Privacy Settings Legionella Risk Assessment – Tips for Landlords - Aquacert
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Landlords have a duty to keep their properties safe and free from hazards. Firstly by making sure that their rental units are structurally sound. Then internally, they have the responsibility of making sure that the health and safety of their tenants is not compromised. This is why it is essential for them to conduct a Legionella risk assessment – here are some tips for Landlords

Legionella risk assessments entail a thorough and systematic evaluation of a property’s water system against potential risks, like Legionella.

Legionella bacteria cause Legionnaires’ disease and are commonly found in warm freshwater. A small population of the bacteria can be found in the residential water supply, even after water from freshwater sources has been sanitised and processed. At low levels, the bacteria pose minimal risks. However, when the right conditions are met, the bacterial population can multiply. When a person with a weakened immune system inhales contaminated water droplets, they can succumb to Legionnaires’ disease.  Remember – there is a 10-12% mortality rate for people who contract this disease.

A Legionella risk assessment does not eliminate the bacteria from the water supply, however, through proper management and enforcement of the correct control measures, the risk of the Legionella bacteria wreaking havoc on public health is minimised.

Although the risk of Legionella contamination in residential properties is relatively low, it is prudent for property owners to conduct a Legionella risk assessment to identify potential areas of concern.

Risk assessment tips

One of the first things that needs to be considered is the last time the property’s water system was used. Ideally, hot and cold water systems should be used at least once a week. If the property has been vacant for an extended period of time, the water system should either be drained or flushed.

Property owners should also carefully evaluate the water tanks on their properties as these are prone to Legionella exposure.

Water temperature is another key point that should be scrutinised during the assessment. Legionella bacteria thrive in warm water and if hot water is stored in a tank, the temperature should be 60°C minimum. On the other hand, the addition of instant water heaters can significantly lower risk for Legionella.

Finally, property owners should also make sure that showerheads are cleaned and disinfected regularly. Scale is an ideal food source and also provides a perfect home for legionella bacteria.

Controlling Legionella

Before the new occupants of a rental unit move in, the property owner should flush the water system.

  • In addition, a tight lid over cold water tanks is a simple yet effective measure which can help prevent the entry of dirt/debris, insects and birds.
  • If there are redundant pieces of pipework, it is highly advisable to remove these.
  • Tenants can also contribute greatly to the prevention of a Legionnaires’ disease outbreak. For one, they can alert their landlords about problems with the hot water system or if debris can be found in the water.
  • If there are water outlets that are not used on a regular basis, the tenants can turn these on for a few minutes weekly.
  • Occupants of a rental property should also ensure that the showerheads are cleaned and disinfected.
  • Finally, once the water temperature has been set to the recommended levels, tenants should not tamper with these settings.

Work together, reduce the risk

What happens when the landlord keeps the water system clean and keeps the tenants well informed of the risks? By encouraging the tenants to do preventive measures, buildings are more likely to be free from Legionella bacteria.

Landlord Legionella Risk Factors