• Online training login
t: 0330 223 36 86     e: [email protected]
Legionella Control International
  • Home
  • Services
  • Knowledge
  • Legionnaires
  • About
  • Contact
  • Click to open the search input field Click to open the search input field Search
  • Menu Menu
You are here: / Home / Knowledge / Guidance / Legionnaires Disease – What Is an Expert Witness?

Legionnaires’ Disease – What is an Expert Witness?

Legionnaires disease expert witnessNo doubt you’ve heard of court cases where someone has been presented as an expert witness, for example during a coroner’s inquest, a complex prosecution, a civil claim or perhaps an appeal.

So, the question is what is an expert witness… well the clue is in the name: The person is considered to be an expert in a specific field of interest or topic like the control of legionella and Legionnaires’ disease. However, the role of an expert encompasses much more than this. For someone to be called upon as an expert witness, it is usually required for them to have some experience of courtroom procedures, the preparation of court documents and expert reports, and previous dealings with solicitors and barristers.

There are a number of UK registers of expert witnesses that list all individuals who are confirmed to act in this role. These are often used by lawyers to identify individuals who have the relevant amount of experience that could be used to assist them in a court case they are handling.

Giving expert evidence

Expert Evidence is the simple term given to evidence given in court by an expert witness. There is one crucial difference between the evidence given by an expert witness when compared to evidence provided by witnesses to whatever took place. Normally, a witness must only give evidence relating to what they saw or heard, i.e. they should not make assumptions or give their opinion on what happened.

This is not the case with expert witnesses. An expert witness can give an opinion based on their extensive knowledge within the subject they are expert in.

How might an expert witness be of use in a case involving a Legionnaires’ disease outbreak?

There is the potential for cases of Legionnaires’ disease to crop up whenever the level of Legionella bacteria increases in a water system beyond accepted legal limits. If this should occur in a workplace, or a setting where people should be responsible for health and safety and management of legionella risks, a court case may ensue. An investigation by the Health and Safety Executive (HSE) or Local Authority may lead to a case being brought before the courts, if it is believed the incident occurred through negligence.

  • Learn more about Legionnaires’ disease

Most lawyers and other laypeople will have very little knowledge of the control of legionella and Legionnaires’ disease, beyond which they may have read or gleaned from other sources. Being able to call on the services of a legionella expert witness with in-depth knowledge of the bacteria, Legionnaires’ disease, how it develops and the precautionary measures required by law makes it easier for evidence to be presented. It also makes it easier for the judge and/or jury to come to a decision regarding the outcome of a case.

During cases involving failures to adequately control Legionella bacteria and so prevent Legionnaires’ disease, an expert witness may not always be required, but they are useful to know about just in case.

Legionnaires’ disease experts

Legionella Control International are world-leading specialists in the control and management of legionella and Legionnaires’ disease. Our senior consultants provide specialist expert witness and litigation support services in matters relating to Legionnaires’ disease and the control and management of legionella risks. We act for a wide range of clients where prosecution or civil litigation is involved.

Our expert witness services encompass a range of technical, scientific, environmental and engineering subjects directly associated with Legionnaires’ disease and the control and management of legionella risks within the built environment.

Expert legionella risk management support

To find out more about our specialist legionella risk management services including litigation support, risk assessments, City & Guilds accredited training, water testing, and other risk management support services call us today on 0330 223 36 86 or get in touch here … contact us

London Office
Kemp House
152 City Road
London EC1V 2NX
United Kingdom
Tel: +44 (0) 203 637 47 48

Manchester Office
Warren Bruce Court
Warren Bruce Road
Manchester M17 ILB
United Kingdom
Tel: +44 (0) 161 877 0586

Further reading

For additional information about Legionnaires’ disease … here

Search Search

Expert resources…

  • Legionella & other pathogens
  • Regulatory compliance
  • Expert guidance
  • International
  • Legionnaires’ disease
  • Legionella training
  • Glossary of terms
  • FAQ
  • News

REVIEWS

4.8
Legionella Control International is rated 4.8 out of 5 stars (based on 182 customer reviews)
Read our reviews

Get in touch...

Legionella Control International
Warren Bruce Court
Warren Bruce Road
Manchester M17 1LB
United Kingdom

Manchester: +44 (0) 161 877 05 86
London: +44 (0) 203 637 47 48
Email: [email protected]

Legionella newsletter...

A simple and convenient way of keeping up to date with the latest Legionella news, new legislation, best practice, R&D and much more…

Useful downloads…

  • HSE ACOP L8 – Control of Legionella
  • HSG274 Part 1 – Evaporative Cooling
  • HSG274 Part 2 – Hot & Cold
  • HSG274 Part 3 – Other Risks
  • Positive Legionella Tests – What To Do?
  • HSG282 – Spa Pools
  • Legionnaires’ – Duty Holders Guide
  • Health & Safety – Care Homes
  • Scalding Risks – Health & Social Care
            © Copyright 2026 - Legionella Control International Ltd.
  • Link to X
  • Link to Facebook
  • Link to LinkedIn
  • Home
  • About
  • Contact
  • FAQ
  • Disclaimer
  • Privacy
  • Modern Slavery
  • Reviews
  • Sitemap
Link to: Outbreak of Legionnaires’ Disease Crops Up in Adelaide, Australia Link to: Outbreak of Legionnaires’ Disease Crops Up in Adelaide, Australia Outbreak of Legionnaires’ Disease Crops Up in Adelaide, AustraliaLegionnaires disease in Adelaide Australia 2017 Link to: Fresno County in America Reports Case of Legionnaires’ Disease Link to: Fresno County in America Reports Case of Legionnaires’ Disease Fresno County Legionnaires’ DiseaseFresno County in America Reports Case of Legionnaires’ Disease
Scroll to top Scroll to top Scroll to top

This site uses cookies. By continuing to browse the site, you are agreeing to our use of cookies.

OKLearn more

Cookie and Privacy Settings



How we use cookies

We may request cookies to be set on your device. We use cookies to let us know when you visit our websites, how you interact with us, to enrich your user experience, and to customize your relationship with our website.

Click on the different category headings to find out more. You can also change some of your preferences. Note that blocking some types of cookies may impact your experience on our websites and the services we are able to offer.

Essential Website Cookies

These cookies are strictly necessary to provide you with services available through our website and to use some of its features.

Because these cookies are strictly necessary to deliver the website, refusing them will have impact how our site functions. You always can block or delete cookies by changing your browser settings and force blocking all cookies on this website. But this will always prompt you to accept/refuse cookies when revisiting our site.

We fully respect if you want to refuse cookies but to avoid asking you again and again kindly allow us to store a cookie for that. You are free to opt out any time or opt in for other cookies to get a better experience. If you refuse cookies we will remove all set cookies in our domain.

We provide you with a list of stored cookies on your computer in our domain so you can check what we stored. Due to security reasons we are not able to show or modify cookies from other domains. You can check these in your browser security settings.

Google Analytics Cookies

These cookies collect information that is used either in aggregate form to help us understand how our website is being used or how effective our marketing campaigns are, or to help us customize our website and application for you in order to enhance your experience.

If you do not want that we track your visit to our site you can disable tracking in your browser here:

Other external services

We also use different external services like Google Webfonts, Google Maps, and external Video providers. Since these providers may collect personal data like your IP address we allow you to block them here. Please be aware that this might heavily reduce the functionality and appearance of our site. Changes will take effect once you reload the page.

Google Webfont Settings:

Google Map Settings:

Google reCaptcha Settings:

Vimeo and Youtube video embeds:

Other cookies

The following cookies are also needed - You can choose if you want to allow them:

    Download our Legionella Risk Assessment Checklist for business owners, landlords, property managers and health and safety specialists and start managing your legionella risk today.