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Risk Assessments

Water Hygiene and Legionella Risk Assessment

ESG teams of assessors and microbiologists are able to undertake surveys and provide risk assessment reports on aspects of the system design, installation, condition, operation and usage that present a legionellosis risk, based on guidance in ACoP L8, BS 6700 and the Water Regulations.


Legionellosis is the term given to infections caused by any of the legionellaceae family. It is a form of pneumonia, caused by the inhalation of legionella bacteriacarried by water droplets. In the UK each year there are about 250 identified cases.


Legionella bacteria are common in nature and can be found in low numbers in soil, surface waters, rivers and ponds. They can easily colonise man-made environments such as hot and cold water distribution systems, where they are able to multiply at temperatures between 20˚C and 45˚C in areas containing dirt, sludge or scale, and in stagnant water areas.


Legislation


The HSE Approved Code of Practice (L8) ‘The control of legionella bacteria in water systems’ contains a list of management actions. These are based on the Control of Substances Hazardous to Health Regulations and require:

  • An identification and assessment of risk preparation of a scheme to prevent or minimise
  • The risk from exposure to legionella
  • Systems for the management and selection, training and competence of personnel
  • Record keeping of maintenance, cleaning and disinfection.
  • Appointment of a person to be managerially responsible


Potential Risk Areas


Plant and systems particularly at risk are:-

  • Water systems incorporating a cooling tower
  • Water systems incorporating an evaporative condenser
  • Hot and cold water distribution systems
  • Showers
  • Other plant and equipment containing water which is likely to exceed 20˚C and which can release a spray or aerosol during operation or maintenance is vulnerable.


Risk Assessments


ESG teams of assessors and microbiologists provide risk assessment reports on aspects of the system design, installation, condition, operation and usage that present a legionellosis risk, based on guidance in ACoP L8, BS 6700 and the Water Regulations.


The report will contain :

  • An executive summary containing a brief description of the site, its activities and its management structure
  • Survey comments giving an overview of the systems and key points raised by the survey, and assessment of the overall risks associated with each system
  • System identification - A summary list of all systems found and inspected for legionellosis risk.
  • Surveys – The inspections surveys, temperature asset register and any other tests undertaken.
  • Photographs – Digital photographs are included where they highlight poor conditions or specific points of concern.
  • Schematics of the water systems
  • A specific evaluation of the existing written scheme for minimising the risk of legionellosis including recommendations for additional provisions.
  • A list of detailed recommendations will be included for each water system, which will be ordered by risk rating prioritising the highest risks.
  • Detailed proposals for the site specific tasks to be conducted with frequencies in order to allow the production of a control scheme.


Other Services

 

ESG's Field Teams are routinely involved will scheduled inspection, monitoring and sampling of water systems, including:

  • Visual Inspections
  • Temperature measurements
  • Sampling and bacteriological analysis
  • Remedial work such as cleaning and chlorination of tanks and outlets
  • UKAS accredited analysis for Legionella, Total Viable Count, Coliforms and E Coli at our in-house laboratories
  • Provision of web-based electronic logbooks to enable the client to effectively manage their systems, monitor control activities and ‘manage by exception’.