New HSE guidance on the Control of Legionella in Spa-pool systems

The control of Legionella and other infectious agents in spa-pool Systems

New guidance has been released by the Health and Safety Executive (HSE) for the management and control of Legionella bacteria.  The guidance is aimed at duty holders and those who manage or operate spa-pool systems, focusing on explaining how to manage and control legionella and other infectious agents.  Spa-pool systems have been linked to numerous outbreaks of Legionnaires’ disease, including fatalities, in leisure centres, hotels and even spa-pool systems that have been on display in retail stores.

The guidance includes advice on effective ways to safely manage and control spa-pool systems through:

  • Design, commissioning, operation and maintenance
  • Testing and monitoring spa-pool water quality
  • Quality and frequency of inspections

Spa-pools are a breeding ground for Legionella bacteria, as the water is usually heated to between 30-40 degrees Celsius which can support the growth and dispersion of Legionella.  Spa-pool systems use stored and circuited water and produce water droplets (dispersed as aerosol) further adding to the risk of the growth of Legionnella.  The organism that causes Legionnaires’ disease frequently grows in poorly designed and managed spa-pool systems.  Other bacteria can also be commonly found in spa-pools including Pseudomonas aeruginosa and environmental mycobacteria that can cause infection.  Information is provided within the HSE guidance on the legislative requirements that applies to the management of spa-pool systems.

For further information and to read/view the HSE guidance please visit





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