How often Should a domestic legionella risk assessment be carried out?

We will be sending out a memo to all our clients later this week – Relating to the HSEgov recent update. Due to the nature of legionnaires and the 2016 stats the requirement for a new LRA every 24 months has been removed and the LRA should be carried out on a regular basis.

As industry professionals, we are being asked exactly what schedule is best.

We will be notifying all our clients as follows:
After an initial legionella risk assessment is carried out – (So if an assessment is carried out in January 2017)

The legionella risk assessment should be carried out if a domestic/residential property is vacant for 4 weeks or more (This should be before the new tenant or owner moves in) So in this example, if the property is vacant until February (8 weeks) then a single re test is sufficient if the tenant/owner occupies at 8 weeks –

If the property is occupied – The legionella risk assessment should be carried out at a minimum – on an annual basis (January 2018 in this example)

The legionella risk assessment should be carried out after any building or plumbing works which included working on either cold or hot water pipes, tanks, kitchen, bathroom etc. (This includes external garden taps which are also tested)
Crystal H2o provide only guidelines on what we believe to be the minimum – and home owners & landlords must decide on what schedule best suits their own legal responsibility.

There are landlords who insist on LRA every 6 months even when occupied. In a court of law under prosecution from the local authority or in response to a penalty from the HSE Inspector, we must be able to prove that adequate care has been taken in order to continuously assess the legionella threat and minimise the risk to tenants.
It is no wonder that not only tenanted properties but also home owners are now instructing Crystal H2o to carry out legionella risk assessments.