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It's one of the most common questions we get asked: 'How often do I need to redo my Legionella risk assessment?' The short answer is that there's no single fixed interval mandated by law — but the practical answer is more nuanced.

Legionella is a type of bacteria that occurs naturally in freshwater environments — rivers, lakes, and soil. In small quantities, it's harmless. But when Legionella finds its way into building water systems and encounters the right conditions, it can multiply rapidly to dangerous levels.