer or winter, your water system doesn’t take a holiday—and neither should your compliance strategy.
Contact HBE today to learn how we can support your organisation’s water treatment compliance needs.
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