Legionella bacteria live and multiply in water systems but when released into the
air and inhaled they can cause legionnaires' disease, a potentially fatal illness.
They can live in any water systems and the legislation requires that the risk be
controlled in all commercial premises including both ‘industrial’ water systems and
‘domestic’ water systems such as toilet, kitchen and shower facilities on company
or government premises.
The control of legionella bacteria is a legal requirement under the COSHH regulations.
HSE document L8 (Legionnaires’ disease - The control of legionella bacteria in water
systems’ - Approved Code of Practice and Guidance) describes the activities that
are expected to be undertaken to adequately control the risk from legionella bacteria.
ATSL have experience in undertaking these activities on:
Evaporative cooling towers and the associated complex water systems
‘Domestic’ type water systems in offices, factories, hotels and sports facilities
Stand-alone water systems in various industrial situations (machinery cooling, cooling
troughs for plastic extrusion, washing processes etc.)
In our opinion it is important to get a realistic individual risk assessment for
your system to avoid receiving a standardised report which recommends every control
activity. The cost of ongoing un-necessary control activities can far outweigh the
cost of a good risk assessment.
provide whichever of the elements recommended in L8 that you require:
A comprehensive individual risk assessment.
The written control scheme.
A file containing all the other information required by the code and identified in
the risk assessment.
Personnel to visit site and undertake the control activities and manage the system.
Support or training for your own people to undertake the control activities and manage
We can also undertake disinfection of your water system in accordance with the recommendations
Legionella Control in Water
Legionella risk assessments - Evaporative cooling towers and other systems
Implementation of control measures - dosing, monitoring, system chlorination