---
title: "Lack of training: how untrained staff increase risk"
source_url: https://legionella.io/articles/lack-of-training-how-untrained-staff-increase-risk/
canonical_url: https://legionella.io/articles/lack-of-training-how-untrained-staff-increase-risk/
pillar: "Common Failures & Enforcement"
summary: "A Legionella training gap rarely looks like missing courses; it hides in ticked logs and ignored alarms. Spot the symptoms on site and fix the right competence."
primary_keyword: "Legionella training gap"
date_published: 2025-06-20
date_reviewed: 2026-06-26
author: "Legionella.io editorial team (REMOTE TECH LTD)"
reviewed_against: "HSE L8 and HSG274 guidance"
region: "United Kingdom"
license: "(c) REMOTE TECH LTD. Quote freely with attribution and a link to source_url."
---

# Lack of training: how untrained staff increase risk

A training gap almost never shows up as a blank training matrix. It shows up as a flushing log ticked perfectly every week while the same two low-use showers keep failing their samples, because the person holding the pen was never told what a flush is for. Untrained staff usually do not skip the work. They do it without understanding it, which is worse, because the paperwork then insists everything is fine.

So the productive way to treat a suspected training gap is as a fault to diagnose, not a label to staple on after an incident. Find where understanding ran out, and you have found where control fails next.

## The gap hides inside completed paperwork

Under the Approved Code of Practice (L8), the duty holder has to make sure everyone involved in controlling Legionella risk is competent for what they are asked to do, and that includes giving them the training and information to do it properly [1][3]. Competence is the legal bar, not attendance. A certificate on the wall proves someone sat in a room. It does not prove they know the action limit for a sentinel tap, or what to do when a reading comes back at 47°C.

That distinction is where most failures live. They are not honest blanks. They are confident, complete-looking records produced by people who were handed a clipboard and a route but never the reasoning. The log reads 55°C to one decimal place every week. The flush sheet is fully ticked. The TMV servicing is signed off. And the system is still drifting, because nobody in the chain could recognise a problem if it stared back at them.

## Work backwards from the symptom

When something does go wrong - a positive sample, a scald complaint, an outlet that clearly has not run in weeks - resist the reflex to phone the contractor first. Start with what you can see, and trace it back. The action limits and monitoring you are checking against should already be written into the control scheme described in HSE's technical guidance (HSG274), so the question becomes whether the people doing the work actually understood that scheme [2].

Most training-driven failures sit in one of a few places. The operative who records but never interprets. The responsible person who supervises a scheme they cannot explain. The new starter who inherited a logbook with no handover. The contractor whose report lands in an inbox no competent person ever opens. Each leaves a different fingerprint, readable back to the missing piece.

## Reading site symptoms back to the missing competence

| What you see on site | Likely competence gap | The check that confirms it | What to do |
| --- | --- | --- | --- |
| Temperature logs that read in-range every week and barely vary, even on outlets you know run hot or cold | The recorder does not know what a real reading should look like, or is back-filling from memory | Ask them to take one reading in front of you and state the threshold and why it matters | Retrain on method and action limits; where one person's diligence carries the risk, consider remote monitoring |
| A reading sits clearly out of range but nothing followed - no note, no call, no fix | Nobody told the recorder the action limit or who to escalate to | Trace one out-of-range entry forward to the action it should have triggered | Put the action limits and escalation route in the written scheme and brief people against it |
| Flush sheets fully ticked, yet the same low-use outlets keep failing | Flushing is being done as a box-tick, not understood as stagnation control | Walk the round with the operative and ask which outlets are low-use and why that matters | Role-specific briefing that ties each task to the risk it actually controls |
| The responsible person cannot explain why a control exists or what an acceptable result is | The gap is at the management tier, not the operative | Ask them to talk one control through end to end | Close the gap at the top first - a responsible person who is unsure cannot supervise anyone below them |
| Contractor reports are filed but their recommendations are never closed out | No one in-house is competent to read and act on the report | Check open actions against the last two reports | Give contractor output a named, competent owner and confirm the contractor's own competence |

The pattern to watch for: if the same weakness turns up at more than one outlet, or across more than one person, it is not a slip. It is a competence gap built into how the site runs, and a fresh disinfection will not touch the cause.

## Fixing competence, not attendance

The reflex fix is to book everyone onto a course. Sometimes that helps. Often it just adds laminates to the wall while the gaps stay open, because generic training rarely maps onto the tasks people actually perform.

Match the training to the role:

- Whoever takes temperatures or flushes outlets needs the action limits, what an out-of-range result means, and exactly who to tell - not a primer on Legionella microbiology.
- The responsible person needs to understand the written scheme well enough to supervise it and to challenge a record that looks wrong.
- The duty holder needs enough grasp to judge whether their oversight is real or merely nominal.
- Anyone reading contractor reports needs to be competent to act on them, or those recommendations may as well not exist.

Write down who is trained on what, and keep it current as people and tasks change. Where manual readings lean heavily on one person's diligence, reducing that dependence is itself a control: automated or [remote temperature monitoring](https://legionella.io/articles/remote-water-temperature-monitoring-benefits-and-setup/) takes the human-error variable out of the most error-prone task. And if your records look full but tell you nothing, the fault may be the record design as much as the recorder - [Incomplete records: the pitfalls of bad documentation](https://legionella.io/articles/incomplete-records-the-pitfalls-of-bad-documentation/) covers that failure mode in detail.

## When it is one person, and when it is the system

There is a difference between an individual who needs a refresher and an organisation with no functioning competence. One missed escalation from an otherwise capable operative is a coaching conversation. A responsible person who cannot explain the scheme, contractor reports stacking up unread, and a logbook nobody reviews together describe a system failure - and that is the version HSE takes most seriously, because the duties expect foreseeable risk to be assessed, controlled, monitored and reviewed by competent people, not simply paperworked [3].

Contractor competence is part of your competence. Outsourcing the task does not outsource the duty, and you are expected to use providers who can demonstrate they are competent; the Legionella Control Association code of conduct is a common reference point for judging that [5]. If you cannot tell whether your contractor is doing a good job, that uncertainty is its own gap.

## What training can and can't do

Training is one control among several, and it earns its place only when it changes what people do on site. It is not a substitute for a competent, site-specific risk assessment, and no course sets your action limits for you - those come from your scheme, your system and your users. Sampling can verify control, but its frequency follows the risk assessment rather than a calendar, so a clean result never excuses an untrained team [4]. Treat anything here as a prompt to check your own arrangements with a competent adviser before you rely on a figure.

## Common questions

### Does a training certificate make someone competent?
Not on its own. A certificate records that someone attended; competence is the ability to perform the specific task correctly and to recognise when something is wrong. The duty holder is responsible for ensuring genuine competence, not just collecting certificates [1][3].

### Who in our building actually needs Legionella training?
Anyone whose actions affect control: whoever takes temperatures or flushes, the responsible person supervising the scheme, the duty holder providing oversight, and anyone expected to act on contractor reports. The depth differs by role - an operative needs action limits and escalation, not microbiology.

### How often should Legionella training be refreshed?
There is no single legal interval. Refresh when the risk assessment indicates, and sooner after a change of staff, system, contractor or control method, or after any failure that exposed a gap. Confirm the right frequency through your own assessment rather than a fixed rule [3].

## Related reading

- [Incomplete records: the pitfalls of bad documentation](https://legionella.io/articles/incomplete-records-the-pitfalls-of-bad-documentation/)
- [Ignoring flushing routines and the consequences](https://legionella.io/articles/ignoring-flushing-routines-and-the-consequences/)
- [Legionella prevention in industrial facilities](https://legionella.io/articles/legionella-prevention-in-industrial-facilities/)
- [Remote water temperature monitoring: benefits and setup](https://legionella.io/articles/remote-water-temperature-monitoring-benefits-and-setup/)

## Sources

[1] HSE, "Legionnaires' disease. The control of legionella bacteria in water systems - Approved Code of Practice and guidance (L8)". https://www.hse.gov.uk/pubns/books/l8.htm
[2] HSE, "Legionnaires' disease: Technical guidance (HSG274)". https://www.hse.gov.uk/pubns/books/hsg274.htm
[3] HSE, "Legionnaires' disease - what you must do". https://www.hse.gov.uk/legionnaires/what-you-must-do/index.htm
[4] HSE, "Testing and monitoring your water system for legionella". https://www.hse.gov.uk/legionnaires/testing-monitoring-water-system.htm
[5] Legionella Control Association, "Code of Conduct for Service Providers". https://www.legionellacontrol.org.uk/