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 more
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Prowater understand what the HSE and enforcing authorities are looking for when they are looking at your Legionella risk and control scheme more
In order to manage Legionella using temperature the system should be regularly monitored (at least monthly) to determine that temperature is adequate throughout the system to maintain control more
Legionnaires disease is contracted by inhaling small droplets of water suspended in air which contain the legionella bacterium more
Legionella Risk Assessments
Prowater Limited specialise in high quality risk assessments of all water systems. Unlike many companies we provide a fully bespoke risk assessment and management program for your site.
We have a broad experience of site types and client needs from the largest industrial sites to the smallest office blocks, and you can be confident that the Legionella risk assessor we would provide you would have all the relevant experience and training they need to give you the best possible advice and support.
We pride ourselves on QUALITY, as a poor risk assessment can be worse than no risk assessment and would leave you vulnerable to prosecution. Look at how we perform risk assessments and when obtaining quotes make sure that you get a like for like high quality assessment.
We are confident that our risk assessment service is amongst the most comprehensive and detailed available.
Contact us today for more information about how Prowater can help you with Legionella Risk Assessment , chlorinating mains water, chlorinating downservices and water tank chlorination.
Legionella Risk Assessment
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.
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. The Legionellaassessment 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.
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 Control Procedure
The aim of any Legionella control program should be to prevent the infection of individuals with Legionellaand subsequently avoid Legionnaire's Disease. This can be done in a number of ways and a qualityLegionella risk assessment should highlight these in detail and determine which would be the most effective for the particular system in question.
The Legionella bacteria is generally controlled through either chemicals or temperature. Welfare style hot and cold water systems are generally controlled through temperature whilst cooling towers and process systems are normally controlled using chemicals. It is possible for there to be some overlap and in fact Chlorine Dioxide is an excellent chemical choice for the control of Legionella within welfare style water systems as it can be used safely in drinking water.
In order to manage Legionella using temperature the system should be regularly monitored (at least monthly) to determine that temperature is adequate throughout the system to maintain control. In general if temperatures of the cold remain below 20° C and hot water remains above 50° C then the system is considered under control, although this is a very simplistic view and many other factors such as the cleanliness of the system and presence of stagnant pipe work can influence the risk. These temperatures must be recorded and if they fall outside these recommended levels then remedial action should be taken and actions recorded.
Management of Legionella using chemicals requires increased monitoring due to the generally more complex nature of these systems. Chemicals can either be oxidising or non-oxidising biocides and should be dosed on a continual basis, preferably by an automated system that monitors biocide levels constantly. Biocide dosing rate and maintenance levels will depend upon the biocide species in use but is typically 0.5-2.0 ppm for oxidising biocides. Chemical control of Legionella generally occurs in cooling tower and due to their high risk status it is advisable to employ a specialist chemical water treatment/Legionella control company to help in the management.
As a company we are experienced in providing complete Legionella control and management packages to all types of business and industry. We can provide bespoke chemical treatment packages and regular analysis to ensure continued effectiveness. Our trained Legionella technicians can provide temperature monitoring and recording of welfare type hot and cold water systems and we provide full reporting of any remedial actions required.