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A Guide to Obtaining a Legionella Risk Assessment and the process involved.  

Water is an essential element of our daily lives, but its quality can sometimes pose unforeseen risks. One such risk is Legionella bacteria, which can cause Legionnaires' disease, a potentially severe form of pneumonia. To ensure the safety of occupants in buildings, particularly those with complex water systems, it is crucial to conduct a Legionella risk assessment. In this blog post, we will guide you through the process of obtaining a Legionella risk assessment. 

Understanding Legionella 

Before delving into the assessment process, it's important to understand Legionella and its associated risks.  

Legionella bacteria thrives in water systems, especially those with warm temperatures and stagnant water. Cooling towers, hot water systems, and large plumbing networks are common breeding grounds for Legionella. Legionnaires' disease is contracted by inhaling aerosolised water droplets containing the bacteria, making it essential to assess and manage the risk in such environments. 

Who requires a Legionella Risk assessment? 

Legionella risk assessments are typically required in specific settings, including but not limited to: 

  1. Healthcare facilities 

  1. Hotels and resorts 

  1. Commercial and industrial buildings 

  1. Schools and universities 

  1. Residential complexes 

If you are querying whether you require a Legionella Risk Assessment, if your premises has a water system including washing facilities, toilets, and drinking water then your business runs the risk of Legionella Bacteria building up to dangerous levels.  

If you are responsible for the management or maintenance of a building within one of these categories, it is essential to identify the need for a Legionella risk assessment. This assessment helps identify potential sources of Legionella contamination, assess the risk level, and implement control measures to prevent infections. 

Selecting a Competent Assessor 

Once the need for a Legionella risk assessment is identified, the next step is to choose a competent assessor. The assessor should be qualified and experienced in Legionella risk management. Look for assessors who are not just qualified, but also experienced and knowledgeable. This could include city and guilds qualifications, several years industry experience and individual membership to the water management society. 

Contacting a Legionella Risk Assessment Provider 

Reach out to Legionella risk assessment providers in your area or industry. This may include water hygiene consultants, environmental health professionals, or engineering firms specialising in water safety. Discuss your specific needs, the size and complexity of your water systems, and any relevant industry regulations that must be adhered to during the assessment process. 

Absolute Water Compliance have over 20 years’ experience in Water compliance with city and Guilford engineers we can provide a comprehensive service to water compliance… get in contact today to discuss your requirements.  

Conducting the Legionella Risk Assessment


The assessment itself involves a comprehensive examination of the water systems within the building. The assessor will typically: 

  1. Identify potential sources of Legionella contamination. 

  1. Assess the temperature and condition of water storage and distribution systems. 

  1. Evaluate the effectiveness of control measures in place. 

  1. Review maintenance and cleaning procedures. 

  1. Provide recommendations for improvement and risk management. 

Receiving the Assessment Report 

After the assessment is complete, the assessor will compile a detailed report outlining the findings and recommendations. This report is a crucial document that will guide you in implementing measures to control and prevent Legionella contamination, at this point remedial work may be required.  

Implementing Control Measures 

Acting on the recommendations outlined in the assessment report is vital for effective Legionella risk management. This may include adjusting water temperatures, implementing regular cleaning and maintenance schedules, and installing water treatment systems. Ensure that your team is trained on Legionella awareness and prevention. 

Regular Review and Monitoring 

Legionella risk assessments are not a one-time task; they require ongoing monitoring and review. Regularly revisit and update your risk assessment in response to changes in the water system, building usage, or relevant regulations. 

Obtaining a Legionella risk assessment is a crucial step in safeguarding the health of occupants in buildings with complex water systems. By understanding the process and selecting a qualified assessor, you can proactively manage the risk of Legionella contamination and contribute to a safer environment for everyone.

Remember that prevention is key, and a well-executed Legionella risk assessment is an integral part of that strategy. 

Contact Absolute Water Compliance for your business requirements.

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