RUH Bath: the hospital water loop nobody checked for six years
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Key points
- £300,000 fine plus £37,451.78 costs for Royal United Hospitals Bath NHS Foundation Trust in 2018, after a cancer patient died in 2015 following exposure to legionella in a ward annex.
- A separate water loop feeding the annex, opened in 2009, had never been temperature-checked or tested in six years of operation.
- The strain was not matched to the system, so the charge was exposing patients to risk — proof that the illness need not be traceable for a prosecution to stand.
- The case shows how building changes orphan parts of a water system from the monitoring regime, and why every alteration is a risk-assessment trigger.
- Charge: HSWA 1974 section 3(1), prosecuted by the HSE in the South West.
Royal United Hospitals Bath NHS Foundation Trust was fined £300,000 in 2018 after a cancer patient died following exposure to legionella in a hospital ward annex. The annex was fed by a separate water loop, opened in 2009, that had never once been temperature-checked or tested.
The case is a lesson in how water systems change silently under a hospital’s feet, and it is recorded in our legionella enforcement tracker.
What happened
In 2015, a cancer patient at the Royal United Hospitals Bath died after being exposed to legionella in a ward annex. The annex was not part of the original hospital: it was served by a separate water loop that had been opened in 2009, six years earlier.
In those six years, that loop had never been temperature-checked and never tested. The hospital’s monitoring regime — whatever it covered — did not cover the annex. So a water system serving some of the most vulnerable patients any building holds, people whose immune systems were suppressed by illness and treatment, ran unmonitored for its entire life.
Laboratory work could not match the legionella strain between the patient and the water system. That meant the prosecution could not charge the Trust with causing the death. It did not need to. The charge under section 3(1) of the Health and Safety at Work etc. Act 1974 was exposing patients to the risk, and on that charge the Trust pleaded guilty in 2018. It was fined £300,000 with £37,451.78 in costs.
The failings the inspectors found
At the centre of the case is a single, structural failure with a long fuse:
- A water loop outside the monitoring regime. When the annex opened in 2009, its outlets were never added to the temperature and testing schedules. The oversight was not a missed check; it was a whole section of system that the regime had never heard of. Healthcare water systems are supposed to be managed under HTM 04-01, which expects exactly this kind of change to be captured by the water safety group.
- Six years of undetected drift. Because nothing was measured, nothing could be corrected. Temperature control only works where temperatures are actually taken: hot water at 55°C or above at outlets in healthcare, cold below 20°C.
- Vulnerable patients on an unmanaged supply. The combination the courts weigh most heavily — foreseeable harm to people least able to survive it — was present in full.
Other NHS trusts in the enforcement record failed in noisier ways — hundreds of ignored positive tests in one case. Bath failed quietly: nothing was found wrong because nothing was looked at.
The fine and costs
| Fine | £300,000 |
|---|---|
| Costs | £37,451.78 |
| Charge | Health and Safety at Work etc. Act 1974, section 3(1) |
| Prosecutor | Health and Safety Executive |
| Illness or death | One death in 2015; strain not matched, so charged as exposure to risk |
The “strain not matched” detail deserves attention from every duty holder, not just hospitals. It shows the court needed no epidemiological proof of causation to convict. The unmanaged loop was the offence; the death was the context that raised the penalty.
The lesson for duty holders
For hospitals and healthcare premises, and for any large building that grows by extension, the lessons are:
- Every building change is a water-system change. New wings, refurbished floors, converted rooms: each one alters pipework, and each alteration must land in the risk assessment and the monitoring schedule. Our guide on when to review a risk assessment lists the trigger events.
- Map the system you actually have. A monitoring regime built on an old schematic will miss whatever has been added since. Walk the system, find every loop and outlet, and check the schedule covers all of them — including any dead legs the works created.
- Unmonitored means unmanaged. In law, a section of system with no checks is not an unknown; it is a breach. You cannot plead that nothing bad was measured when nothing was measured.
- Exposure is chargeable. Do not take comfort from the difficulty of proving where an infection came from. Section 3 does not require it.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
For six years a hospital annex ran on water nobody ever checked. The strain was never matched, the death could not be pinned to the pipework — and the Trust was still convicted, because the law punishes the exposed risk, not just the proven harm.
The organisational fix in healthcare is the water safety plan and water safety group that HTM 04-01 expects, sitting above the routine monitoring. For any duty holder mapping a changed system, the risk assessment builder is an indicative starting point; it records and organises what you find, and it never certifies a system as safe.
Source: Local Government Lawyer report on the RUH Bath fine. Figures are recorded as published in our legionella enforcement tracker dataset; check the linked source before relying on any figure.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Frequently asked questions
Why was Royal United Hospitals Bath fined £300,000?
A cancer patient died in 2015 after being exposed to legionella in a ward annex at the Royal United Hospitals Bath. A separate water loop feeding the annex, opened in 2009, had never been temperature-checked or tested. The bacterial strain was not matched to the system, so the charge was exposing patients to risk rather than causing the death. The Trust pleaded guilty to breaching section 3(1) of the Health and Safety at Work etc. Act 1974 and was fined £300,000 plus £37,451.78 costs in 2018.
Do hospital water systems have to be checked even in new extensions?
Yes, and new extensions are a particular blind spot. A new wing or annex is often fed by a new or altered section of pipework that the existing monitoring regime was never designed to cover. Until the outlets on that loop are added to the temperature and flushing schedules, they are unmonitored by default. At Royal United Hospitals Bath, the annex loop opened in 2009 and had never been checked by the time a patient was exposed in 2015. Any change to a water system should trigger a review of the risk assessment and the monitoring points.
Can an NHS trust be prosecuted without proving the water caused the death?
Yes. HSWA section 3(1) criminalises exposing people to risk, not only causing proven harm. At Bath, the legionella strain was not matched between the patient and the water system, so the prosecution proceeded on the exposure: a cancer ward annex whose water had never been monitored was a risk to patients whether or not that specific infection could be traced to it. Exposure prosecutions are common across the healthcare cases in the enforcement record.
What water temperatures should a hospital maintain?
Healthcare guidance expects hot water stored at 60°C or above and reaching at least 55°C at outlets within a minute — 5°C higher than the 50°C general standard — with cold water below 20°C within two minutes of running. HTM 04-01 adds the organisational layer for healthcare: a water safety group, a water safety plan, and augmented surveillance for high-risk patient areas. Thermostatic mixing valves manage the scald risk at outlets but need their own servicing schedule.
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