What should a legionella inspection report contain?

A useful legionella inspection report is an auditable account of how water-system controls were assessed, what evidence supports the conclusions, and what the organisation needs to do next. It should allow a responsible person, auditor or contractor to understand the site’s current position without relying on informal explanations or assumptions.

The report should be dated and clearly identify the premises, the organisation commissioning the inspection, the assessor and the purpose of the work. It should also state whether the inspection was routine monitoring, a review of existing control arrangements, a follow-up to previous concerns, or part of a wider risk assessment. This context is important because the scope and depth of an inspection should be judged against its stated purpose.

• Scope and methodology: the report should explain how the assessment was carried out, including the information reviewed, the parts of the water-management arrangements considered and any inspection methods used. It should identify areas that could not be accessed or records that were unavailable, rather than implying that the whole site was examined when it was not.
• Site and system context: relevant details may include occupancy, vulnerable users, changes in building use, periods of closure, alterations to plumbing and any known history of contamination or control problems. These factors help explain why particular findings matter and whether existing controls remain suitable.
• Control arrangements: the report should examine whether duties are clearly allocated and whether the written control scheme is suitable for the systems in use. It should consider management arrangements such as appointed roles, escalation routes, contractor oversight, staff competence, records and the process for reviewing the scheme when circumstances change.
• Evidence quality: conclusions should be linked to observable evidence. This may include dated records, photographs, equipment readings, maintenance documents, schematic drawings, inspection notes and interviews with relevant personnel. A report should distinguish between something directly observed, information supplied by the client and an assessor’s professional judgement.
• Water-testing information: where samples have been taken, the report should provide enough detail to trace each result to the relevant location and date. It should identify the sampling approach, sample references, laboratory information, analytical method where relevant and any limitations affecting interpretation. Results should be explained in relation to the site’s control arrangements and the advice applicable to the particular system, rather than presented as isolated numbers.
• Risk grading and rationale: significant issues should be prioritised consistently, with an explanation of why they present a concern. The reasoning should take account of factors such as the likelihood of conditions that support legionella growth, the potential for exposure, the people who may be affected and the effectiveness of existing safeguards. A simple pass-or-fail statement is rarely sufficient for meaningful management.

Recommendations should be specific enough to be acted upon. Each should describe the deficiency, the proposed remedy, the person or organisation expected to progress it, the level of urgency and any dependency on further investigation. Where a recommendation is not immediately practicable, the report should identify suitable interim controls or management measures rather than leaving the issue as an unresolved general warning.

A strong report also records the basis for closing actions. Follow-up evidence might include updated records, photographs, repeat readings, maintenance documentation, revised schematics or confirmation that a control measure has been implemented. The report should make clear which items remain open, which have been completed and whether completion has been verified. This creates a reliable audit trail and prevents recurring defects from being treated as new issues without recognising their history.

Limitations should be stated plainly. Examples include inaccessible plant, incomplete asset information, unavailable monitoring logs, restricted sampling locations or conditions that could not be assessed during the visit. These limitations do not necessarily invalidate the inspection, but they may mean that additional work is needed before the organisation can rely on the conclusions.

Finally, the report should set out how its conclusions fit into ongoing water safety management. It should identify any need to update the risk assessment, control scheme, training, monitoring arrangements or planned maintenance, and indicate when the findings should be reviewed. The document should be retained with the wider legionella records so that future inspections can compare current evidence with earlier decisions and demonstrate how the organisation has managed identified risks.