Most rented properties are low risk but nevertheless Landlords must undertake a risk assessment to determine the risk of Legionella which causes Legionnaires’ disease, a potentially fatal form of pneumonia. Everyone is susceptible to infection but the risk is increases with age and in people suffering from pre-existing health conditions.
The bacterium Legionella pneumophila are widespread in natural water systems, eg rivers and ponds, but can also be found in purpose-built water systems such as hot and cold water systems and spa pools where the water is maintained at a temperature high enough to encourage growth. If you decide that the risks are insignificant and are being properly managed to comply with the law, your assessment is complete. You will not need to take any further action, but it is important to review your assessment periodically in case anything changes in your system.