A dental legionella risk assessment is not just a generic water hygiene check. Dental practices have specific risks, responsibilities and compliance requirements because of the way water is used in surgeries, dental unit waterlines, reverse osmosis systems, decontamination rooms and aerosol-generating procedures.
For a busy dental practice, the aim is simple: keep patients, staff and visitors safe, meet your legal and regulatory duties, and have clear records that show your water systems are being properly managed.
DWS provides specialist legionella risk assessments for dental practices, helping practice owners and managers understand their risks, improve their records and maintain a practical control scheme that works in the real world.
Why dental practices need a specialist legionella risk assessment
All workplaces with water systems need to consider the risk of Legionella. However, dental practices are not the same as ordinary offices, shops or commercial premises.
Dental environments often include:
- Dental unit waterlines, also known as DUWLs
- Aerosol-generating procedures
- High-speed handpieces and ultrasonic scalers
- Reverse osmosis water systems
- Autoclaves and decontamination equipment
- Stored hot water systems
- Multiple surgeries with regular patient use
- Detailed infection prevention and control requirements
- Practice logbooks and compliance records
These systems create a more specialist risk profile. A dental legionella risk assessment needs to consider both the domestic hot and cold water systems and the dental-specific water systems used during clinical work.
A standard commercial assessment may not go far enough.
What is Legionella?
Legionella is a type of bacteria that can grow in water systems, especially where water is stored, stagnant, warm or poorly controlled. If contaminated water droplets are inhaled, they can cause Legionnaires’ disease, a serious form of pneumonia.
In dental practices, the concern is not only taps and stored water systems. Dental procedures can generate fine aerosols, and water from dental unit waterlines can be released close to patients and staff during treatment.
This is why dental practices need a risk assessment that understands both water hygiene and the clinical dental environment.
What should a dental legionella risk assessment include?
A suitable dental legionella risk assessment should be thorough, practical and specific to the practice. It should not simply tick boxes. It should identify the actual systems in use, assess the level of risk, and provide clear recommendations.
A good assessment should include:
1. Hot and cold water systems
The assessor should review the building’s domestic water systems, including mains water supply, hot water generation, stored water, outlets, pipework, sentinel points, low-use outlets, dead legs, thermostatic mixing valves, expansion vessels and temperature control.
Temperature monitoring is a key part of legionella control. Hot water should be hot enough, cold water should remain cold enough, and records should show that checks are being carried out correctly.
2. Dental unit waterlines
Dental unit waterlines are a major part of the risk assessment in a dental practice. These narrow-bore lines can encourage biofilm growth if not properly managed.
The assessment should consider how waterlines are flushed, disinfected, sampled, maintained and recorded. It should also check whether the practice has a clear procedure for managing failed dipslide results or water quality concerns.
3. Reverse osmosis systems
Many dental practices use reverse osmosis water for dental equipment, autoclaves or water bottles. These systems need proper maintenance, filter changes, water quality monitoring and clear records.
A risk assessment should check whether RO systems are being maintained in line with manufacturer guidance and whether the practice has suitable records for filter changes, TDS checks, dipslide results and remedial action.
4. Aerosol-generating procedures
Dental practices routinely carry out aerosol-generating procedures. This makes water quality particularly important because contaminated water can be released as fine droplets during treatment.
A dental-specific assessment should recognise this exposure risk and assess whether the control measures are proportionate to the way the practice operates.
5. Logbooks and record keeping
Good records are central to legionella control. It is not enough to have a risk assessment in a folder if the control scheme is not being followed.
The assessment should review whether the practice has suitable records for:
- Weekly flushing
- Monthly temperature checks
- Outlet cleaning and descaling
- DUWL flushing and disinfection
- Dipslide monitoring
- RO system maintenance
- Remedial actions
- Staff responsibilities
- Periodic logbook reviews
- Previous risk assessment actions
For many practices, the biggest issue is not the absence of effort. It is unclear, inconsistent or incomplete documentation. A specialist assessment helps turn this into a clear and manageable system.
6. Responsible person and staff duties
Every practice should know who is responsible for managing legionella risk. The assessment should identify the Duty Holder, Responsible Person and any staff members involved in water safety tasks.
It should also consider whether staff have suitable training and whether responsibilities are properly understood.
How often should a dental legionella risk assessment be reviewed?
A legionella risk assessment should be reviewed regularly and whenever there is reason to believe it may no longer be valid.
Examples include:
- Changes to the water system
- New dental chairs or surgeries
- Changes to RO systems or decontamination equipment
- Significant building work
- Changes in practice layout or usage
- Poor monitoring results
- Repeated failed dipslides
- Changes in key staff
- Concerns raised during inspection or audit
For dental practices, it is good practice to keep the assessment under active review and make sure the control scheme is being followed between formal assessments.
Common problems found in dental legionella risk assessments
DWS often finds that dental practices are trying to do the right thing, but the system has become unclear or inconsistent.
Common issues include:
- Old risk assessments that no longer reflect the practice
- Missing or incomplete logbook records
- DUWL records that are difficult to interpret
- RO filter changes not clearly documented
- Dipslide results recorded without clear remedial action
- Staff unsure who is responsible for what
- Low-use outlets not identified
- Temperature records with unexplained gaps
- Previous recommendations not fully closed off
- Practice managers left with too much uncertainty
These are exactly the areas where a specialist dental legionella risk assessment can add value.
Why choose a dental specialist rather than a general assessor?
A dental practice is a healthcare environment. It needs a risk assessment that understands dental procedures, dental waterlines, HTM 01-05, HSG274, infection control expectations and the practical pressures of running a busy practice.
A specialist dental assessor understands the difference between a normal commercial water system and a practice with multiple surgeries, daily AGPs, DUWLs, RO systems and clinical compliance expectations.
This makes the assessment more useful, more proportionate and easier to act on.
DWS: specialist legionella risk assessments for dental practices
DWS provides a premium, specialist service for dental practices that want to run a well-managed, well-documented and compliant practice.
Our service is designed for practices that want more than a generic report. We provide clear, dental-specific guidance that helps you understand what needs doing, why it matters and how to evidence good control.
DWS can support your practice with:
- Dental legionella risk assessments
- Dental unit waterline reviews
- RO system checks
- Logbook and record reviews
- Practical control scheme recommendations
- Clear action plans
- Support for practice managers and responsible persons
- Independent, professional advice tailored to dental settings
There is no long-term contract. DWS is a specialist, high-value service for practices that want confidence, clarity and a higher standard of water compliance.
Book a dental legionella risk assessment
If you are unsure whether your current legionella risk assessment is suitable for a dental practice, or if your records have become difficult to manage, DWS can help.
We work with dental practices that want to be proactive, organised and inspection-ready.
To arrange a meeting or discuss your practice, contact DWS today.