Microbiology of Environmental Waters and Other Samples

Determination of Legionella Bacteria in Waters and Other Environmental Samples

Rationale for Surveying and Sampling

3.3.2 Safety

Methods for the Examination of Waters and Associated Materials

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3.3.2 Safety

When samples are collected for routine monitoring purposes the systems should already have been subjected to a risk assessment and suitable control and monitoring procedures should already be in place. 

The risk to sampling officers during sampling should, therefore, be minimised. 

  • However, if this is not the case, it is advisable that appropriate precautions are taken during sampling operations to minimise the production of, and exposure to, aerosols. 
  • Where appropriate, taps should be turned on and water run gently to reduce the amount of splashing. 
  • Whenever possible, samples should be taken from cooling systems at sample point locations situated on the return service to the cooling water to the tower, and as near as possible to any heat source rather than by removing an inspection hatch and collecting samples from within the tower itself. 
  • Individual staff who may be particularly prone to an increased risk of Legionella infection due to underlying conditions or immuno-suppression should not be involved in sampling operations.


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Format adapted by T2 Scientific© 2005

t2.200.1.v1.0

Source: Blue Book 200 Part 1 downloaded 27 May 2005