WATER TREATMENT, DRAINAGE & PIPED SERVICES Legionella control for housing


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Landlords have a legal responsibility to ensure the health and safety of their tenants by keeping the property safe and free from health hazards and that includes legionella control says Roy Sullivan, senior consultant at the Water Hygiene Centre


he Health & Safety Executive (HSE) provides advice on their website concerning legionella and landlords’ responsibilities. In a nutshell, all water systems require a legionella risk assessment in the first instance. The situation was clarified following the publication in 2013 of the fourth edition of the Health & Safety Executive’s Approved Code of Practice (ACOP L8) “Legionnaires’ Disease, The Control of Legionella Bacteria in Water Systems”. However, while the ACOP L8 was updated, it didn’t change or alter the responsibilities placed on landlords who have always had a duty to carry out risk assessments and manage the risk from Legionella bacteria to their tenants. The law is clear that if you are a landlord and rent out your property (or even a room within your own home), then you have legal responsibilities to ensure the health and safety of your tenant by keeping the property safe and free from health hazards.


Legionella Risk Assessment


The water systems in many single residential properties are simple and unlikely to represent a significant Legionella risk when used regularly. Likewise, control measures are also likely to be simple without the need for ongoing interventions. The information on the Health & Safety Executive’s website states: “The practical and proportionate application of health and safety law to landlords of domestic rental properties is that whilst there is a duty to assess the risk from exposure to Legionella to ensure the safety of their tenants, this does not require an in-depth, detailed assessment.” All systems should be assessed but the


programme of assessment should be reasonably practicable. This may mean, in the first instance, undertaking a desktop appraisal of risk to identify properties that could represent an increased risk, for example:


• Properties in which the typical occupants may be of increased susceptibility to infections (e.g. sheltered housing schemes or hostels);


• Larger and more complex properties and water systems (e.g. multi-dwelling units, HMOs etc.)


• Features of the water system design that increase the likelihood of bacterial colonisation (e.g. the presence of hot or cold water storage tanks, hot water generators or showers);


• The age of construction and/or subsequent refurbishments; this may indicate properties in which plumbing is unlikely to comply with current standards.


Of course, there may be other reasons why one property represents a higher risk than another and there is no substitute for an inspection of site water services when it comes to determining the actual risk. A Legionella risk assessment of a sample of sites can provide a representative cross-section of the properties to identify the priorities for the future programme of assessments and control measures. Risk assessments should identify sub-standard installations and suggest how they might be removed, replaced or improved to minimise the risk. The risk assessment should also identify any control measures required to prevent further risk or, where prevention is not reasonably practicable, control any residual risk that may exist. Landlords are not necessarily required to record


the findings of the assessment (this is only a statutory duty for employers where there are five or more employees) but you may find it wise to keep water hygiene records of what has been done. The law does not prescribe that the Legionella risk assessment be reviewed annually or biennially. It is important to review the assessment periodically in case anything changes. However, where there are difficulties gaining access to occupied housing units, appropriate checks can be made by carrying out inspections of the water system, for example, during mandatory visits such as gas safety checks or routine maintenance visits. Recent news detailed how a large housing association was fined £900,000 for allowing vulnerable residents to use contaminated water at its sheltered accommodation in Birkenhead. Below is an extract from the HSE findings; HSE inspector Rose Leese-Weller said: “Sanctuary Housing failed to protect vulnerable residents living at Vincent Naughton Court through its mismanagement of the site’s water system. It is very fortunate that none of the residents became ill as they were allowed, without any proper warnings, to continue to use the grossly contaminated water for a large period of time. Not only was there a failure by Sanctuary Housing to manage the risk of contamination in its water systems, but the company had not provided its staff with adequate instruction and training.” Even though none of the residents contracted Legionnaires’ disease, the company was still prosecuted for their failings.


Control measures


The HSE’s ACOP L8 states that: “All systems require a risk assessment, however not all systems will require elaborate control


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measures. A simple risk assessment may show that the risks are low and being properly managed to comply with the law. In such cases, you may not need to take further action, but it is important to review your assessment regularly in case of any changes in your system, and specifically if there is reason to suspect it is no longer valid”; and “Other simple control measures to help control the risk of exposure to Legionella include:


• Flushing out the system prior to letting the property;


• Avoiding debris getting into the system (e.g. ensure the cold water tanks, where fitted, have a tight fitting lid);


• Setting control parameters (e.g. setting the temperature of the hot water cylinder (calorifier) to ensure water is stored at 60°C);


• Make sure any redundant pipework (dead legs / blind ends) identified is removed;


• The risk is further lowered where instantaneous water heaters (for example combi boilers and electric showers) are installed because there is no water storage.”


Persons undertaking the control measures and any other work on the plumbing systems should have received sufficient legionella training and be competent to undertake the work.


Advice for tenants


The HSE also advise that “landlords should inform their tenants about the action taken to control the risk from Legionella bacteria and advise them how they should be maintained:


• Do not adjust the hot water temperature; • Keep the showerheads and taps clean; • Report faults with the system so that appropriate action can be taken;


• Flush the showers and taps after any period of disuse longer than one week in duration.”


In summary


All rental properties require a Legionella risk assessment. For landlords with only a few properties undertaking risk assessments, or commissioning them, should not be an onerous proposition. However, landlords or agents with responsibility for a large number of properties require a robust plan for the management of the risk of Legionnaires’ disease. These organisations need to ensure that property managers or their advisors are competent.


BUILDING SERVICES & ENVIRONMENTAL ENGINEER FEBRUARY 2025 27


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