Legionella Risk Assessment
A Legionella Risk Assessment examines how legionella bacteria could enter, multiply within and spread through an organisation’s water systems. Blue Fish Water Management Ltd identifies hazards, evaluates risk and sets out control measures to support HSE L8 compliance.
Technical Expertise for HSE L8-Compliant Assessments
A competent Legionella Risk Assessment is a documented review of water systems, equipment, usage and management arrangements that could create conditions for legionella growth or transmission. It considers factors such as stored and circulated hot water, outlets, dead legs, temperature control, stagnation and the needs of people who may be more vulnerable to infection.
Blue Fish Water Management applies practical knowledge of domestic, commercial and industrial systems to distinguish significant hazards from routine maintenance issues. The assessment records relevant assets, identifies weaknesses in existing controls and sets out proportionate actions, which may include monitoring, cleaning, disinfection, remedial work or further investigation.
The assessment also clarifies the responsibilities of the dutyholder and nominated responsible person. Findings are presented in a usable report, supported by appropriate evidence and recommendations, so that control measures can be implemented, reviewed and retained as part of the organisation’s water safety records under HSE L8 and associated guidance.
What a Legionella Risk Assessment Involves
Each assessment follows a clear sequence: confirm the site’s requirements, review available water system information, arrange appropriate inspection activities, record findings, explain the outcome, and identify proportionate actions for maintaining or improving legionella control.
- 1
Confirm the assessment scope
The process begins by confirming the premises covered, the water systems in use, relevant occupancy patterns and the organisation’s responsibilities. This establishes what the assessment needs to examine and which records or personnel should be available.
- 2
Review existing information
Available schematic drawings, asset registers, monitoring records, maintenance documents and previous assessment reports are reviewed before the site inspection. Gaps or inconsistencies in this information can then be checked rather than assumed.
- 3
Inspect the water systems
The assessor examines accessible plant, storage and distribution arrangements, outlets, points of use and areas where water may stagnate. Observations are considered alongside how the systems are operated, maintained and used in practice.
- 4
Evaluate control arrangements
Evidence from the inspection is compared with the organisation’s current procedures for temperature management, monitoring, cleaning, maintenance and escalation. The assessment considers whether these arrangements are suitable for the systems and the people using the premises.
- 5
Document the findings
The completed report records the systems assessed, relevant observations, identified risks and the evidence supporting the conclusions. Clear descriptions help the dutyholder and responsible person understand which issues require attention and why.
- 6
Agree proportionate next steps
Recommendations are prioritised according to the findings and may involve correcting management arrangements, improving records, carrying out remedial work or obtaining further technical information. The resulting actions can be incorporated into the organisation’s ongoing water safety management arrangements.
Documented Findings and Technical Reporting
The completed Legionella Risk Assessment provides a traceable record of the site’s water safety position at the time of inspection. It brings together the systems reviewed, locations considered, documents and observations, with supporting records where these are available.
Reporting explains how each finding relates to legionella risk, controls and the duties of the responsible person. Temperature results, equipment condition, evidence of stagnation and management arrangements can be documented clearly, while limitations or areas requiring confirmation are identified rather than assumed.
The report separates factual observations from recommendations, making it easier to allocate actions and demonstrate follow-through. Blue Fish Water Management presents findings in a format suitable for review, contractor instruction and retention within HSE L8 water safety records.
Legionella Risk Assessment: Your Questions Answered
When is a Legionella Risk Assessment required?
If significant risks are identified, the report prioritises corrective actions, assigns responsibility and indicates suitable verification. Remedial work may include temperature adjustments, cleaning, disinfection, component replacement or investigation as appropriate.
Read moreWho is responsible for arranging a Legionella Risk Assessment?
The dutyholder remains responsible for arranging a suitable Legionella Risk Assessment, usually through the nominated responsible person. They must ensure competence, provide relevant information, and retain oversight of resulting actions.
Read moreHow often should a Legionella Risk Assessment be reviewed?
Review frequency depends on changes to water systems, use, occupancy, equipment, controls or vulnerable occupants. Reassess following significant alterations, incidents or evidence that existing arrangements no longer suitable and effective.
Read moreIs a Legionella Risk Assessment suitable for a dental practice?
Yes. A dental practice Legionella Risk Assessment examines dental-unit waterlines, hot and cold services, storage, outlets, usage patterns and vulnerable occupants, then documents proportionate control requirements for practice water-management arrangements.
Read moreWhat standards should a Legionella Risk Assessment follow?
A Legionella Risk Assessment should reflect HSE L8 principles and relevant HSG274 guidance, alongside applicable health and safety duties. It must be competent, site-specific, evidence-based and proportionate to identified risks.
Read morePractical Assurance
Blue Fish Water Management provides consistent, evidence-led advice and dependable Legionella Risk Assessment delivery across commercial, industrial and domestic settings.
Discuss Your Legionella Risk Assessment Requirements
Discuss your site’s Legionella Risk Assessment requirements with the Blue Fish team to clarify the appropriate scope, existing information and any practical constraints. We can then outline the next step for reviewing your water systems and management arrangements.