Water hygiene is an important consideration in any building, but in care homes, the stakes can be particularly high. Residents may be older, frailer, or living with health conditions that make them more vulnerable to the consequences of poorly managed water systems. CQC says a Legionella risk assessment is a legal requirement and highlights this under Regulation 12: Safe care and treatment and Regulation 15: Premises and equipment.
That means water hygiene in care homes is not simply a box-ticking exercise. It is part of maintaining a safe environment, managing foreseeable risk, and making sure systems and control measures continue to reflect how the building is actually being used. HSE's current guidance places clear emphasis on identifying and assessing risk, appointing a competent responsible person, implementing a control scheme, and reviewing control measures.
Why Water Hygiene Matters So Much in Care Homes
Care homes are different from many other premises because they support people who may be especially susceptible to illness. CQC explicitly notes that Legionnaire's disease is particularly dangerous for elderly people and those with weakened immune systems.
There can also be a balance to manage between reducing legionella risk and controlling scalding risk. HSE's hot and cold water guidance specifically flags scalding as an important consideration in healthcare-type environments and notes that temperature control is a key strategy for reducing Legionella risk in domestic hot and cold water systems.
In practice, this means care homes need more than a one-off assessment. They need consistent day-to-day oversight of water systems, clear responsibilities, and control measures that continue to work in the real building, with real residents, staff routines, and patterns of use.
Key Water Hygiene Risks in Care Homes
The exact risks will vary from one home to another, but some themes come up again and again.
1. Low use and stagnation
Bedrooms may be empty for periods of time, some bathrooms may be used less often than others, and parts of a building may fall out of regular use without formal arrangements being updated. HSE notes that Legionella can grow in water systems between 20 °C and 45 °C, especially where there is a risk of stagnation.
That makes it important to identify little-used outlets, review whether flushing is needed, and make sure control measures still reflect actual use of the building.
2. Poor hot and cold water temperature control
Temperature control remains one of the key ways to reduce the risk of Legionella in hot and cold water systems. As a general guide, cold water should be maintained below 20°C where possible, while hot water should be stored at 60°C or above and distributed so that it reaches 55°C within 1 minute in healthcare premises such as care homes.
In care homes, this must also be balanced against scalding risk. That is why thermostatic control at the point of use can form an important part of the overall strategy where vulnerable residents are involved. HSE specifically notes that where vulnerable people have access to baths or showers and scalding risk is significant, a Type 3 TMV should be fitted to prevent water being discharged above 44°C.
Where temperatures are not being achieved consistently, that may point to broader issues with the system, monitoring, insulation, turnover, or asset condition.
3. Outlet condition and maintenance
Showers, taps, and other outlets need ongoing attention. Scale, corrosion, debris, poor cleanliness, or limited maintenance can all indicate that wider control measures may not be as effective as they should be.
4. Inadequate oversight of system changes
Care homes are not static environments. Rooms change use, fixtures are replaced, layouts evolve, and staff responsibilities can shift. A water hygiene document that once reflected the site well can gradually become outdated if it is not reviewed properly.
5. Unclear responsibilities and weak follow-through
A home may have a risk assessment and written documents on file, but still struggle in practice if no one is clearly overseeing actions, reviews, records and escalation. HSE's L8 gives ACOP status to the appointed competent person, control scheme, and review of control measures, underlining the importance of active management rather than passive paperwork.
Who is Responsible for Water Hygiene in a Care Home?
Responsibility needs to be clear. HSE's L8 highlights the specific role of an appointed competent person, often referred to as the responsible person, along with the need for a control scheme and review of control measures.
In a care home setting, this means someone should be clearly responsible for making sure that:
This does not necessarily mean one person does every task themselves, but it does mean ownership should be defined rather than assumed.
If you want a broader overview of legal duties, check out our blog regarding Legionella risk assessments and who needs one.
Important Control Measures for Care Home Water Systems
The right control measures will depend on the system and the findings of the risk assessment, but common areas of focus include:
A suitable Legionella risk assessment
CQC is explicit that a Legionella risk assessment is a legal requirement.
That assessment should help identify where risk exists, what control measures are needed, and whether current arrangements remain suitable.
Temperature control
Cold water should be maintained below 20°C, while hot water should be stored at 60°C or above and distributed so that it reaches 55°C within 1 minute in healthcare premises such as care homes.
Managing low-use outlets
Where outlets are not used regularly, a regular flushing regime should be in place. Weekly flushing is often used as the baseline, but in higher-risk settings such as care environments the risk assessment may determine that more frequent flushing is needed.
Monitoring and review
HSE says dutyholders should monitor control measures applied to the system.
Monitoring is only useful if the results are reviewed and acted on where needed.
Outlets and asset condition
Showers, TMVs, cold water storage tanks, hot water storage heaters and other assets should be in a suitable condition and accessible for inspection, servicing and maintenance.
Appropriate sampling where indicated
HSE's testing and monitoring guidance explains when and how to test water systems for legionella and what to consider when asking someone else to do this on your behalf.
Why Monitoring, Review and Record Keeping Matter
Good water hygiene management is not just about carrying out tasks. It is also about being able to show what was done, when it was done, what the results were, and what happened next if a problem was identified.
Records matter because they help demonstrate that control measures are active rather than assumed. They also make it much easier to spot trends, follow up overdue actions, and identify when arrangements no longer match the site.
CQC's wider expectations around safe care, infection prevention and control, and premises and equipment all reinforce the need for providers to identify, evaluate and manage environmental risks in a structured way.
When Should a Care Home Review Its Water Hygiene Arrangements?
A review may be needed when:
HSE's current ACOP and guidance place clear emphasis on the review of control measures, not just putting them in place once.
Final Thoughts
Care home water hygiene is about more than having a document on file. It is about making sure risks are understood, responsibilities are clear, and control measures continue to reflect the actual building and the people living in it.
In settings where residents may be more vulnerable, ongoing oversight matters. A suitable risk assessment, clear ownership, practical control measures, and regular review all play an important part in keeping water systems properly managed. CQC treats Legionella risk assessment as legal evidence of safe care and suitable premises, while HSE's guidance continues to centre on risk assessment, the responsible person, the control scheme and review.
If you need support reviewing water hygiene arrangements in a care home, BrodexTrident can help assess current risks, control measures and next steps.