Of all the settings in which Legionella bacteria can cause harm, care homes present perhaps the most serious risk. The residents of care homes – elderly individuals, many of whom live with chronic illness, impaired immunity, or respiratory conditions – are among the groups most vulnerable to severe or fatal Legionnaires’ disease. A Legionella outbreak in a care home can have devastating consequences.
For care home operators, Legionella control is not simply a matter of health and safety law. It sits at the intersection of health and safety legislation, Care Quality Commission (CQC) regulatory requirements, clinical governance obligations, and a fundamental duty of care to residents. This guide explains the specific risks, requirements and best practice for Legionella management in residential care settings.
Why Care Homes Face a Heightened Legionella Risk
Vulnerable Residents
The residents of care homes are, by definition, a high-risk population for Legionnaires’ disease. Age is one of the most significant risk factors – the vast majority of Legionnaires’ disease fatalities occur in people over 50, and the risk increases with age, making elderly people especially vulnerable to this severe form of pneumonia. Many care home residents also live with chronic respiratory conditions, diabetes, kidney disease, cancer, or immunosuppressive conditions or medications – all of which significantly elevate the risk of severe illness or death if Legionella bacteria multiply dangerously in man-made plumbing systems and infection occurs, with the most serious cases leading to respiratory failure, septic shock, or multi-organ failure.
Complex Water Systems
Care homes typically have extensive hot and cold water systems serving a large number of outlets – resident bathrooms, wet rooms, assisted baths, kitchen and catering facilities, laundry, and staff welfare areas. These man-made plumbing networks can contain stagnation points where stagnant water increases risk. Many care homes occupy converted or extended older buildings with complex, uneven pipework networks, and thermostatic mixing valves fitted throughout to prevent scalding. Proper management of hot and cold water, including cold water systems, is essential for controlling legionella.
Continuous Occupancy
Unlike commercial offices or hotels, care homes are continuously occupied – 24 hours a day, 365 days a year – with residents who cannot be temporarily relocated during water system maintenance or disinfection. This places significant operational constraints on the timing and nature of remedial work and requires careful planning and coordination. Residents also remain at risk of contracting legionnaires disease through inhaling aerosols from common water systems such as showers and air conditioning, especially where rooms or outlets are not used regularly.
The Legal and Regulatory Framework for Care Homes
Health and Safety Legislation and ACoP L8
Care homes are subject to the same health and safety legislation as all other business premises: the Health and Safety at Work etc. Act 1974, COSHH 2002, and the Management of Health and Safety at Work Regulations 1999. The health and safety executive’s ACoP L8 applies in full, requiring a current Legionella risk assessment, a written Water Safety Plan, a nominated Responsible Person, and a comprehensive monitoring and record-keeping programme. It applies to duty holders with a foreseeable risk of exposure, and appointing a competent person is a legal requirement.
Care Quality Commission (CQC) Regulation 12
CQC Regulation 12 – Safe Care and Treatment – requires registered care providers to assess the risk of, and prevent, detect and control the spread of infections. This explicitly includes Legionella. CQC inspectors assess Legionella compliance as part of routine inspections, and inadequate water safety management can result in requirement notices, warning notices, and ultimately enforcement action including suspension or cancellation of registration, as well as fines and legal claims where poor control contributes to illness.
CQC’s Key Lines of Enquiry (KLOEs) for safe care include specific questions about water safety: inspectors will ask to see the current risk assessment, the Water Safety Plan, monitoring records, and evidence that the Responsible Person is appropriately trained. Gaps in any of these areas are likely to result in a regulatory finding, which underlines the importance of staying compliant.
NHS England HTM 04-01
For care homes that have NHS contracts or that treat NHS-funded residents, NHS England’s Health Technical Memorandum HTM 04-01 (Safe Water in Healthcare Premises) provides additional sector-specific guidance. Whilst HTM 04-01 is primarily aimed at acute NHS trusts, its principles and many of its specific recommendations are widely applied to care home settings – particularly in relation to the requirements for a Water Safety Group, annual review of the Water Safety Plan, and enhanced monitoring in high-risk areas, and most care homes use HTM 04-01 principles as supplementary guidance where resident vulnerability or service complexity justifies it.
Key Legionella Risks in Care Home Water Systems
| Risk Factor | Specific Care Home Context |
| Thermostatic mixing valves (TMVs) | Fitted to all resident bathrooms to prevent scalding. Downstream pipework operates at risk temperatures. Requires regular servicing and flow testing. |
| Assisted baths and wet room showers | High-risk aerosol-generating equipment used daily by vulnerable residents. Temperature monitoring and regular cleaning critical. |
| Infrequently used outlets | Rooms temporarily vacant due to resident absence, hospitalisation or death. Outlets must be flushed regularly and records maintained. |
| Cold water storage tanks | Often older, larger tanks with poor turnover and insulation. Must be inspected annually and maintained below 20°C. |
| Catering and laundry facilities | High-volume hot water users – calorifier demand and temperature consistency must be monitored carefully. |
| Ice machines and drinking water dispensers | Sometimes overlooked as Legionella risk points. Must be included in the risk assessment and maintenance schedule. |
Legionella Monitoring Requirements for Care Homes
Temperature Monitoring
Care homes should implement a monthly temperature monitoring programme at all sentinel outlets (the first and last outlets on each flow and return circuit), with quarterly monitoring at all remaining outlets; this should include regular monitoring and explicit temperature checks. Warm water between 20-45°C can support viable legionella bacteria, so temperature control is critical. Given the vulnerability of the resident population, many water hygiene specialists recommend more frequent monitoring – particularly for assisted baths, wet room showers, and any outlets serving residents with the highest clinical risk.
All temperature results must be recorded and reviewed by the Responsible Person. Any outlet returning a temperature outside the required range must be investigated and documented, with the cause identified and remediated before the outlet is returned to normal use; hot water should be stored at 60°C or higher, cold water kept below 20°C, and infrequently used outlets flushed regularly alongside cleaning showerheads and taps.
TMV Servicing and Testing
Thermostatic mixing valves in care homes must be serviced and flow-tested at least annually – and more frequently where the risk assessment indicates, as poor maintenance can increase scalding risk for residents with reduced mobility. Servicing should include: verification that the hot supply temperature upstream of the TMV is at or above 50°C; flow testing to confirm the valve is delivering within the required temperature range; and inspection and cleaning of the cartridge. All TMV service records must be maintained.
Legionella Sampling
Quarterly Legionella sampling and legionella testing is recommended as a minimum for care home water systems, with monthly sampling in higher-risk areas – particularly where residents are immunocompromised or have advanced respiratory disease. Testing helps identify conditions linked to legionella outbreaks, especially where water is stagnant and temperatures sit between 20-45°C. Sampling should be carried out in accordance with BS 7592:2022 and analysed by a UKAS-accredited laboratory. Any positive result must be responded to promptly and documented fully.
Showerhead Cleaning and Descaling
Showerheads in care homes should be removed, descaled and disinfected at least quarterly – and monthly in higher-risk areas. Scale and biofilm accumulation in showerheads is a significant Legionella risk that is frequently underestimated. Showerhead cleaning records must be maintained as part of the overall water hygiene compliance record.
Infrequently Used Outlet Flushing
Outlets in rooms that are temporarily vacant require routine flushing at least weekly for infrequently used taps and showerheads to prevent water stagnation that supports bacteria growth. This weekly flushing is one of the key control measures to reduce stagnation and support safe water hygiene management, which is particularly important when a resident’s room is vacant following hospitalisation or bereavement – periods that may last several weeks. Flushing records must be maintained by care staff or maintenance personnel and should specify the date, the outlet flushed, and the name of the person who carried out the task.
The Responsible Person in a Care Home Context
In a care home, the Responsible Person is typically the registered manager, a senior member of the facilities or maintenance team, or a qualified safety executive appointed to manage the water hygiene programme. Whoever is appointed, they must:
- Have completed accredited Legionella Responsible Person Training (City & Guilds Level 3) or equivalent legionella training
- Have the authority to instruct remedial works and to restrict the use of outlets where necessary
- Have access to up-to-date Water Safety Plan, risk assessment, and all monitoring records
- Oversee the scheme of control, including regular temperature monitoring, cleaning and disinfection routines, maintenance, and other control measures needed to prevent Legionella growth
- Ensure care home staff understand their day-to-day responsibilities
- Receive regular refresher training (recommended every three years)
Given the regulatory scrutiny that care homes face, many operators choose to contract water hygiene management to a specialist company, but the care home must still carry overall oversight internally rather than relying entirely on external support. This approach is legitimate and can be highly effective, provided the duty holder can carry out informed review of the service and the records are maintained internally. Compliance records should be retained for at least five years.
Frequently Asked Questions
Q: Is Legionella a CQC compliance issue for care homes?
Yes. CQC Regulation 12 (Safe Care and Treatment) requires registered care providers to assess and control the risk of infection, which explicitly includes Legionella. During inspections, CQC assessors will ask to see the Legionella risk assessment, Water Safety Plan, monitoring records, and evidence of Responsible Person training. Inadequate water safety management is likely to result in a regulatory requirement or warning notice.
Q: How often should care homes test for Legionella?
As a minimum, quarterly Legionella sampling is recommended for care home water systems. For higher-risk areas – particularly where residents are immunocompromised, on ventilators, or have advanced respiratory disease – monthly sampling may be appropriate. The specific sampling frequency should be determined by the Legionella risk assessment and documented in the Water Safety Plan.
Q: What temperature should hot water be in a care home?
Hot water should be stored at 60°C or above and distributed at 50°C or above throughout the system, reaching 50°C at sentinel outlets within one minute. At resident outlets, thermostatic mixing valves should be set to deliver water at a safe temperature (typically 41–43°C for assisted baths and 38-41°C for showers) to prevent scalding – but the hot supply to each TMV must still be at 50°C or above.
Q: What should a care home do if a resident’s room is vacant?
Any outlet in a vacant resident room must be flushed at least weekly to prevent water stagnation and Legionella growth. Flushing should be carried out by a trained member of staff, with the date, outlet location and name of the person flushing recorded in the monitoring log. If the vacancy is extended, the Responsible Person should review whether any additional measures are required.
Q: Can a care home manage its own Legionella compliance internally?
Yes, provided the care home has a competent person in place, appropriate legionella training for relevant staff, and the resources to implement and maintain the full monitoring programme. Many care homes choose to contract technical monitoring and sampling to a specialist water hygiene company while retaining internal oversight – a hybrid approach that combines external technical expertise with internal accountability.
How Marlowe Environmental Services Can Help
Marlowe Environmental Services has extensive experience supporting care homes of all sizes with Legionella risk assessment, Water Safety Plan development, monitoring programmes, and Responsible Person training. Our UKAS-accredited assessors understand the specific challenges of the care home environment – from continuous occupancy constraints to CQC compliance requirements – and can design a water hygiene programme that is both clinically appropriate and operationally practical.
Contact us today to discuss your care home Legionella compliance requirements. Call 01454 299 310 or email hello@marlowe-es.com