Can a legionella risk assessment near me cover multiple sites?

Yes, a multi-site legionella risk assessment can be managed as a coordinated portfolio exercise, but it must still account for the conditions and risks at every individual premises. A consistent assessment method can be applied across the estate without treating all buildings, water systems or occupants as though they are the same.

The most reliable approach combines a portfolio-level review with site-specific assessments. The portfolio review establishes the overall management structure, common procedures, responsibilities and control standards. Each site assessment then records the actual water systems, points of use, occupancy profile, vulnerable users, operational activities and existing control measures at that location.

What can be assessed consistently?

• The assessment methodology and reporting format.
• The way hazards, existing controls and recommended actions are recorded.
• Responsibilities for managing water systems and responding to identified risks.
• Monitoring, inspection and record-keeping arrangements.
• Escalation processes for defects, failed controls or changing site conditions.
• Training and communication requirements for staff involved in water safety management.

Using a common framework makes it easier for a facilities or estates team to compare findings and manage actions across several premises. It can also identify recurring issues, such as inconsistent temperature monitoring, unclear ownership of responsibilities or differences in maintenance records.

What must be considered separately at each site?

Each premises has its own physical and operational characteristics. The assessor should verify the design and condition of the water systems rather than relying solely on information supplied at portfolio level. This may include cold-water storage, hot-water generation and distribution, secondary return arrangements, showers, taps, thermostatic mixing valves, seldom-used outlets, safety showers, process equipment and any other systems that could create a legionella risk.

Occupancy and use are equally important. A care setting, office, warehouse, hotel, healthcare-related premises, educational building or industrial site may have very different patterns of water use and different categories of people who could be exposed. Areas that are vacant, intermittently occupied, undergoing refurbishment or used by vulnerable individuals may require particular consideration.

Site-specific factors can also include:

• Changes to the building layout or water installation.
• Dead legs, redundant pipework or low-use outlets.
• Water systems serving separate units or tenants.
• Plant rooms or storage areas with restricted access.
• Failures in insulation, temperature control or circulation.
• Local maintenance arrangements and contractor responsibilities.
• Records showing whether monitoring and remedial actions have been completed.

These details determine whether a recommendation is suitable for one location or should be applied more widely. A control that is practical in a small office may not be appropriate for a large industrial installation, and a procedure used at one site may not reflect the equipment or responsibilities at another.

How should the findings be reported?

For a multi-site programme, reporting should make the relationship between the individual assessments and the wider management system clear. This may involve a separate report for each premises, supported by a portfolio summary showing common findings, site-specific risks, outstanding actions and priorities. The documentation should identify which recommendations apply to one site and which require a coordinated response.

Reports should also make clear where the assessment boundary lies. For example, a landlord, managing agent, tenant, facilities provider and maintenance contractor may each control different parts of a water system. Recording these interfaces helps prevent gaps in responsibility, particularly where systems or records are shared.

When does the portfolio need to be reviewed?

A multi-site assessment is not a substitute for ongoing review. Individual sites should be reconsidered when there are significant changes to the water system, building use, occupancy, responsible personnel or maintenance arrangements. Findings should also be revisited where monitoring indicates a loss of control or where remedial work changes the system.

It is useful to maintain a central action register alongside the site reports. This can show the action required, the premises concerned, the responsible person, the evidence needed to close the action and whether further verification is appropriate. The register should not replace the underlying assessment; it provides a practical way to manage the results.

Blue Fish Water Management Ltd supports organisations with legionella risk assessments and wider water hygiene management across multiple premises. Its approach can include site inspections, review of existing records, practical recommendations and advice on maintaining consistent control arrangements, with UK-wide support for organisations managing geographically distributed estates.

Before commissioning a multi-site assessment, an organisation should define the premises included, identify available system information, confirm access arrangements and establish who manages the water systems at each location. This allows the assessor to distinguish between portfolio-wide controls and risks that require a response at a particular site.