Legionnaires' disease is a potentially fatal form of pneumonia caused by the inhalation of small droplets of contaminated water containing Legionella. Legionella pneumophila is often present in natural sources of water, but when the bacteria enter human-made water systems with favorable growth conditions, then the bacteria may multiply, increasing the risk of exposure. Therefore, water system managers must undertake Legionella risk assessments to detect the presence of Legionella pneumophila in water systems.


If you have control over a premise that has a water system, then you must take appropriate steps to identify and remove or reduce the risk of exposure to Legionella.


Element has a team of qualified occupational hygienists, all of whom are members of the British Occupational Hygiene Society, that provide detailed Legionella risk assessments in accordance with the Health & Safety Executive's guidance publication "L8 Legionnaires' disease."


Element also offers Legionella and Total Viable Count (TVC) water sampling to indicate the total level of heterotrophic organisms (fungi, yeasts, molds, and bacteria) within a sample. TVC sampling indicates general contamination within a system, determining if further investigation or remedial action is necessary. 


Our occupational hygienists produce reports that outline the risk of exposure to Legionella from the water system and recommend appropriate remedial action and water management programs to be put in place to minimize the risk of exposure to Legionella.


The Legionella risk assessment report will be customized to the site but will typically be structured as follows:

  • Executive Summary (including any remedial control actions or requirements for on-going management, monitoring or training)
  • Introduction
  • The Control of Legionella Bacteria in Water Systems
  • Assessment Procedure
  • Description of Water Systems
  • Appendix 1 Risk Assessments
  • Appendix 2 Asset List and Temperature Measurements
  • Appendix 3 Photographs
  • Appendix 4 Schematics
  • Appendix 5 HSG274 Part 2 and Part 3 Checklists
  • Appendix 6 Example of Monitoring Check Sheets and Procedures
  • Appendix 7 Example of Written Preventative Scheme

For more information about our Legionella risk assessment services, contact us today.