Protecting your water system from legionella bacteria requires a Legionella Risk Assessment. Find out how to start a risk assessment.
Published 23 Nov 2022
Legionella is a type of bacteria that can cause a severe lung infection known as Legionnaires' disease. Air conditioning systems, hot tubs, and even household plumbing often contain bacteria, which thrives in warm, stagnant water. People can become infected with Legionella by breathing in contaminated droplets of water. The bacteria can cause various symptoms, from a mild flu-like illness to severe pneumonia. In some cases, Legionnaires' disease can be fatal. Prevention of exposure to Legionella involves maintaining cleanliness in potential breeding grounds for the bacteria.
An LRA is a process used to identify and assess the risks posed by legionella bacteria in water systems. LRAs are essential because they can help to prevent outbreaks of Legionnaires’ disease. Most Legionnaires’ disease outbreaks occur in places where contaminated water is available, such as hotels, hospitals, and cruise ships. In addition, LRAs can also help to ensure that water systems are properly maintained, thereby reducing Legionella risks.
LRAs involve two processes: physical inspection and risk assessment.
The physical inspection involves the following process:
Risk assessment involves the following process:
A report is then prepared that documents the assessment findings and outlines any recommended control measures.
Not all countries require Legionella risk assessment forms or testing. However, it is strongly encouraged by health professionals from different countries, as it can help stop the spread of Legionnaires’ disease. In the US, although there is no federal law requiring property managers and landlords to conduct risk assessments or testing of any sort for Legionella, many authorities have argued that it should be to help promote safer drinking water and protect public health. Officials in some states have taken to conducting their own efforts to help manage Legionella through state-specific laws, particularly for cooling towers, water systems, healthcare facilities, and other related buildings.
However, there are some countries that require legionella testing and risk assessments. These include the following:
Anyone can perform the LRA. But, the person who understands the facility’s water management systems should perform the LRA. The accountable individual should also have enough power to implement the audit findings. This individual must guarantee conformance and, in the end, prevent Legionella bacteria from developing.
According to ACoP L8 regulations, a guidance document released by the UK’s Health and Safety Executive, the person conducting the assessment and implementing any control measures must have the “necessary expertise, experience, and knowledge.” And they are “properly trained to safely and effectively complete their tasks.”
Landlords with few tenants can perform the LRA themselves-provided they have the proper training. If the property is complex or has many tenants, it would be best to hire a professional to conduct the assessment. This way, they can ensure optimal safety for the people in the building.
The industry standard was LRA should be conducted at least every two years. However, per advice by the Approved Code of Practice L8 (ACoP L8), assessment must be conducted “more frequently if there is a valid reason to do so.” to keep the assessment updated.
LRA updates may be necessary for the following reasons:
In general, any time there is a change that could potentially affect the growth or spread of Legionella bacteria, an LRA should be conducted.
Landlords, employers, and property managers can use the following steps as a guide in performing a Legionella risk assessment and in managing Legionella risks:
The first step in carrying out a Legionella risk assessment is to determine if there is a risk. Check if any of the top 3 Legionella-related risk factors are present. Also check for other Legionella-related risk factors such as:
If there is currently no risk, determine if there is a possibility that a risk will occur. If there is no reasonably foreseeable risk, according to the HSE, the Legionella risk assessment is complete.
If there is a risk, determine the risk level. If the risk level is low and risk is being properly managed to comply with the law, according to the HSE, the Legionella risk assessment is complete. Indications that the Legionella risk level is low (based on examples given by the HSE):
Eliminate manual tasks and streamline your operations.
To test for Legionella, the HSE recommends doing the following:
Aside from cases where control measures do not seem to be effective, Legionella testing is typically only carried out for cooling tower systems, though it is also recommended for other open systems such as evaporative condensers and spa pools. Although in recent years, it has also been encouraged for establishments in which water is constantly heated and cooled repeatedly and then distributed for human use or consumption. Additionally, the HSE states that these systems should be tested for Legionella at least quarterly. However, take note that UK law does not require a Legionella test certificate, nor does the HSE recognize it.
Under the UK Notification of Cooling Towers and Evaporative Condensers Regulations 1992 (NCTEC), the local authority must be notified in writing if there is a cooling tower or evaporative condenser on site, and details about where it is located should be included. The local authority must also be notified when such devices are no longer in use.
Under the UK Reporting of Injuries, Diseases and Dangerous Occurrences Regulations (RIDDOR), cases of Legionellosis (Legionnaires’ disease) in employees who have worked on cooling towers or on hot and cold water systems that are likely to be contaminated with Legionella must be reported.
For properties that are left vacant, water should not be allowed to stagnate within the water system and outlets on hot and cold water systems should be used at least once a week.
Legionnaires’ disease is a potentially deadly illness. An infected person can experience the following:
These symptoms can appear anywhere from 2 to 10 days after exposure to the bacteria. In severe cases, Legionnaires’ disease can lead to pneumonia, which can be fatal. Older people with weakened immune systems are at the highest risk for developing Legionnaires’ disease.
A professional Legionella risk assessment can take anywhere from a few hours to a few days, depending on the size and complexity of the property. Longer if there are certain restrictions in place on-site.
While there is no specific legal requirement for landlords to have a Legionella risk assessment, the Health and Safety law recommends that all landlords assess and identify potential risks and take steps to control them.
The Health and Safety Executive recommended that landlords take the following simple steps to minimize the risks of Legionella:
Aside from LRA, there are other inspections and assessments that landlords need to carry out, such as:
Landlords, building managers, and persons in charge of performing the assessment can use SafetyCulture (formerly iAuditor) to help streamline the assessment process. With SafetyCulture, you can:
This printable legionnaires risk assessment template is according to the Health and Safety Executive (HSE) Control of Legionella Bacteria in Water Systems for auditing cooling towers. Use this template to efficiently inspect an unlimited number of cooling towers and evaluate a site’s water treatment program and written scheme for controlling the risk of exposure to legionella bacteria. The landlord or any competent legionella-responsible person can easily customize this template according to the design and construction, operation and maintenance, monitoring, and cleaning and disinfection of their cooling tower systems.
Rob Paredes is a content contributor for SafetyCulture. He is a content writer who also does copy for websites, sales pages, and landing pages. Rob worked as a financial advisor, a freelance copywriter, and a Network Engineer for more than a decade before joining SafetyCulture. He got interested in writing because of the influence of his friends; aside from writing, he has an interest in personal finance, dogs, and collecting Allen Iverson cards.
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