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The Ultimate Guide to Legionella Risk Assessment: Free Templates & Best Practices

Introduction to Legionella

Legionella is a type of bacteria that can cause Legionnaires' disease, a severe form of pneumonia. The bacteria thrive in water systems, particularly in environments where water is stagnant, temperatures are between 20-45°C (68-113°F), and nutrients are available.

Importance of Legionella Risk Assessment

Conducting a Legionella risk assessment is essential for businesses to remain compliant. In Line with industry standard, we undertake legionella risk assessments to BS8580-1:2019. You have peace of mind knowing that your risk assessment is designed to help with compliance.

  • Prevent Legionnaires' disease.

  • Ensure compliance with health and safety regulations.

  • Protect the health of building occupants and visitors.

  • Maintain the integrity of water systems.

Key Elements of a Legionella Risk Assessment

  1. Systematic Survey of Water Systems:

  • Identify all water systems including cooling towers, hot and cold-water systems, decorative fountains, and any other water storage or distribution systems.

  1. Identify Potential Risk Areas:

  • Determine areas where Legionella bacteria could grow and proliferate, such as tanks, pipes, showers, taps, and air conditioning units.

  1. Temperature Monitoring:

  • Check water temperatures to ensure they are outside the range that supports Legionella growth (20-45°C).

  1. Water Flow and Usage Patterns:

  • Assess water flow rates and usage to identify areas of stagnation.

  1. Maintenance and Cleaning Protocols:

  • Review current maintenance and cleaning schedules to ensure they are adequate for preventing Legionella growth.

  1. Water Treatment Measures:

  • Evaluate the effectiveness of current water treatment methods, such as chlorination or the use of biocides.

  1. Documentation and Record Keeping:

  • Keep detailed records of all assessments, findings, and remedial actions taken.

  1. Training and Awareness:

  • Ensure that staff responsible for managing water systems are properly trained in Legionella prevention and control.



How often should you carry out a Legionella Risk assessment?

The Approved Code of practice L8 advises that arrangements should be made to review the LRA "when there is suspect it is no longer valid. Ensuring that the assessment is always up to date when needed

When building occupants are categorised as high-risk and those with a weaker immune system such as the elderly, a Legionella risk assessment may need to be carried out even more regularly.

Free Templates for Legionella Risk checklists

Absolute Water Compliance offer a detailed Free Legionella Checklist that can be used by a Legionella responsible person to assess the premises of the property.

Basic Legionella Risk Assessment Checklist









System Survey

Have all water systems been identified?

Temperature Checks

Are temperatures outside the range of 20-45°C?

Water Flow

Are there areas of stagnation?

Maintenance Schedule

Is there a regular maintenance schedule?

Water Treatment

Are water treatment measures in place?


Are records maintained?


Are staff trained?

What are the best practises for Legionella Risk Assessments.

Best Practices for Legionella Risk Management

  1. Regular Monitoring and Testing:

  • Conduct routine water testing for Legionella bacteria, especially in high-risk systems.

  1. Temperature Control:

  • Store water above 60°C and distribute at 50 degrees (55 in Healthcare) and keep cold water below 20°C where feasible.

  1. System Design:

  • Design water systems to minimize areas of stagnation and ensure adequate water flow.

  1. Regular Maintenance:

  • Implement a strict maintenance and cleaning schedule for all water systems.

  1. Water Treatment:

  • Use effective water treatment methods, such as biocides, to control bacterial growth.

  1. Education and Training:

  • Provide ongoing training for staff on Legionella prevention and control measures.

  1. Documentation and Review:

  • Keep thorough records of all activities related to Legionella risk management and regularly review and update risk assessments.

Legionella risk assessment is a critical component of maintaining safe water systems by following a guide to Legionella risk assessment you can ensure that you are taking the first steps to being compliant. By following the outlined steps, utilizing free templates, and adhering to best practices, you can effectively manage and mitigate the risks associated with Legionella bacteria. Regular assessments, proper maintenance, and informed staff are key to ensuring a safe environment for all building occupants.



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