Primary legislation
Official sourceHealth and Safety at Work etc. Act 1974
Sets the overarching duties to protect employees and others who may be affected by work activities, including risks associated with water systems.
Legionella risk assessment and water hygiene
Legionella risk assessment and water hygiene control.
Establish the foreseeable risk presented by hot- and cold-water systems, define the measures required to control exposure and give the dutyholder a practical basis for monitoring, record keeping and review.
- Legionella risk assessments for relevant water systems
- Risk-assessment reviews following material change
- Written control schemes and responsibility mapping
- Water-system schematics and asset reviews
Scope confirmed firstPremises, systems and required output agreed before instruction.
Appropriate competenceThe delivery route is matched to the agreed specialist scope.
Usable written evidenceReports and findings are returned against the correct site.
Discipline-specific methodThe approach and evidence are matched to legionella risk assessments and water hygiene.
Service overview
What should a Legionella risk assessment establish?
A suitable and sufficient assessment considers the water system, operating conditions, people who may be exposed, existing precautions and any further control measures required. The resulting arrangements should identify responsibilities, monitoring requirements and the events that trigger review.
Get the right scope for my siteRegulatory framework
The legislation and guidance behind the service.
These summaries identify the principal framework in England, Wales or Great Britain as labelled. The exact duty depends on jurisdiction, premises, equipment, use and the party in control.
COSHH 2002
Official sourceControl of Substances Hazardous to Health Regulations 2002
Requires employers to assess and prevent, or where prevention is not reasonably practicable adequately control, exposure to hazardous biological agents such as Legionella.
HSE ACOP L8
Official sourceLegionnaires’ disease: The control of legionella bacteria in water systems
Provides approved practical guidance on assessing the risk, appointing competent assistance, implementing precautions and keeping appropriate records.
HSE HSG274
Official sourceLegionnaires’ disease: technical guidance
Provides system-specific technical guidance for hot and cold water systems, evaporative cooling systems and other risk systems.
Scope of service
A defined instruction, matched to the premises and duty.
Before appointment, we confirm the required output, available evidence, access limitations and the areas, systems or assets included in the instruction.
Legionella risk assessments for relevant water systems
Risk-assessment reviews following material change
Written control schemes and responsibility mapping
Water-system schematics and asset reviews
Logbook, monitoring and control-effectiveness reviews
Risk-based sampling coordination where appropriate
Reporting output
A clear technical record for the dutyholder.
- A written Legionella risk assessment or review report matched to the scope
- A system description or schematic and relevant asset schedule where included
- Prioritised controls, responsibilities and monitoring requirements
- Clear review triggers, record gaps and a practical evidence plan
How it works
From defined instruction to issued report.
- 01Scope the system
Confirm premises, occupants, water assets, previous information and access.
- 02Review the records
Assess schematics, earlier reports, monitoring data and control responsibilities.
- 03Inspect and assess
Examine the water system and how current controls operate in practice.
- 04Issue the control picture
Document risks, responsibilities, actions, monitoring and review triggers.
Built for the people managing the risk
Support shaped around the duty, premises and decision.
Choose the route closest to your role and property type. The technical scope stays specific to this service while access, communication and reporting reflect the operating environment.
Facilities management companies
Coordinate water-risk evidence and responsibilities across multiple client sites.
See the sector approachCare & supported living
Address complex systems and occupants who may be more susceptible.
See the sector approachSchools & academy trusts
Plan reviews around term-time access, changing occupancy and estate records.
See the sector approachPublic, leisure & community
Manage varied water use, intermittent outlets and publicly accessible facilities.
See the sector approachTechnical and procurement questions
Scope, duties and deliverables—set out clearly.
The correct service depends on the premises, systems, equipment, use and dutyholder position. These points are confirmed before appointment.
Request a scoped quotationWho is responsible for managing Legionella risk?
The employer or person in control of premises is the dutyholder. They may appoint a competent responsible person and specialist support, but they retain responsibility for ensuring that suitable arrangements are in place.
How often should the risk assessment be reviewed?
There is no single statutory annual or two-year interval. Review is required when there is reason to believe the assessment is no longer valid—for example after a material system, use, occupancy or control change.
Is water sampling always required?
No. Sampling should be justified by the risk and control strategy; it is not a substitute for effective temperature control, management of stagnation, cleanliness and correct system operation.
Will I receive a Legionella certificate?
The legislation does not prescribe a generic Legionella certificate. The relevant evidence is a suitable risk assessment, a written control scheme where required, clear responsibilities and records showing that the controls are being implemented.
Can several premises be managed as one programme?
Yes. Surveys, reporting and monitoring can be coordinated at portfolio level, while each distinct site and water system retains an appropriate local assessment, asset information and named responsibilities.
Request a quotation
Define the premises, required output and timescale.
Tell us about the property, system or equipment involved and what has prompted the instruction. We will confirm the information required before issuing a proposal.