Review Your Legionella Assessment Every 2 Years

Review Your Legionella Assessment Every 2 Years

Legionella Review

Review Your Legionella Assessment Every 2 Years


The HSE guidance states that domestic hot water system should be set at up to 60°C and water should reach 50°C at discharge within one minute.
If it is set above 45°C this reduces the risk but remember the water may cool while in the system, especially if it is not properly lagged. You will
need to consider the risk of scalding for those who are vulnerable, thermostatic valves can reduce the risk.
Even if there is no storage of hot or cold water in the system and the hot water system temperature is set above 45°C a risk assessment is still
necessary, but straightforward. Suitable controls have to be introduced as a result of the assessment. There can be other factors which increase
the risk of Legionnaires Disease e.g. dead legs, uncleaned shower heads or long runs of pipework which contain warm water. You can reduce
the risk by proper design, maintenance and operation of the system.

What is the landlord's responsibility?

There is a duty to assess the risk of exposure and if need be implement appropriate control measures.
You must consider the risks from Legionella that may affect anyone you employ and any members of the public, tenants and guests, and take
suitable precautions. The responsible person should record the risks and precautions and review the assessment from time to time.

What does the landlord need to do?

As the person controlling premises you need to decide what water installations or systems on the premises may give rise to a risk of Legionella.
You can carry out a risk assessment yourself if you are competent, or you can employ an external contractor who is.
A simple Legionella risk assessment may show that there are no real risks from legionella and no further action may be required. However, it is

important to review the risk assessment regularly in case anything changes.

What happens if the landlord does not carry out his/her obligations?

The consequences can be serious. As a landlord you are legally required to manage properties so as not to expose tenants, residents and

visitors to risk. Heavy fines or even imprisonment can be imposed especially if someone were to unfortunately die. You can be prosecuted even

if there is an exposure to risk without anyone actually becoming ill.

How often should I carry out a Legionella Risk Assessment?  


According to HSE ACoP L8 The Control of Legionella Bacteria in Water Systems, the assessment should be reviewed every 2 years and if there

is reason to suspect that it is no longer valid, for example:

  • Where there have been changes to plant, the water system or its use;
  • Where there have been changes to the use of the building;
  • Where new information about risk or control measures has become available;
  • Where monitoring indicates that control measures are no longer effective.