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Legionella Testing

Legionella Testing And Analysis In Lab

Ensuring your water systems are safe

If your risk assessment or routine monitoring shows that your water needs to be tested for legionella, we can guide you through the process and give advice on collecting samples.

Then, we’ll get them tested for you at one of our accredited laboratories.

Why you may need to test for legionella

Routine sampling and testing of domestic hot and cold water systems is not normally necessary. However, there are some situations where you may need to do it – and when that’s the case we’re here to help you.

Here are some reasons why you may need to test your water:

  • If your Legionella risk assessment shows that it’s necessary.
  • If you’re not sure that existing control measures are working.
  • If your system has been treated with biocide.
  • If you’re not achieving consistent temperature control.
  • If you’re not achieving consistent disinfectant concentrations.
  • If your premises are home to people who are susceptible to infection.
  • If you’ve had an outbreak of legionellosis.
  • If you know there’s been low usage, stagnation, excess storage capacity, dead-legs, excessive heat loss or crossflow in your water system.

Think you may need to be tested? Call us on 01454 417920 or email us here.

If legionella testing is required, we’ll send a technician to collect the necessary samples. Or if you’d prefer to do this yourself, we’ll be here to help and guide you through the process.

All sampling must be carried out in line with the BS7592 Sampling for Legionella Bacteria in Water guidance.  The samples will need to be taken from both your hot and cold-water systems. Depending on the size and complexity of your system, we’ll let you know how many samples you need to take and from where. Each sample will then need to be clearly labelled with the location of where it has been collected, the temperature when it was taken, and whether it was taken pre or post flushing.

We’ll send your samples for analysis to one of our UKAS accredited laboratories. As soon as the results come back, we’ll be in touch to let you know whether they’re positive or negative for legionella and provide you with a certificate to confirm that.

If your results show there are legionella bacteria in your water system, a resample will be required, just so we can double check the situation. If these results also come back positive, then we’ll help you take action.

Depending on the levels of bacteria that are present in your water, we may advise you to review your control measures, update your risk assessment to see what areas need attention, or even to fully disinfect your system. After any actions are carried out, you will need to keep retesting your water until your control measures are effective and can be maintained.

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