Legionella is found in water of all kinds, especially warm water. It spreads in droplets from shower heads, fountains, hotel pools, hot tubs and HVAC cooling towers. Studies have shown Legionella rates go up after rain, especially in warm, humid weather.

Legionella does not spread person to person and cannot be contracted by drinking water containing Legionella bacteria.

Decontamination of identified environmental sources is of primary importance for prevention.

Legionella is abundant in the environment: the most common presentation is acute pneumonia (legionellosis), and potentially any species of Legionella may cause the disease. Less often, disease presents as a non-pneumonic, influenza-like illness called Pontiac fever. Smokers, individuals with weakened immune systems and those with underlying health conditions are most vulnerable to infection.

In some cases, Productions may have responsibilities for managing and controlling Legionella: you can see the key potential safety concerns and checklists are below.

Legionella Production Guidance (UK)