Legionella Risk Assessment

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Legionella Risk Assessment

Acorn Environment Services provide specialist water safety and legionella risk assessment solutions for the control of Legionnaires’ disease in the workplace. We help employers, landlords and property owners meet their obligations under current UK health and safety law to keep people safe.

All UK businesses, including property owners and landlords must carry out and maintain an accurate, up to date risk assessment for the control of legionella in their premises.

Our assessments meet the legal requirements set out in the Health & Safety Executives ACOP L8, HSG274, HTM healthcare documents and the Care Quality Commission standards.

Legionella Risk

A legionella risk assessment by Acorn.

Each of our legionella assessments will identify your risks and their significance, additionally they will go on to explain how you can manage them effectively and so comply with the law.

Our specialist water safety solutions include expert legionella assessments, in-field water sampling, laboratory water analysis and full support services to ensure the risks associated with Legionnaires’ disease are managed to meet the UK’s regulatory compliance standards.

Our detailed water safety assessments are delivered by fully trained risk assessors who can perform a detailed examination of all man-made water systems at your premises, together with a review of the risk management and control processes you have in place to manage the risks associated with Legionnaires’ disease through exposure to Legionella bacteria.

Contact Acorn today to arrange a legionella risk assessment of your property.

Cold water tank

What does a Legionella Risk Assessment cover?

The Legionella Risk Assessment takes into account the following factors:

  • Water Temperature
  • Water Stagnation
  • Potential for Aerosol Formation
  • Heat Gain / Loss Potential
  • Condition of the Water
  • Condition of all water systems
  • The Susceptibility of persons exposed on site

Acorn Environment Services also provides legionella water testing services.

How often do I need a Legionella Risk Assessment?

(HSG 274 (part 2), page 53)The risk assessment should be reviewed regularly and whenever there is reason to believe the original assessment may no longer be valid, for example:

  • Where there have been changes to plant, the water system or its use
  • Where there have been changes to the use of the property
  • Where new information about risk or control measures have become available
  • Where temperature monitoring indicates that control measures are no longer effective

The risk assessment would include all hot and cold water services. All information would be recorded on audit forms and collated within a single document. This document will be supplied to the client in either PDF or physical folder format.

Temperature measurements would be completed, checked and evaluated. The following standards should be met:

  • Hot water stored at 60°C and above.
  • Hot water at outlets to be a minimum of 50°C within one minute of running
  • Cold water stored below 20°C
  • Cold water at outlets to be a minimum of 20°C within two minutes of running

A colour schematic drawing will be produced showing a layout of water systems within the property.

All areas requiring remedial action would be covered in the recommendations section of the report. A written quotation for these works will be made available to the client upon request.

Keeping Records

Keeping Records

If you have five or more employees you have to record any significant findings, including those identified as being particularly at risk and the steps taken to prevent or control risks. If you have less than five employees, you do not need to write anything down, although it is useful to keep a written record of what you have done.

Records should include details of the:

– Person or persons responsible for conducting the risk assessment, managing, and implementing the written scheme
– Significant findings of the risk assessment
– Written control scheme and details of its implementation
– Details of the state of operation of the system, ie in use/not in use
– Results of any monitoring inspection, test or check carried out, and the dates

These records should be retained throughout the period for which they remain current and for at least two years after that period. Records kept in accordance with (e) should be retained for at least five years.

From our clients

Trust Pilot


"I rang out of hours for a wasp nest and someone came that evening and sorted the problem for me and my little boy as he's highly allergic, he was friendly & helpfull and reassuring, would highly recommend them really easy to contact Friendly team"

Amanda Grimes


"Excellent Service thanks for attending so promptly and dealing with the problem and taking into consideration the complex needs of the situation."

Natalie Hatzer


"Really grateful to Demi and the team for assisting at such short notice. Prompt service which ran smoothly. Highly recommend!"

Arielle Halter


"Used Acorn for a garden/yard clearance! Superb service! The two guys who came (Chris and Chris) were polite, professional and friendly. Start to finish it took no more than half an hour! Very impressed, would highly recommend."

Ian Collett


"Acorn came to remove a wasps nest from the time to reporting it to Acorn arriving to remove it was a total of 3 hours. I was so impressed. The lads who came were very helpful, professional and polite. Great value for money and I will be recommending to all my family and friends"

Tracie Jackson


"I had a pigeon problem so I contacted Acorn, they came out and got rid for me. They also did a house clearance for me at the same time. I was amazed at the quality of the work done, and the aftercare. I would 100% recommend them."

Martin Cowell

Customer reviews

Frequently asked questions

Can Legionella Disease be prevented?

Yes, by managing systems where legionella is most likely found. Secondly, contacting a professional who can complete treatment on sources where the risk of legionella is high is also advised.

How can a person contract Legionella's Disease?

Legionnaires’ disease can be contracted when water droplets containing Legionella bacteria enter a person’s lungs.

How much could you be fined for Legionella?

The amount you could be fined for Legionella depends on the specifics of each case. In the UK, fines for Legionella can range from £2,500 to £20,000 and you could serve up to 2 years in prison.