Matt Morse and Nick Barsby of the Legionella Control Association (LCA) take a detailed look at some of the key steps to take, and the pitfalls to avoid, in the event of positive Legionella test results.
The LCA requires its members to have in place management procedures, and appropriately competent staff, that give them the capability of responding appropriately to positive Legionella results. Positive Legionella results following sampling are one area where it’s possible to misinterpret the meaning and end up with what could at best be inappropriate expense, and, at worst, a dangerous situation and risk to life.
Sample planning
Interpretation of results starts with a suitable sample plan. If inappropriate samples are taken, results will be difficult to interpret meaningfully. Samples can be taken pre- or post-flush, and with or without disinfection of the outlet. The selection of location, type of sample, and method of analysis chosen, form part of the sample plan.
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