Legionella risk assessment for Universities and student accommodation

Updated 7 September 2026

Student accommodation is legionella management at awkward scale. A purpose-built student accommodation block can hold several hundred en-suite rooms fed by shared risers and large calorifiers, and every one of those showers is an aerosol outlet. The defining problem is the calendar: a block can empty almost completely over the summer, leaving hundreds of outlets standing unused for months, then fill again within a single intake weekend in September. The window between those two events is when the risk peaks and when the recommissioning work has to happen.

The written scheme for a student block normally separates three things: the summer void management (either a documented weekly flushing regime across empty floors, or a planned drain-down and recommissioning flush before intake), the in-term monitoring (sentinel outlet temperatures, calorifier checks, shower-head descaling), and the handover records that prove the block was made ready before students moved in. Rooms let as summer conference accommodation or used for staff break the void rule, because occupied outlets still need routine control.

On a wider campus the picture fragments further. The university estates team may hold the duty for the academic buildings, laboratories and sports facilities, while a private PBSA operator holds the duty for the halls, and letting or management agreements have to make that line explicit. A university is also an employer with a duty to staff in its offices and labs, so the campus needs an overarching assessment even where individual buildings are contracted out. The duty under ACOP L8 cannot be delegated to a contractor, only the legwork can.

Is it legally required?

Universities and student accommodation operators are duty holders under the Health and Safety at Work Act 1974, including the section 3 duty to people other than employees, which is what brings students within scope. ACOP L8 and HSG274 Part 2 set out how the duty is discharged in hot and cold water systems. Halls of residence are treated as non-domestic premises for these purposes even though they are also homes, and management agreements between universities, PBSA operators and managing agents should state clearly who the duty holder is for each building.

Who is the duty holder?

The duty holder is whoever has control of the premises or the water system. For universities and student accommodation premises, this is usually the employer, owner, landlord, or managing agent. The duty cannot be contracted out: you can hire a water hygiene consultant, but the legal responsibility still sits with you.

If you are unsure who holds the duty for your premises, see: Who is responsible for a legionella risk assessment?

What the assessment should cover

ACOP L8 sets out five things a suitable and sufficient assessment must do:

1. Identify and assess sources of risk across the whole water system, including stored hot and cold water, dead legs, rarely used outlets, and any equipment that generates aerosols
2. Produce a written scheme for preventing or controlling the risk, with specific tasks, temperatures, and frequencies
3. Implement, manage, and monitor the scheme in practice, not just on paper
4. Keep records of the assessment, the scheme, monitoring results, and any remedial action taken
5. Appoint a competent person (often called the "responsible person") to be accountable for the scheme

Specific water system risks to check

For universities and student accommodation premises, assessors typically pay close attention to:

• Hot water storage temperatures (calorifiers must reach 60°C throughout)
• Hot water distribution temperatures (50°C within one minute at outlets)
• Cold water storage tank condition, lid seal, and temperature (below 20°C)
• Dead legs, redundant pipework, and little-used outlets
• Shower heads, flexible hoses, and thermostatic mixing valves
• Any cooling tower, evaporative condenser, or spa pool (these are notifiable to the local authority under the Notification of Cooling Towers and Evaporative Condensers Regulations 1992)

How often to review

There is no fixed legal interval, but ACOP L8 requires that the assessment is reviewed regularly and whenever there is reason to believe it may no longer be valid. For most universities and student accommodation premises, that means at least every 12 months and sooner after any of the following:

• Changes to the water system (new pipework, fittings, equipment)
• Changes to the use of the building or the number of occupants
• A positive legionella test result or a case of Legionnaires' disease linked to the premises
• Prolonged periods of low occupancy or system shutdown (a risk during holidays, term breaks, or refurbishment)
• New guidance from HSE

Typical cost

A professional legionella risk assessment for universities and student accommodation premises typically costs between £500 and £2000, depending on the size of the building, the number of water outlets, and whether there are any cooling towers or evaporative condensers (these add significantly to the cost because of the statutory inspection regime).

Use our cost calculator for an estimate based on your specific water system.