Legionella Risk Assessment For Duty Holders





    We will process your data in accordance with our Privacy Policy. You can opt out of these communications at any time by updating your perferences.

    By entering your details you agree that Comfort Services Group Ltd may use this information to market its services to you.

    We will never pass your information on to 3rd parties.

    What You Need To Know About Legionella Risk Assessments


    Legionella Compliance (The Law)


    Your Responsibilities


    How Comfort Services Group can help you

    It is important to ensure that your programme of Legionella risk assessment and testing meets legal and regulatory requirements. At Comfort Services Group our highly experienced specialists are experts in legionella control and can carry out comprehensive Legionella Risk Assessments to ensure that your legal obligations are met and help advise you on any steps that need to be taken to make your water system safer.

    Whether your system is due for a routine assessment or changes have been made that require an up to date one be carried out, after thorough testing we will provide you with a detailed report that clearly 

    outlines any areas that require improving as well as any recommendations for making the system safer or more efficient.

    In addition to carrying out regular water system testing and legionella risk assessments, we are also able to advise on reducing high concentrations of Legionella. We will assist in setting up company procedures for water management and sampling to help ensure that all requirements are met. This includes assisting with recording and legal documentation to ensure your obligations, as an organisation, are covered.

    Our team of experienced engineers have been DBS checked and, for your complete peace of mind, will always present official identification.


    Water system at college salon has been linked to the outbreak of Legionnaires’ disease

    The water system at a hairdressing salon in North Lincolnshire College has been identified as the likely source of an outbreak of Legionnaires’ disease which put two women in hospital.


    Fears mount of another Legionnaires’ outbreak as toll hits 80 after eight more people are diagnosed with the deadly disease

    Leading Legionnaire’s expert claimed cash-strapped firms were deliberately falsifying safety logs and said the practice could have devastating consequences. Find the original article HERE.


    Company must pay £1.8m after risking Legionnaires for six years

    The cash management arm of multi national security firm has been fined £1.8m after its failure to manage water systems at its office in Essex for around six years, risked exposing staff to legionella.


    What You Need To Know About Legionella Risk Assessments

    Every UK business, regardless of their size or scope is legally required to conduct regular legionella risk assessments to identify potential issues and to keep employees, customers, and others safe.

    Legionella risk assessments are a crucial part of legionella control that work to pinpoint possible dangers and set out the measures that should be taken in order to rectify them or in cases where levels of bacteria are too high, to reduce them back down to a safe amount.

    All landlords, employers, owners, managers and operators of commercials premises such as – hotels, offices, stadiums, healthcare, education and social housing, have an obligation to understand and manage the Legionella risk within their properties.

    It is their responsibility to ensure that the risk of exposure to tenants, visitors, employees and residents is properly assessed and controlled by undertaking and completing regular Legionella Risk Assessments of all water systems.

    Legionella bacteria is considered to be ‘preventable’ because when reasonable precautions are taken it can be kept under control and there are stiff penalties for businesses that do not take the required steps. In the event that there is an outbreak of legionnaires disease at a property which you manage, own or are in charge of, you will need to be able to provide tangible evidence that you took every reasonable measure within your power to reduce, manage and control the risk of legionella exposure. You will be required to provide the relevant authorities with proof of the appropriate legionella control measures you have taken which will include an up to date risk assessment as well as records of all water system maintenance, monitoring and testing.

    Failure to be able to provide sufficient evidence of your attempts to control the risk of legionella exposure can have severe consequences including legal action, substantial penalties and in some cases, a prison term.

    What is Legionella?

    Legionella comprises of a group of naturally occurring bacteria, low levels of which can typically be found in most naturally bodies of water including ponds, lakes and rivers. The levels of naturally-occurring legionella is typically too low to cause a risk to humans but when the bacteria is found in man-made water systems the risk of human infection increases significantly. The reason behind this increased risk is that the conditions found within man-made systems are often ideal for the incubation and multiplication of legionella bacteria.

    Infection from Legionella bacteria occurs when aerosolised water droplets containing the bacteria are inhaled. Because of this, the highest risk comes from open systems and spray producing outlets such as taps and showers where the bacteria is contained within minute droplets of water discharged from the system.

    The size and complexity of a water system will have a direct correlation with the level of risk, for example a simple, domestic water system will provide less opportunity for the reproduction of legionella compared to a complex commercial one. Because of the amount of people that can typically use, visit, work or live in larger residential and commercial properties, these systems carry a higher risk of infecting a greater number of people which can result in an outbreak/epidemic.

    It is this higher level of risk, as well as the consideration of legal regulation and liabilities, which make regular testing and risk assessments in larger or commercial properties an essential consideration.

    Is your property at risk from Legionella?

    There is a risk of Legionella in almost every building which operates hot and cold water systems, but unlike 

    other Health & Safety issues such as fire safety and asbestos, it can often be overlooked by those in charge. Underestimating the potential risks can have severe consequences for yourself and anyone who uses the building so it is important to understand what you need to do and why legionella risk assessments are a crucial to ensuring that your properties water system is safe.

    Some of the key things that can make buildings more vulnerable or at risk of legionella include;

    Complex water systems – Domestic cold water systems for example present a relatively low risk for legionella, However, properties with bigger or more complex water systems often found in large commercial buildings pose a much greater risk.

    Optimum Conditions –Certain types of water systems are more likely to provide the incubation conditions needed for legionella bacteria to multiply. This includes hot and cold water systems, spa pools, vehicle wash systems, safety showers, sprinklers, fountains, water features, spray humidifiers, cooling water systems, cooling towers, evaporative condensers and any type of system that contains water within which Legionella could breed and become aerosolised.

    System materials –Thequality of materials used in a system can have a significant effect on its legionella risk. Materials which are prone to deterioration can release impurities such as limescale, rust or algae into the water which can act as a nutrient for the legionella bacteria, encouraging multiplication. This is why for older systems it is important to ensure that parts which show any signs of corrosion or deterioration are renewed or replaced as quickly as possible.

    At Comfort Services Group our expert engineers can carry out professional legionella risk assessments to thoroughly evaluate your properties water systems and identify any potential risks, as well as help to put in place effective measures to control, reduce or manage legionella levels.


    Legionella Compliance (The Law)

    It is the person responsible for a commercial premises that is legally required to ensure that regular and suitable legionella risk assessments and testing are carried out. In the instance of a commercial premises, this liability typically falls to the landlord. As the landlord it is your responsibility that, asides from regular risk assessments, complete and accurate records are kept of all testing. Comfort Services Group can help to take the stress out of legionella risk assessments by ensuring that your legal obligations are met and that record keeping complies with all necessary regulations.

    As landlord, the regulations state that it is your responsibility to identify any potential sources of legionella and demonstrate that all risks have been correctly managed, either through control or prevention. Failure to comply with legionella regulations (either by failing to carry out a suitable risk assessment, failure to record data correctly or failure to take appropriate action where a risk is identified) can make you liable for prosecution or a substantial fine.

    According to the Health and Safety Executive: “Under general health and safety law, as an employer or person in control of a premises, you have health and safety duties and need to take suitable precautions to prevent or control the risk of exposure to legionella. Details of the specific law that applies can be found in part 1 of Legionnaires’ disease:

    Carrying out a risk assessment is your responsibility and will help you to establish any potential risks and implement measures to either eliminate or control risks. You may be competent to carry out the assessment yourself but, if not, you should ask someone with the necessary skills to conduct a risk assessment. This can be done by someone from within your own organisation or from someone outside, e.g. an external consultant.”

    Your Responsibilities


    The level of Legionella risk can vary significantly between water systems depending on their design, construction and complexity. However, regardless of the level of risk, it is essential that regular risk assessments are carried out to comply with your legal and regulatory obligations. At Comfort Services Group, we recommend that, as a minimum, legionella risk assessments are completed every two years (and more frequently for higher risk systems such as complex air conditioning systems).

    Often, low risk systems will require little or no preventative or control work but must still be subject to regular assessments. Systems which have a higher risk may require immediate work to reduce levels of legionella and help prevent a potential outbreak of legionnaire’s disease. Systems most at risk of harbouring and incubating legionella bacteria include: 


    The prevention of legionella may be possible without the need for control measures and systems to be put in place. The first consideration is whether it is possible to completely eliminate the risk of Legionella without the need for control measures. This will be largely dependent on the required specification and type of system needed. If the risk of Legionella cannot be completely eliminated then it is necessary for control measures to be implemented which effectively limit the risk of legionella and associated diseases.

    HSE guidelines require that, where a risk of legionella is present in a system, that sufficient controls are implemented to ensure that this risk is managed. At Comfort Services Group, we assist with the whole process, from identifying areas of a system which may present a Legionella risk to advising on preventative measures. We can also carry out further testing and advise on reporting and the keeping of records to comply with necessary legislation.

    As landlord and the person in charge of the premises, it is important to understand your personal responsibilities with regards the risk assessment and control of legionella. Procedures need to be put in place for the assessment and, where required, implementation of a control scheme. This can be managed by yourself, a colleague or a third-party (such as Comfort Services Group) but it is your responsibility to determine who is responsible for this. We recommend assigning a third party with the experience and system knowledge required to alleviate the burden on this responsibility.

    At Comfort Services Group, we can also help you to keep accurate records which are essential to meet necessary HSE regulations. These records include the nature and frequency of testing, observations made and any reparatory work undertaken. Contact Comfort Services Group today to find out how we can help with your legionella risk assessment and control.



    Once risk has been identified, it must be then managed (regardless of the level of risk identified through the risk assessment). Risk management may be delegated to a third party providing they have the appropriate experience, skills and system knowledge.

    Comfort Services Group careries out risk management for a number of clients relieving the client and their staff of this responsibility. Why not contact Comfort Services Group today to find out how we can help identify and manage Legionella risk for your commercial property.


    Example tasks and how often they should be carried out:

    Frequently Asked Questions

    How often do Legionella risk assessments need to be done?

    This will typically depend on the type of property and the size and type of water systems but as standard it is recommended that a legionella risk assessment is carried out or reviewed at least every 2 years. However, if there have been significant changes or modifications made to the system in between this time then it will need to be revised.

    What is the process of a Legionella risk assessment? 

    The process can vary depending on the type of water system, its size and complexity but a typical Legionella Risk Assessment can include:

    Is it a legal requirement to have a Legionella risk assessment? 

    Under UK health and safety law, property managers, landlords and business owners are legally required to take into account, assess and mitigate the risk of legionella within their properties or businesses.

    Although there is no such thing as a ‘legionella certificate’, they must be able to provide evidence that they have carried out a risk assessment of their property and are taking every reasonable measure to control the risks and keep the employees, tenants, visitors and residents of their building safe.

    Once completed, legionella risk assessment reports should be reviewed periodically and carried out again if any changes are made to the water system.

    What is Legionnaires Disease? 

    Legionella is a slow growing bacteria which can grow and multiply in water systems and is most commonly known for being the main cause of Legionnaires’ disease as well as the spread of other illnesses such as Pontiac fever.

    Legionnaires disease is a very serious, acute infection that primarily affecting the lungs, with symptoms closely resembling those of pneumonia, unfortunately in some cases it can be fatal.

    During the early stages of Legionnaires’ disease, a sufferer is likely to demonstrate mild, flu-like symptoms such-as:

    It is important that, once identified, Legionnaires’ disease is treated quickly as the bacterial infection can continue to grow, causing more serious symptoms. Sufferers of advanced Legionnaires are likely to experience difficulty in breathing, chest pains and a persistent cough which can be accompanied by the coughing up of phlegm, or in worse cases, blood. Survivors can often take over a year to recover fully but there can often be long term health problems as a result of the disease such as chronic fatigue and 

    neurological symptoms as well as respiratory issues.

    There is no doubt that Legionella can be incredibly dangerous which is why it is essential to carry out regular risk assessments and testing in order to prevent an outbreak from occurring.

    What is Legionella risk assessment?

    Legionella risk assessments are the legal responsibility of all landlords, employers, business owners, duty holders for commercial properties and managers of residential accommodation. They are required to assess their water systems, identify any potential issues and control the risk of exposure to legionella bacteria.

    Although a risk assessment isn’t legally required to be carried out by a licensed professional, it is always a good idea to ensure that your water supply is safe.

    Legionnaires disease can be deadly and in the event there is an outbreak at your property, having comprehensive, professional, verified documentation of your risk assessment will go a long way to proving that you took every reasonable step to ensure that your water was safe.

    The information contained on this page should be used as a general guide only. This information should not be considered a complete or exhaustive guide to Legionella risk assessment, management or control. We strongly recommend that, should you have any questions about your responsibilities or legal obligations, you contact us in the first instance. Comfort Services Group has an exceptional level of experience in Legionella risk and can assist in the identification and control of risk at your commercial property.

    At Comfort Services Group, we’re impassioned about ensuring schools are aware of their legal obligations for domestic water systems, and can provide a wealth of knowledge as well as Legionella sampling.

    Comfort Services Group is a proud member of the Legionella Control Association and adheres to the Code of Conduct set out by the Legionella Control Association.