Digital Logbooks & Record Keeping

Records are how you prove your Legionella controls exist and are working. You can run a faultless regime, but if you cannot show it, with temperatures taken, outlets flushed, valves serviced and faults fixed, then in the eyes of an inspector, an insurer or a court it may as well not have happened. HSE's ACoP L8 expects the duty holder to keep records of the risk assessment, the written control scheme, the people responsible, and the monitoring and remedial work carried out.

In practice the working record is the Legionella logbook: the live document where each temperature check, flush, inspection and corrective action is captured with a date and the name of the person who did it. A good logbook is not just a pile of readings. It shows the schedule, makes out-of-range results and the response to them visible, holds the system schematic and asset register, and tells a coherent story of a managed system over time. The gaps and the unexplained anomalies are what catch people out, not the values themselves.

A frequent question is how long records should be kept. HSE guidance commonly points to retaining monitoring records for at least five years, with the risk assessment kept for as long as it remains current and then archived. Treat these as the widely cited expectations and confirm the retention periods that apply to your sector against current HSE publications. The principle is that you should be able to demonstrate a continuous history, not just the most recent month.

This is also where moving from paper to digital earns its place. Paper logbooks get lost, water-damaged, back-dated or simply left half-filled in a plant room. A digital logbook timestamps entries as they happen, makes missed checks and overdue tasks obvious, keeps the whole history searchable, and lets a responsible person see across multiple sites without driving to each one. Going digital is not a control measure in itself, though; it improves the integrity and visibility of records, and the underlying scheme still has to be sound. (For transparency: Legionella.io is published by REMOTE TECH LTD, which makes L8log, a digital Legionella logbook.)

This section covers what a compliant record set contains, how to structure a logbook that survives an inspection, how long to keep different records, and how to make the paper-to-digital switch without losing history or staff buy-in. As with everything here, the specifics should follow your risk assessment and current HSE guidance rather than a generic template.