Legionella Yearly Inspection Requirements at a Glance
HOT & COLD WATER
SERVICES TEMPERATURE CONTROL REGIME
L8 STANDARDS TO BE ADHERED TO (EXTRACTED FROM ACOP
L8)
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Frequency
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Check
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Standard to meet
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Notes
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Weekly
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Little
used outlets
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Flush
through and purge to drain, or purge to drain immediately before use, without
release of aerosols
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Monthly
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Sentinel
Taps
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The
water temperature should be below 20°C after running the water for up to two
minutes
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The
water temperature should be at least 50°C up to one minute of running the water
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This
check makes sure that the supply and return temperatures on each loop are
unchanged, i.e. the loop is functioning as required
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If
fitted, input to TMV’s on a sentinel basis
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The
water supply to the TMV temperature should be at least 50°C
within a minute of running the water
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One
way of measuring this is to use a surface temperature probe
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Water
temperatures leaving and returning to calorifier
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Check
Temperatures in flow and return at calorifiers
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Outgoing
water should be at least 60°C,
return at least 50°C
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If
fitted, the thermometer pockets at the top of the calorifier and on the
return leg are useful points for accurate temperature measurement. If installed, these measurements could be
carried out and logged by a building management system
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Quarterly or as necessary
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Showerheads
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Dismantle,
clean and descale shower heads and hoses.
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Six Monthly
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Incoming
cold water inlet (at least once in the winter and once in summer)
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The
water should be below 20°C
at all times
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The
most convenient place to measure is usually at the ball valve outlet to the
cold water storage tank
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Annually
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Calorifiers
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Visual
check on internal surfaces of calorifiers for scale and sludge
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Calorifiers
Cold
water storage tanks
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Arrange
for samples to be taken from hot water calorifiers, in order to note
condition of drain water
Visually
inspect cold water storage tanks and carry out remedial work where necessary.
Check representative taps for temperature as above on a rotational basis
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