When should legionella training courses be refreshed?
Legionella training should be refreshed at an interval determined by the risks of the water system, the person’s duties and their demonstrated competence, rather than by a single fixed period for every organisation. Refresher training is also needed when responsibilities, systems, legislation or working procedures change, or when monitoring identifies a gap in knowledge or performance.
There is no universal expiry date for legionella training in the UK. A refresher should be scheduled through a documented review of the person’s competence, the work they carry out and the control measures they are expected to apply. The review should result in a clear decision: refresh training, provide targeted instruction, reassess competence or confirm that existing knowledge remains suitable.
What UK guidance requires
Health and safety guidance, including the principles set out in the HSE’s Legionnaires’ disease: The control of legionella bacteria in water systems and its associated guidance, places emphasis on suitable training and competence rather than a blanket certificate expiry date. Employers and dutyholders should be able to demonstrate that people involved in managing or controlling water systems understand their responsibilities and can perform their tasks correctly.
This means a certificate alone does not establish ongoing competence. The organisation should consider whether the training remains relevant, whether the individual has retained the required knowledge and whether their practical work continues to meet the site’s control procedures.
How to decide whether a refresher is due
A structured review can consider:
- the person’s current role and the specific legionella control tasks they undertake;
- their involvement in temperature monitoring, flushing, cleaning, disinfection, sampling, records or remedial actions;
- the complexity of the water systems under their control;
- the findings of audits, inspections, assessments and competence checks;
- mistakes, missed checks, incomplete records or uncertainty when procedures are explained;
- how frequently the person performs the relevant task; and
- whether the individual has had a prolonged period without carrying out the work.
Someone who performs a task regularly may demonstrate competence through routine supervision and records, while someone who carries it out infrequently may need more frequent reinforcement. The decision should be proportionate to the consequences of error and recorded with its reasoning.
Different training may need different review arrangements
Legionella training is not a single subject delivered in the same way to every employee. An overview for staff who report concerns will differ from training for a person who manages the written control scheme, and both differ from practical instruction for someone taking temperatures or carrying out routine flushing.
Refresher content should therefore match the person’s duties. It may revisit the purpose of the control scheme, routes of exposure, the importance of temperature and water-use controls, escalation arrangements, sampling limitations, record keeping and the correct response to an abnormal result. Practical personnel may also need observed instruction so that the refresher tests how work is performed, not simply whether information can be recalled.
When a short update may be enough
A full course is not always the only suitable response. A focused briefing, toolbox talk, supervised task or additional assessment may address a narrow knowledge gap, provided the organisation can show that the intervention was suitable. For wider gaps in understanding, repeated errors or a significant change in duties, a more comprehensive course and formal competence assessment may be appropriate.
Training should not be used as a substitute for correcting an unclear procedure, inadequate equipment, poor supervision or insufficient resources. If a person cannot complete a control task correctly because the system of work is defective, both the individual’s knowledge and the underlying arrangements need attention.
What should be recorded
Refresher decisions should form part of the organisation’s training and water safety records. Useful evidence includes:
- the individual’s role and relevant responsibilities;
- the training or assessment completed;
- the subjects covered and any practical elements;
- the identity and competence of the trainer or assessor;
- the outcome, including any actions still required; and
- the reason for the next review date or review point.
Where contractors carry out water hygiene work, the dutyholder should check that their training and competence are appropriate for the tasks being commissioned. A contractor’s certificate should be considered alongside the scope of work, supervision arrangements and evidence that the required procedure is followed on site.
Who should make the decision?
The responsible person or employer should ensure that refresher arrangements are defined within the organisation’s management system. Input may be needed from the person who prepared or reviews the legionella risk assessment, the water hygiene specialist, line managers and those who directly observe the work. The decision should not be based solely on an administrative certificate date; it should connect the training record with the actual risks and controls of the premises.
A competent review provides a defensible basis for deciding when training should be refreshed. It also helps distinguish between a genuine training need and a wider control failure, ensuring that learning remains relevant to the water systems and tasks for which the individual is responsible.
Refresher training should be considered alongside reviews of the legionella risk assessment and written control scheme, but it should not be postponed until those documents are formally updated. A change to the system, equipment, occupancy or water use may alter a person’s responsibilities before the paperwork is complete.
When a review identifies new or revised controls, check that the people applying them understand the change in practical terms. This may include:
- which parts of their work have changed;
- which records or monitoring arrangements must now be followed;
- what constitutes an abnormal result or failed control; and
- who must be informed if the required action cannot be completed.
Recording this link between the revised control arrangements and the training decision helps demonstrate that refresher training remains relevant to the premises, rather than being treated as a routine administrative renewal.
Discuss when your legionella training should be refreshed
Discuss your organisation’s legionella training arrangements with Blue Fish Water Management Ltd to identify an appropriate refresher approach for each role and water system.