Legionella in care homes
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Key points
- A risk assessment is a legal must. A care home needs a current legionella risk assessment, and the CQC expects to see one as part of safe, well-led care.
- Residents are a high-risk group. Older age, smoking history, and weakened immune or respiratory health all raise the chance of Legionnaires' disease.
- The building works against you. Large, complex pipework, dead legs, and vacant rooms let water stagnate, and showers and assisted baths create breathable aerosol.
- Two safety duties collide. Water must stay hot for control yet reach frail residents safe to touch, which is why thermostatic mixing valves matter.
- Records decide inspections. Weekly flushing of void outlets, temperature monitoring, and a named responsible person, all written down, are what an inspector and a court look for.
Care homes sit at the sharp end of legionella control. They house the people most likely to fall seriously ill from Legionnaires' disease, and they run water systems that are among the harder ones to keep safe. That combination is why regulators treat water safety in a care home as a core part of good care, not a background maintenance job.
This page sets out why residents are so vulnerable, why care-home water systems carry extra risk, what the law and the CQC actually require, and the practical control regime that keeps a home compliant. It ends with the case every provider should know about.
Why care-home residents are a high-risk group
Legionnaires' disease is a form of pneumonia caught by breathing in fine water droplets that contain legionella bacteria. Most healthy adults who are exposed never become ill. The people who do, and who are most likely to die, share a set of characteristics that describe a large part of any care-home population.
- Older age. Susceptibility rises steadily with age, and most confirmed cases are in people over 50.
- A smoking history. Current and former smokers have more vulnerable lungs.
- Weakened immunity. Many residents take medication or have conditions that suppress the immune response.
- Existing respiratory disease. Chronic lung conditions make infection more likely to take hold and harder to survive.
A care home concentrates all of these factors in one place. When the same building also generates breathable aerosol through showers and assisted or hydrotherapy baths, the route of infection and the vulnerable host meet. That is the reason care homes are held to a high standard of control.
Why care-home water systems carry extra risk
The people are only half of it. The plumbing in a typical care home is exactly the kind that legionella prefers. Systems tend to be large and complex, with long runs of pipework serving many rooms, which means more places for water to sit and cool into the growth range of roughly 20°C to 45°C.
Several features stand out. Dead legs, sections of pipe that no longer feed a live outlet, hold warm water that never moves. Rooms fall vacant when a resident leaves or is admitted to hospital, so their basin, shower, and toilet outlets can go unused for days or weeks and stagnate. Assisted baths, spa or hydrotherapy pools, and showers all throw off the fine aerosol that carries bacteria into the lungs. Each of these is manageable, but only if it is identified and actively controlled.
The legal position
A legionella risk assessment is a legal requirement, not a recommendation. The duty flows from the Health and Safety at Work etc. Act 1974 and the Control of Substances Hazardous to Health Regulations, and the way to discharge it is described in the HSE approved code of practice, ACOP L8, supported by the technical guidance in HSG274. A duty holder must assess the risk, put a written scheme of control in place, and keep it under review.
On top of health and safety law, the CQC regulates care homes and treats water safety as part of safe, well-led care. So a care home actually carries two overlapping obligations that point to the same evidence: the HSE expects the assessment and controls because it is a workplace, and the CQC expects them because it is a regulated care setting. There is no version of a compliant care home that does not have a current risk assessment.
What the CQC expects to see
CQC inspectors do not test water themselves, but they look for the documented evidence that risk is being managed. In practice that means a current risk assessment, a written control scheme, a named responsible person, and monitoring records that show the scheme is being carried out rather than sitting in a folder. Water safety maps onto the safe and well-led key questions, so gaps here can pull down a home's rating.
The failures inspectors most often flag are an assessment that has gone out of date, one that was never acted on, or records that stop part way through the year. An assessment that is recent, implemented, and backed by consistent logs is the picture of a home that has this under control.
The control regime for a care home
The scheme itself is standard legionella control, applied with extra discipline because of the residents. Temperature control is the backbone: hot water stored at 60°C and delivered at 50°C (55°C in healthcare) within one minute, cold water kept below 20°C. Because those hot temperatures would scald frail skin, outlets used by residents are fitted with thermostatic mixing valves that blend the water down to a safe delivery temperature at the tap while the system behind stays hot. This is the scalding-versus-legionella tension, and the valve is how a care home resolves it.
Around that sit the routine tasks: weekly flushing of little-used and void-room outlets, regular temperature monitoring, servicing of mixing valves, inspection of tanks and calorifiers, and cleaning of shower heads. Every task needs an owner and a written record. The table below shows a typical schedule, though the risk assessment sets the exact frequencies for your building.
| Control task | Typical frequency |
|---|---|
| Flush little-used and void-room outlets | Weekly |
| Check hot and cold temperatures at sentinel outlets | Monthly |
| Descale and disinfect shower heads and hoses | Quarterly |
| Service and check thermostatic mixing valves | Six to twelve months |
| Inspect cold water storage tanks | Annually |
| Inspect and clean calorifiers | Annually |
| Review the risk assessment | Every two years, or on any change |
Two of these deserve extra attention in a care home. Weekly flushing of vacant-room outlets is the single control that most often lapses when a home is busy, yet stagnant water in an empty room is a classic source. And a documented monitoring schedule with a named person against each task is what turns a good intention into evidence.
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.
What an inspection or a prosecution turns on
When something goes wrong, the question is always the same: was there a scheme, and was it actually followed? The care-home case in our enforcement tracker shows what a failure looks like. An 86-year-old resident died of Legionnaires' disease at a Brentwood care home in 2015, months after a refurbishment. The company had failed to flush and disinfect the system, the manager lacked the training to run the controls, warnings were ignored, and records were falsified. The operator was fined £3m, later reduced to £1.5m by the Court of Appeal, under section 3 of the Health and Safety at Work Act.
Read that list of failings back against the control regime above and the lesson is plain. Each failure, no flushing, an untrained manager, ignored warnings, false records, maps onto a routine control that should have been in place and evidenced. A prosecution rarely turns on bad luck. It turns on missing controls and missing paperwork.
Getting it right in your home
The practical route to compliance is to name a responsible person, commission or refresh the risk assessment, and then run the schedule so that every check leaves a record. Temperature monitoring and mixing-valve servicing keep the water both safe from legionella and safe to touch; weekly flushing keeps unused outlets from becoming the weak point. None of this is exotic, and it is well within reach of a well-run home working from a clear risk assessment template.
Done consistently, the same records satisfy the HSE, satisfy the CQC, and, in the worst case, show a court that the home took its duty to vulnerable residents seriously. That is the whole point of the paperwork: it is the proof that the people in your care were protected.
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
Is a legionella risk assessment mandatory for care homes?
Yes. A suitable and sufficient legionella risk assessment is a legal requirement for a care home, the same as for any workplace with a water system. The duty comes from the Health and Safety at Work etc. Act 1974 and the Control of Substances Hazardous to Health Regulations, with the detail set out in the HSE approved code of practice ACOP L8. Because the CQC treats water safety as part of safe, well-led care, an inspector will also expect to see the assessment, so in practice it is both a health and safety obligation and a registration one.
Who is responsible for legionella in a care home?
Legal responsibility sits with the duty holder, usually the registered provider or the company that operates the home, and cannot be delegated away. In practice the provider appoints a named responsible person to manage the day-to-day control scheme: overseeing monitoring, keeping records, and arranging remedial work. The registered manager is normally accountable for making sure the tasks actually happen on site. Everyone in the chain needs enough training to do their part, and a gap here, an untrained manager, was a feature of the Bupa prosecution.
How often should a care home do legionella checks?
It depends on the task. Hot and cold water temperatures at sentinel outlets are typically checked monthly. Little-used or void-room outlets should be flushed weekly to stop water stagnating. Thermostatic mixing valves are usually serviced every six to twelve months, cold water storage tanks inspected annually, and calorifiers drained and inspected annually. Shower heads and hoses are commonly descaled and disinfected quarterly. The risk assessment sets the exact schedule for your building, and every check should be written down.
What does the CQC require for legionella?
The CQC expects a care home to have a current legionella risk assessment, a written control scheme, a named responsible person, and up-to-date monitoring records that show the controls are actually being carried out. Water safety falls under the safe and well-led key questions, so inspectors look for evidence that risks to vulnerable residents are identified and managed, not just paperwork on a shelf. Missing, out-of-date, or unimplemented assessments are a common finding and can affect a home's rating.
Why are care-home residents a high-risk group for Legionnaires' disease?
Legionnaires' disease is a serious lung infection, and the people most likely to develop it and to become seriously ill are older adults, smokers or ex-smokers, and anyone whose immune system or lungs are already compromised. Care homes concentrate exactly this population under one roof. Add water systems that produce breathable aerosol, such as showers and any hydrotherapy or assisted baths, and you have a vulnerable group exposed to the main route of infection, which is why control in care homes is held to a high standard.
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