Legionella Risk

The aim of any Legionella Risk Assessment should be to assess and record the extent, condition, design and management of all water systems within a property. It should assess and describe the risk of bacterial contamination by Legionella species, the potential for the bacteria to multiply and the potential for this to infect people with Legionnaire's disease.

Legionella Risk Assessment

The risk assessment should allow the site management to instigate remedial actions to decrease any perceived immediate risk and to implement a Legionella risk control program to manage the risks long term.

A Legionella risk assessment should be truly bespoke and should include the following information:

  • Design and physical condition of hot and cold water systems, tanks, water heaters, thermostatic mixing valves (TMVs), air conditioning and all other systems capable of posing a risk
  • Aerosol generation capability of outlets and water systems
  • Storage and distribution temperatures
  • Any areas of stagnation or dead-legs
  • Biological analysis results
  • Risk of exposure posed by each system
  • Detailed system schematics
  • Remedial works recommendations
  • Any chemical treatment requirements
  • Management regime recommendations

Legionella Risk Assessnments

The Legionella assessment should include not only the physical water system but should also include the management structure, current control systems and execution of these control mechanisms. Without adequate management a Legionella control program will always fail. When undertaking a Legionella risk assessment all recommendations should be made with the site's specific requirements in mind, taking into consideration such things as occupancy and usage.

It should also take account of such things as budgets and manpower so as to devise realistic options that the site will be able to implement. When presenting the report it should be done in such a way as to make understanding of the requirements easy. It should provide detailed remedial actions with prioritised risk ratings to enable site to remedy higher risk items first. It should also provide details of ongoing control measures such as temperature monitoring.

These should be site specific and should not include generic statements copied from guidance documents. All assets such as storage tanks and calorifiers (water heaters) should be listed as well as providing a detailed list of all outlets. Photographs should be provided to show assets and to highlight any areas of concern or specific problems.

Detailed schematic diagrams should be produced for the systems surveyed and should include all major distribution pipe work, associated plant and outlets. Whilst schematic diagrams will be based on a non-intrusive basis it is important to trace as much pipe work as possible to ensure such problems as dead legs are not present. This is particularly important in older buildings which may have undergone a number of usage changes, resulting in removal of existing outlets.

Legionella Risk Specialists

Prowater specialise in high quality Legionella Risk Assessments of all water systems. Unlike many companies we provide a fully bespoke, comprehensive Legionella Risk Assessment and management program for your site. We are experienced in providing Legionella control services across many different sectors including;

Our Legionella Risk Assessment staff are, as a minimum, City and Guilds qualified in Legionella Risk Assessments with a minimum of 3 years industry experience. We pride ourselves on QUALITY, as a poor Legionella Risk Assessment can be worse than no risk assessment and would leave you vulnerable to prosecution. Inadequate management, lack of training and poor communication have all been identified as contributory factors in outbreaks of Legionella disease.

What is Legionella?What is Legionella?

Legionnaires disease occurs as a result of infections caused by the legionellaceae family of bacteria.


Why have a Legionella Risk Assessment?Why have a Legionella Risk Assessment?

You have a legal duty to prevent exposure of employees and the general public to legionnaires’ disease.


Why have a Legionella Risk Assessment?Legionella Legal Requirements

Employers are required to control the risk of exposure to legionella bacteria in accordance with Control of Substances Hazardous to Health Regulations.


Legionella Risk Assessment Case StudyLegionella Risk Assessment Case Study

Prowater received an enquiry via our website from a nationwide firm of solicitors. They had undertaken some work on the water system within one of their office buildings, this had brought to their attention the possible requirement of a Legionella risk assessment.


Legionella Control ProcedureLegionella Control Procedure

Prowater received an enquiry via our website from a nationwide firm of solicitors. They had undertaken some work on the water system within one of their office buildings, this had brought to their attention the possible requirement of a Legionella risk assessment.


Risk Assessment ServicesRisk Assessment Services

Prowater understand what the HSE and enforcing authorities are looking for when they are looking at your Legionella risk and control scheme.


For further information about Cooling Tower Legislation please call us on 01246 813110 or email sales@prowater.co.uk - Alternatively you can complete our online enquiry form.