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RA-HS62 Legionella Risk Assessment
RA-HS62 Legionella Risk Assessment
File Reference : RA-HS62 Legionella Risk Assessment
Date File Updated 17-01-25
File Format MS Word
No. of files 1
Category Risk Assessments
Tags: ISO 45001

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This example risk assessment has been prepared using the
F-HS20 General Risk Assessment form template.

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Legionella Risk Assessment

This fully completed Legionella risk assessment example has been prepared by a qualified health and safety professional. It covers assessment and management of the risk of Legionella bacteria growth and dissemination in water systems, including hot and cold water systems, cooling towers, spa pools and any other water systems that could create an aerosol, and can be used as a starting point when developing your own risk assessment documentation.

What Does This Legionella Risk Assessment Cover?

This risk assessment identifies the key hazards associated with Legionella in water systems including;
  • Legionella infection from contaminated water systems — inhalation of aerosols from hot or cold water systems, cooling towers or spa pools causing Legionnaires disease, a potentially fatal form of pneumonia
  • Cooling tower and evaporative condenser Legionella risk — warm recirculating water providing ideal growth conditions with potential for widespread aerosol dispersal
  • Failure of Legionella control during refurbishment or shutdown — stagnant water systems during building works or low occupancy creating conditions for rapid Legionella multiplication

Each hazard includes an inherent risk rating ranging from Substantial, and a comprehensive listing of applicable control measures covering areas such as;

  • Written scheme of control produced and implemented by a competent person
  • Hot water stored at 60°C and distributed at 50°C; cold water stored and distributed below 20°C
  • Dead legs, infrequently used outlets and stagnant zones eliminated or flushed weekly
  • Cooling tower biocide dosing, water quality testing and 6-monthly cleaning and disinfection
  • RPE worn by maintenance staff during cooling tower cleaning operations
  • System flushing and disinfection protocol before bringing stagnant systems back into use after shutdown

A residual risk rating is then assigned to each hazard, demonstrating how effective risk management reduces overall risk to a tolerable level.

A Professional, Easy-to-Use Risk Assessment Template

This document uses colour-coded header styles matched to risk ratings, making it quick to read and easy to communicate during toolbox talks and worker training. A built-in risk rating matrix supports consistent evaluation of likelihood and consequence, and hazard pictograms using internationally recognised ISO warning symbols are included alongside relevant hazard entries.
The result is a completed risk assessment that looks professional, reads clearly, and demonstrates a structured and effective approach to risk management.

Who Is This Risk Assessment Template Suitable For?

This Legionella risk assessment template is suitable for health and safety advisers, facilities managers, building managers, responsible persons and any employer with a duty to assess and manage Legionella risk under the Control of Substances Hazardous to Health Regulations 2002 (COSHH), HSE Approved Code of Practice L8 and HSG274. It can be implemented as a standalone document or as part of a broader occupational health and safety management system aligned with ISO 45001.

Note: This example risk assessment is supplied for use as guidance only and should be reviewed and completed by a competent person.

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