28
LEGIONELLA DETECTION
Legionella Count
Action
< 10 cfu/ml
A count of less than 10cfu/ml is considered satisfactory. No additional action is
required other than continuing existing maintenance and testing procedures.
Note: Less than 10cfu/ml is considered as “not detected” for the purposes of State
legislation and this procedure.
> 10 cfu/ml
Legionella detected – Decontaminate system and perform follow up water testing.
Warm water system operation, maintenance program and any water treatment
must be reviewed and rectified where necessary.
Note: The warm water system
must not be used until the decontamination procedure has been implemented
.
If a greater than 10 cfu/ml of Legionella is detected in a water sample collected from a warm water
system, the system owner must immediately shut down the system or decontaminate the system.
Decontamination of warm water systems must be performed by either:
(a)
pasteurisation (refer to “Thermal Disinfection Procedure”); or
(b)
chlorination (not documented in this procedure); or
(c)
an alternative decontamination procedure approved by the local water authority.
Irrespective of the method used, water testing should be conducted 2-4 days after the system
decontamination. The number of samples will depend on the size and complexity of the system.
If a Legionella count of 10cfu/ml or more is still detected, the actions noted in the table above must
be repeated until Legionella is not detected (less than 10cfu/ml) in 2 consecutive samples taken one
week apart or shut down the system until the problem is remedied.
Notification upon Detection
In all instances where a Legionella count of 10cfu/ml or more has been detected, the system owner
or manager MUST be informed immediately and;
All States EXCEPT Tasmania & South Australia
: If Legionella is detected (10 cfu/ml or more)
in 3 consecutive samples, the responsible officer of the site MUST Inform the Secretary (of
Health) immediately by telephone and in writing within 3 days.
Tasmania
: The Communicable Diseases Prevention Unit (a division of the Department of
health) MUST be notified upon detection (10 cfu/ml or more) within 1 working day after
initial indication of the result by phone and fax or email.
South Australia
: The local government authority MUST be notified upon detection (10
cfu/ml or more) within 24 hours after initial indication of the result by phone and fax or
email.
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