Does a dental practice need a Legionella Risk Assessment?
Yes. Under UK health and safety law, whoever is responsible for a dental practice must assess and control the risk from Legionella bacteria in its water systems. This duty comes from the Health and Safety at Work etc. Act 1974 and the COSHH Regulations 2002, and HSE explains how to meet it in its Approved Code of Practice (L8) and guidance (HSG274).
A small practice may well have a simple water system and a low level of risk. But that is something an assessment establishes, not something you can assume.
Why does Legionella matter in a dental practice?
Legionella bacteria occur naturally in water. When conditions allow them to multiply, and contaminated water is then breathed in as fine droplets or aerosols, they can cause Legionnaires' disease, a serious form of pneumonia.
Dental practices need particular care because water is used throughout the building, and some treatments use water-fed instruments that generate aerosols directly in the treatment room. A practice assessment should look at:
Dental unit waterlines and treatment room outlets
Hot and cold water systems, including any storage tanks or calorifiers
Handwashing sinks, taps and staff and patient facilities
Showers, where fitted
Infrequently used outlets
Dead legs and other pipework where water can stagnate
What does a Legionella risk assessment involve?
A Legionella risk assessment is a site-specific review of your water systems. It identifies what could allow Legionella to grow or spread, and sets out what you need to do about it. It should never be a generic template. A competent assessment will look at:
Where your water comes from and how it is heated and distributed
Whether water is stored, and at what temperatures the hot and cold systems run
Dead legs, rarely used outlets and other areas of stagnation
The dental unit water systems in each surgery
Your existing maintenance and control measures
Who is responsible for managing the risk
The result should be a written report with a clear, prioritised action plan, not just a list of observations.
What about dental unit waterlines?
Dental units contain narrow-bore tubing where biofilm can build up, and biofilm gives Legionella and other bacteria a place to live. Your assessment should therefore cover the waterlines in each unit and how they are managed day to day (for example, flushing routines, disinfection and the type of water supplying each unit).
Legionella control should work alongside your existing infection prevention procedures, including HTM 01-05 (or the equivalent guidance in Scotland, Wales and Northern Ireland) and the equipment manufacturers' instructions, not replace them.
Does a dental practice need Legionella water testing?
Not automatically. Having a risk assessment does not mean you must carry out routine Legionella sampling. Whether testing is needed depends on what the assessment finds.
Testing also cannot fix an underlying problem. If water is stagnating or temperatures are wrong, a clear sample result doesn't make the system safe. The priority is to find and control the conditions that let Legionella grow. Where testing is appropriate, it should support the wider control plan.
What if the practice closes for a few weeks?
Closures for Christmas, refurbishment, building work or reduced opening hours all mean water sits unused, and stagnant water is where Legionella thrives. Your practice should have a written procedure for managing the water system during long periods of non-use and before reopening. Exactly what that involves (flushing, temperature checks, waterline treatment) depends on your system and your risk assessment.
How often should the assessment be reviewed?
There is no legal requirement to commission a new assessment every 12 months. The assessment must, however, be reviewed regularly and whenever there is reason to think it is no longer valid, for example after:
New dental units or other equipment are installed
Plumbing or hot water system changes
Refurbishment or building work
A long closure
Changes to how the practice operates
Monitoring results that show a problem
Who is responsible?
The dutyholder, meaning the owner, employer or person in control of the premises, is responsible for making sure Legionella risk is assessed and controlled. The assessment must be carried out by someone competent, either in-house or an external specialist. Using an outside company doesn't transfer your legal responsibility, so you still need to act on the findings.
Do I need a Legionella certificate?
There is no legal requirement for a dental practice to hold an annual "Legionella certificate". What the law requires is that you assess and control the risk. A certificate from a test or a one-off visit is not proof of compliance on its own, so keep your risk assessment, your action plan and records of the control measures you carry out.
What if we've never had an assessment?
Book one. A competent assessor will establish what water systems you have, identify any foreseeable risks and tell you what controls are needed. The aim is a practical understanding of your own system, not a stack of paperwork.
Legionella risk assessments for dental practices from Absolute Water Compliance
We carry out Legionella risk assessments for organisations across the UK. Our City & Guilds qualified engineers have 20+ years of industry experience, and each assessment is based on the systems actually in your practice. You receive [a written report, a prioritised action plan and advice on ongoing monitoring: edit to reflect what you actually provide].
Responsible for a dental practice and unsure where you stand? Contact us to arrange a Legionella risk assessment.
What I changed and why
The opening now stands alone. Your original began with "Yes." and depended on the page title. I made the question the heading so it works as a search snippet.
Named the legal basis. The vague "UK guidance identifies dental practices" became specific references to the Act, COSHH, L8, HSG274 and HTM 01-05. Please check these against your own sources before publishing, especially the devolved-nation guidance.
Cut repetition. The "size doesn't matter" and "testing isn't a substitute" points each appeared two or three times.
Fewer hedges, more direction. Less "may" and "should consider", and more of what a dutyholder actually needs to do.
Added consequences. I added Legionnaires' disease, the action-plan output and record-keeping, so the reader sees why it matters.
Stronger close. The "why choose us" section now needs your real deliverables. I put a placeholder in brackets, and I'd only add accreditations such as Legionella Control Association membership if they're true.
Taking these steps seriously is not just about compliance - it is about protecting lives. Absolute Water Compliance pride themselves on carrying out a wide range of water compliance services, visit our knowledge hub for more.
Comments