While the fatality rate of those infected ranges between 5 and 30 per cent, the disease can be fatal in roughly 50 per cent of patients who go untreated.

The cooling towers and central air conditioning systems as well as the hot and cold water systems installed in your properties are just a small selection of the many ideal environments for Legionella bacteria. Your properties are at a higher risk of contamination if they have a large number of cooling towers, air conditioning systems, shower heads and other water outlets that generate a sizeable amount of water droplets.  The following conditions can increase the chance of contamination:

  • Water temperature of 20 to 45 degrees Celsius in all or some parts of the system, which is the optimal temperature range for bacteria growth
  • Stored and/or re-circulated water that has not been replaced or treated
  • Tanks or pipes that contain deposits of rust, sludge, organic matter and other biofilms, which provide nutrients for bacteria

People contract Legionnaires’ disease by inhaling the contaminated airborne water and/or soil particulates that are dispersed through air conditioning vents and/or water outlets.

Contact David Sinnamon at Willis IRM to find out about Legionella Risk Assessments.

Call 02890329042 or use the contact form below to get in touch with our Risk Management expert

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