Legionnaires' Disease is a pneumonia like illness caused by the Legionella bacteria and can be fatal. The infection is caused by breathing in small droplets of water contaminated by the bacteria. The disease cannot be passed from one person to another.
Legionella bacteria are found in the natural environment and may contaminate and grow in water systems, including domestic hot and cold water systems. They survive low temperatures and thrive at temperatures between 20 - 45°C if the conditions are right. They are killed by high temperatures at 60°C or above.
Landlords are under a duty to ensure that the risk of exposure to tenants, residents and visitors by Legionella is properly assessed and controlled.
Normally there is no reason why the landlord should not carry out this risk assessment himself/herself so long as they are competent. Usually there will be no need to employ a consultant. The assessment should be a straight forward simple exercise in ordinary domestic premises.
For most residential settings the risk assessment may well show the risks are low so long as simple control measures referred to in the next section are followed. This will apply to houses or flats with small domestic type water systems where the water turnover is high. Provided the risk assessment shows that the risks are insignificant and the control measures are being properly managed no further action would be necessary. It is important, however, to keep the assessment under review periodically in case anything changes to the system.
Simple control measures will help manage the risk from Legionella and these should be maintained including:
Landlords are entitled to expect the tenants will play their part in ensuring control measures are maintained. Landlords should:
The risk from Legionella may increase if the property is unoccupied even for a short period. It is important that water is not left to stand in the hot or cold water systems. As a general rule, all outlets on hot and cold water systems should be used at least once a week for at least 2 minutes to maintain a degree of water flow and minimise the chances of stagnation. For long periods consider draining the system. Make sure that the system is flushed through when it is re-occupied by running all outlets for at least 2 minutes.
HSE have published detailed guidance and the relevant extract relating to residential accommodation is available here.
As already indicated, landlords are responsible for making sure that the risks involving Legionella are properly assessed and controlled. Where a managing agent is used the management contract should specify who has responsibility. Landlords must assume that unless the managing agent takes on this responsibility, they as landlord will be responsible for compliance.
For straight forward residential accommodation the answer to this should be "no" as long as landlords are reasonably knowledgeable and competent. Sometimes agents and consultants tell landlords that they need to employ a consultant to conduct an annual check or even to have sampling undertaken. HSE guidance indicates that normally this will not be necessary. However, if a block of flats are involved, unless each flat has its own self-contained hot and cold water system, a more comprehensive risk assessment may be needed.
The consequences can be serious. Landlords 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. Landlords can be prosecuted even if there is an exposure to risk without anyone actually becoming ill.