Established in 1990 with a fantastic reputation within the water industry for reliability, competence and professionalism. We are water treatment/hygiene and occupational environmental consultants who specialise in the management and control of Legionella bacteria within water systems.

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What Is Legionella?

Legionellosis is a collective term for diseases caused by legionella bacteria including the most serious Legionnaires ’ disease, as well as the similar but less serious conditions of Pontiac fever and Lochgoilhead fever. Legionnaires’ disease is a potentially fatal form of pneumonia and everyone is susceptible to infection.

The risk increases with age, but some people are at higher risk, eg people over 45, smokers and heavy drinkers, people suffering from chronic respiratory or kidney disease, diabetes, lung and heart disease or anyone with an impaired immune system. The bacterium Legionella pneumophila and related bacteria are common in natural water sources such as rivers, lakes and reservoirs, but usually in low numbers.

They may also be found in purpose-built water systems, such as cooling towers, evaporative condensers, hot and cold water systems and spa pools. If conditions are favourable, the bacteria may multiply, increasing the risks of Legionnaires ’ disease, and it is therefore important to control the risks by introducing appropriate measures.

Approved Code of Practice and guidance on regulations (L8)

Legionnaires’ disease is normally contracted by inhaling small droplets of water (aerosols), suspended in the air, containing the bacteria. Certain conditions increase the risk from legionella if:
Water is stored and/or re-circulated.
The water temperature in all or some parts of the system may be between 20–45 °C, which is suitable for growth.
It is possible for water droplets to be produced and if so, they can be dispersed.
There are deposits that can support bacterial growth, such as rust, sludge, scale, organic matter and biofilms.
It is important to control the risks by introducing measures which do not allow proliferation of the organisms in the water systems and reduce, so far as is reasonably practicable, exposure to water droplets and aerosol. This will reduce the possibility of creating conditions in which the risk from exposure to legionella bacteria is increased.

Approved Code of Practice and guidance on regulations (L8)

Contact Us

If you're looking for a quick online quote, or for any more information regarding our services, training or legionella treatment in general, please get in touch and we'll respond as quickly as possible.

Alternatively call us at 01484 841817 or send us an email to

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Programmed Environmental Maintenance Limited

7 Waterside, Bridge Street, Slaithwaite, West Yorkshire. HD7 5BA.

Tel: 01484 841817 Email:

Providing service across Wakefield, Halifax, Huddersfield, Sheffield, Manchester, Kirklees, South Yorkshire, East Yorkshire, West Yorkshire, Lancashire and more

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