The Approved Code of Practice is the primary document in the UK providing practical advice and specific guidance on the control of legionella bacteria in water systems.
It outlines the requirements for duty holders to identify and assess sources of risk. This includes checking whether conditions will encourage bacteria to multiply. For example, if the water temperature is between 20–45 °C, if there is a means of creating and disseminating breathable droplets, such as the aerosol created, eg by cooling towers, showers and spa pools; and if there are 'at risk' susceptible people who may be exposed to the contaminated aerosols (see paragraphs 28–47); if appropriate, prepare a written scheme for preventing or controlling the risk (see paragraphs 58–64); implement, manage and monitor precautions – if control measures are to remain effective, regular monitoring of the systems and control measures is essential (see paragraphs 65–69).
Monitoring general bacterial numbers can indicate whether you are achieving microbiological control and sampling for legionella is another means of checking that a system is under control (see paragraph 68); keep records of the precautions (see paragraphs 70–74); appointing a competent person with sufficient authority and knowledge of the installation to help take the measures needed to comply with the law (see paragraphs 48–51).
Risk assessments
Legionella test records
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