Legionella Risk Assessment

A Legionella risk assessment is a legal requirement in the UK that ensures water system safety and mitigates the risk of Legionnaires' disease. This assessment involves a structured evaluation of your property's water systems to identify potential hazards, assess risks, and implement necessary control measures.

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🦠 What is Legionella?

• Legionella bacteria can thrive in water systems, especially in stagnant water between 20–45 °C.

• Inhaling contaminated droplets from sources like taps, showers, or cooling towers can lead to Legionnaires' disease, a serious form of pneumonia.

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📋 What is a Legionella Risk Assessment?

A Legionella risk assessment is a systematic review designed to:

• Identify areas where Legionella could proliferate and pose a risk to water system safety.

• Evaluate the design and usage of your water systems, including pipework, tanks, outlets, and boilers.

• Recommend control measures to minimize or eliminate risks associated with Legionella.

This assessment is crucial for compliance with UK law under the Health and Safety at Work Act, COSHH, and the Approved Code of Practice (ACoP L8). Dutyholders—such as landlords, employers, and building owners—must complete a “suitable and sufficient” Legionella risk assessment to ensure water system safety.

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🛠️ What Does the Assessment Involve?

A typical Legionella risk assessment includes:

• Surveying the water system – mapping tanks, pipework, outlets, and boilers.

• Conducting temperature checks – profiling hot and cold water to ensure they remain within safe ranges.

• Reviewing the system's condition – checking for stagnation, scale, corrosion, or dead legs.

• Evaluating management practices – ensuring that responsibilities and maintenance records are transparently documented.

• Developing an action plan – detailing control measures, ongoing monitoring, and any necessary remedial works to ensure water system safety.

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⚖️ Legal Duties

• Dutyholders must appoint a competent person with the appropriate training and experience to conduct or supervise the Legionella risk assessment.

• The Legionella risk assessment should be reviewed regularly, typically every two years or sooner if there are changes in the systems.

• Findings and actions must be documented as part of a written scheme of control for water system safety.

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✅ Why It Matters

• Protects tenants, staff, and visitors from the severe health risks associated with Legionnaires' disease.

• Demonstrates your commitment to compliance with HSE guidance (HSG 274) and ACoP L8.

• Offers peace of mind that your water systems are managed effectively and safely.