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Legionella Testing - The UK’s
Health and Safety Executives (HSE) Approved Code of
Practice and Guidance (ACoP) "Legionnaires' disease:
Control of legionella bacteria in water systems"
(L8) recommends that routine testing
for legionella bacteria in wet cooling systems be
carried out at least quarterly, and more frequently
when a system is being commissioned, or if the bacteria
has been identified on a previous occasion.
Hot Water Systems
For hot water systems such testing is only recommended
in particular circumstances, which are as follows:
- where water temperatures are reduced as a consequence
of using alternative biocide treatments. Sampling
should be done initially on a monthly basis, with
the interval increased depending on the level of
confidence in control measures;
- in systems where the control parameters (whether
temperature or biocides) are not being achieved
(frequency as required);
- when an outbreak is suspected or has been identified
(frequency as required);
- possibly in hospital wards for immunologically
suppressed patients.
Parts of this document © Crown
Copyright - originally produced and published by the
UK's Health & Safety Executive.
Additional Information
For further information and expert assistance please
call us on +44 (0) 161 877
0586 or email info@legionellacontrol.com.
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