Compliance for UK schools
Water Hygiene Monitoring for Schools
Water hygiene monitoring is the day-to-day routine that keeps a school's legionella risk under control - the temperature checks, flushing, and outlet management that put a written scheme of control into practice, and the records that prove it happened. It is the operational counterpart to the legionella risk assessment: the assessment decides what controls are needed, and monitoring is how those controls are delivered and evidenced week after week. This guide covers the monitoring tasks and typical frequencies, holiday-closure procedures, what to do when a result is out of range, who can carry out the checks, and the records to keep. For the underlying duty, the responsible person, and the written scheme itself, see our legionella risk assessment guide.
How is monitoring different from the legionella risk assessment?
The legionella risk assessment is a point-in-time evaluation that identifies the hazards in a water system and decides the controls. Water hygiene monitoring is the ongoing routine that implements those controls and generates the evidence that they are working. The assessment tells you what to do and to what parameters; monitoring is the proof you are doing it. A current risk assessment with no monitoring records is a compliance gap - and monitoring carried out without a current assessment or written scheme may be measuring the wrong things. The two guides pair up deliberately: read this one for the operational routine, and the legionella risk assessment guide for the duty, the responsible person, and the written scheme of control that these tasks come from.
Sources: HSE ACOP L8; HSE HSG274, Part 2: hot and cold water systems
What monitoring is required, and how often
- •Monthly temperature monitoring of sentinel outlets - the nearest and furthest hot and cold taps on each system. Hot water should reach 50°C or above within one minute of running; cold water should stay below 20°C.
- •Weekly flushing of low-use outlets - taps, showers, and other water points not used regularly - running them long enough to replace the standing water and prevent stagnation.
- •Quarterly checks of calorifier (hot water cylinder) temperatures, confirming stored hot water is held at around 60°C, and inspection of cold water storage tank temperatures and condition.
- •Annual temperature profiling of the full hot and cold water systems, plus inspection and, where specified, cleaning and disinfection of tanks, showerheads, and thermostatic mixing valves (TMVs) - usually carried out by the water hygiene contractor.
- •The exact tasks, frequencies, and parameters come from the school's written scheme of control. The figures above are the typical pattern in schools, following HSE guidance (HSG274), not a one-size-fits-all rule.
Sources: HSE HSG274, Part 2: hot and cold water systems; HSE ACOP L8
Holiday closures and reoccupation
- •School holidays are the highest-risk period for water systems, because outlets sit unused and water stagnates - and the summer break can be six weeks or more.
- •A flushing regime should keep outlets turned over during extended closures where reasonably practicable, and a documented pre-reoccupation flush should be completed before staff and pupils return.
- •Plan for who carries out holiday and pre-reoccupation flushing when site staff are on leave, and record it - this is one of the most common places monitoring quietly lapses.
- •HSE guidance (HSG274 Part 2) describes pre-reoccupation procedures after a period of low use; the written scheme should translate these into a task the school actually does before day one of term.
When a result is out of range
- •Recording an out-of-range reading is not the end of the task - it is a trigger for action. A hot outlet below temperature or a cold outlet above 20°C should be investigated and corrected, and the follow-up recorded.
- •Typical corrective actions include checking and adjusting calorifier or TMV settings, identifying and removing dead legs, increasing flushing frequency for a problem outlet, or escalating to the water hygiene contractor.
- •The written scheme should state the parameters and the action to take when they are not met, so site staff know when to act and when to escalate rather than simply logging a number.
- •Repeated or unresolved out-of-range results are a signal to review the controls - and potentially the risk assessment - not just to keep recording them.
Who carries out the monitoring?
- •Routine checks - monthly temperatures and weekly flushing - can be carried out by trained site staff. They do not need a specialist qualification, but they must understand the target temperatures, how to take a reading correctly, and when to escalate.
- •The water hygiene contractor typically handles quarterly and annual monitoring, tank and system cleaning, TMV servicing, and remedial work, and often reviews the written scheme.
- •The appointed responsible person (see the legionella guide) oversees that the monitoring happens on schedule, results are recorded, and exceptions are acted on.
- •The duty holder - the trust - remains accountable for ensuring the monitoring is actually being done and evidenced, not simply assigned.
Sources: HSE ACOP L8
Records to keep, and common gaps
- •Records to keep: monthly sentinel temperature logs (date, outlet, temperature, who took the reading); weekly flushing logs showing which outlets and when; quarterly and annual contractor reports; corrective-action records for out-of-range results; and tank, TMV, and showerhead cleaning and servicing records.
- •Common gap - holiday months missing entirely from the logs, because checks were not covered while site staff were on leave.
- •Common gap - out-of-range readings recorded but never investigated: a cold tap at 22°C noted in the log with no follow-up.
- •Common gap - the written scheme not updated after the water system changed (new buildings, decommissioned outlets, added TMVs), so the monitoring no longer matches the system.
- •Common gap - records kept only on paper in plant rooms or site offices, hard to audit, easy to lose, and invisible to central estates teams across a trust.
Practical next steps
- •Check the monitoring schedule matches the current written scheme of control and the water system as it is today, not as it was at the last assessment.
- •Close the holiday gap: assign and record holiday flushing and a pre-reoccupation flush before each term starts.
- •Make out-of-range results trigger a recorded action, not just a logged number - agree the escalation route with the contractor.
- •Move monitoring off loose paper into a form that a central team can see, so missing months and unresolved exceptions surface early.
- •Keep the monitoring evidence linked to the risk assessment and written scheme so the full legionella picture is available in one place.
Frequently asked questions
- What is water hygiene monitoring in a school?
- It is the ongoing operational routine that keeps a school's legionella risk under control - chiefly monthly sentinel temperature checks, weekly flushing of low-use outlets, quarterly and annual contractor monitoring, and the records that evidence it. It implements the controls set out in the legionella risk assessment and written scheme of control.
- What temperatures should school water systems reach?
- As a typical target following HSE guidance, hot water should reach 50°C or above within one minute at the outlet, cold water should stay below 20°C, and stored hot water in the calorifier should be held at around 60°C. The exact parameters for a given school come from its written scheme of control.
- How often should low-use outlets be flushed?
- Weekly flushing of infrequently used outlets is the usual pattern, running each outlet long enough to replace the standing water. Flushing matters most during and after holidays, when outlets sit unused; a documented pre-reoccupation flush should be completed before the school reopens.
- Who can carry out water temperature checks in a school?
- Routine monthly temperature checks and weekly flushing can be done by trained site staff - no specialist qualification is required, but they must understand the target temperatures, how to take a reading correctly, and when to escalate. Quarterly and annual monitoring, cleaning, and TMV servicing are usually carried out by the water hygiene contractor.
- What should happen when a temperature reading is out of range?
- An out-of-range reading is a trigger for action, not just a number to log. It should be investigated and corrected - for example by checking calorifier or TMV settings, removing dead legs, or increasing flushing - and the follow-up recorded. Repeated or unresolved results should prompt a review of the controls and possibly the risk assessment.
- Do we need both a legionella risk assessment and water hygiene monitoring?
- Yes. The risk assessment identifies the hazards and decides the controls; monitoring implements and evidences those controls day to day. A risk assessment with no monitoring, or monitoring with no current assessment, is a compliance gap. See the legionella risk assessment guide for the duty and the written scheme.
How EduComply helps manage this at scale
Recommended operational practice for managing this across a trust - not a statutory requirement in itself.
- •Water hygiene monitoring reports from contractors are forwarded by email or uploaded. EduComply extracts the key findings and updates each school's compliance record.
- •Recurring monitoring - temperature checks, flushing, TMV servicing - can be tracked as scheduled checks with completion records and photos, so missed months are visible rather than assumed done.
- •A trust-wide view shows which schools have current monitoring, which are approaching their next contractor visit, and which have gaps in their records.
- •Out-of-range findings and remedial recommendations become actions with owners and deadlines, so they are investigated and closed rather than logged and forgotten.
- •Alerts prompt estates teams before contractor visits are due, and all evidence - risk assessment, written scheme, monitoring logs, cleaning records - is linked together against each school.
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Sources and guidance
The references below distinguish what the law requires from official guidance, recognised technical standards, and EduComply’s recommended operational practice. Always work from the current version of a source.
- Legislation· Legal requirement
- Approved Code of Practice· Statutory code with special legal standing
- Official guidance· Regulator / government guidance
UK Statutory Instrument 2002 No. 2677
- Approved Code of PracticeLegionnaires’ disease: The control of legionella bacteria in water systems (L8)
Health and Safety Executive: Approved Code of Practice and guidance
- Official guidanceLegionnaires’ disease: Technical guidance (HSG274)
Health and Safety Executive · Part 2: hot and cold water systems
- Official guidanceGood estate management for schools (GEMS)
Department for Education · Health and safety / statutory compliance duties
This guide is general information for UK schools and multi-academy trusts, not legal advice. Requirements vary by building, duty holder, and circumstances. Refer to the current source material and seek professional advice where needed.
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