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Legionella Risk Assessment

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.

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.

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Call 0161 483 7112 to book an appointment. Available 24/7

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What does a Legionella Risk Assessment cover?

The 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.

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.

Contact Acorn Environment Services Today

Frequently Asked Questions

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.

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

There is currently no cap on fines for Legionella. However, examples show companies being fined nearly £2 million after failing a legionella test

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