If you are a landlord, homeowner, or business owner, understanding your responsibilities around Legionella risk is essential. We provide professional Legionella Risk Assessments across the UK, helping you stay compliant, protect occupants, and meet UK health and safety regulations.
What is Legionnaires’ Disease?
Do You Need a Legionella Risk Assessment?
Legionnaires’ disease is a potentially serious form of pneumonia caused by inhaling small droplets of water contaminated with Legionella bacteria. These bacteria can develop in man-made water systems such as hot and cold water systems, tanks, showers, and pipework. (HSE)
The risk increases when water:
- Produces airborne droplets (e.g. showers or taps) (HSE)
- Is stored or recirculated
- Sits between 20°C and 45°C
- Contains nutrients like sludge or rust
Under UK law, landlords, employers, and anyone responsible for a property must assess and control the risk of Legionella. This duty falls under:
- Health and Safety at Work etc. Act (HSWA)
- Management of Health and Safety at Work Regulations
- Control of Substances Hazardous to Health Regulations (COSHH) (HSE)
If you own or manage property in Norwich or Norfolk, you are legally required to:
- Identify potential sources of Legionella
- Assess the level of risk
- Implement control measures
- Maintain records and review regularly (HSE)
For landlords, even simple domestic properties require a risk assessment, although in many cases the risk is considered low and easy to manage. (HSE)

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