Legionnaires' disease
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Legionnaires’ disease is the most serious of a number of diseases that can be caused by legionella bacteria. It is generally contracted by inhaling water droplets suspended in the air. | Legionnaires’ disease is the most serious of a number of diseases that can be caused by legionella bacteria. It is generally contracted by inhaling water droplets suspended in the air. | ||
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Legionella is commonly found in rivers, lakes and reservoirs, but its presence is limited and rarely causes legionnaires' disease. However, it can multiply in systems such as cooling towers, evaporative condensers, hot and cold water systems, spa pools and other plant and systems where there may be a risk during operation or maintenance, for example where: | Legionella is commonly found in rivers, lakes and reservoirs, but its presence is limited and rarely causes legionnaires' disease. However, it can multiply in systems such as cooling towers, evaporative condensers, hot and cold water systems, spa pools and other plant and systems where there may be a risk during operation or maintenance, for example where: | ||
− | *The water temperature is between 20°C and 45°C. | + | |
− | *Water droplets can be produced and dispersed. | + | * The water temperature is between 20°C and 45°C. |
− | *Water is stored or re-circulated. | + | * Water droplets can be produced and dispersed. |
− | *Deposits such as rust, sludge, scale, organic matter and biofilms are present. | + | * Water is stored or re-circulated. |
+ | * Deposits such as rust, sludge, scale, organic matter and biofilms are present. | ||
Measures must be introduced in these systems to prevent or control the risk of legionella by: | Measures must be introduced in these systems to prevent or control the risk of legionella by: | ||
− | *Controlling the release of water spray. | + | |
− | *Avoiding temperatures likely to permit the growth of legionella. | + | * Controlling the release of water spray. |
− | *Ensuring water cannot stagnate. | + | * Avoiding temperatures likely to permit the growth of legionella. |
− | *Avoiding materials that permit the growth of legionella. | + | * Ensuring water cannot stagnate. |
− | *Ensuring that systems and water are clean. | + | * Avoiding materials that permit the growth of legionella. |
− | *Treating water. | + | * Ensuring that systems and water are clean. |
+ | * Treating water. | ||
The legal framework for the control of legionella is established by: | The legal framework for the control of legionella is established by: | ||
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− | The Health and Safety Executive has published, an approved code of practice (ACOP) [http://www.hse.gov.uk/pubns/books/l8.htm Legionnaires’ disease: The control of Legionella bacteria in water systems], and measures adopted must be at least as effective as those described. | + | * The Health and Safety at Work etc Act. |
+ | * The Control of Substances Hazardous to Health Regulations (COSHH). | ||
+ | * The Management of Health and Safety at Work Regulations. | ||
+ | * The Reporting of Injuries, Diseases and Dangerous Occurrences Regulations (RIDDOR). | ||
+ | * The Safety Representatives and Safety Committees Regulations. | ||
+ | * Health and Safety (Consultation with Employees) Regulations. | ||
+ | |||
+ | The Health and Safety Executive has published, an approved code of practice (ACOP) [http://www.hse.gov.uk/pubns/books/l8.htm Legionnaires’ disease: The control of Legionella bacteria in water systems], and measures adopted must be at least as effective as those described. | ||
The approved code of practice applies to, ‘...premises controlled in connection with a trade, business or other undertaking where water is used or stored; and where there is a means of creating and transmitting water droplets (aerosols) which may be inhaled, causing a reasonably foreseeable risk of exposure to legionella bacteria.’ | The approved code of practice applies to, ‘...premises controlled in connection with a trade, business or other undertaking where water is used or stored; and where there is a means of creating and transmitting water droplets (aerosols) which may be inhaled, causing a reasonably foreseeable risk of exposure to legionella bacteria.’ | ||
It sets out duties for employers and people with responsibilities for the control of premises such as landlords. Dutyholders should take suitable precautions to prevent or control the risk of exposure to legionella, including: | It sets out duties for employers and people with responsibilities for the control of premises such as landlords. Dutyholders should take suitable precautions to prevent or control the risk of exposure to legionella, including: | ||
− | *Identifying and assessing sources of risk. | + | |
− | *Where necessary, preparing a written scheme for preventing or controlling the risk. | + | * Identifying and assessing sources of risk. |
− | *Implementing, managing and monitoring precautions. | + | * Where necessary, preparing a written scheme for preventing or controlling the risk. |
− | *Keeping records of the precautions taken. | + | * Implementing, managing and monitoring precautions. |
− | *Appointing a competent person to help take the measures needed. | + | * Keeping records of the precautions taken. |
+ | * Appointing a competent person to help take the measures needed. | ||
= Find out more = | = Find out more = | ||
=== Related articles in Designing Buildings Wiki === | === Related articles in Designing Buildings Wiki === | ||
− | *CDM. | + | |
− | *Cooling. | + | * CDM. |
− | *Cooling tower. | + | * Cooling. |
− | *COSHH. | + | * Cooling tower. |
− | *HSG 274 Legionnaires' disease, Technical guidance. | + | * COSHH. |
− | *Risk assessment. | + | * HSG 274 Legionnaires' disease, Technical guidance. |
− | *Evaporative cooling. | + | * Managing risks in existing buildings: An overview of UK risk-based legislation for commercial and industrial premises (FB 86). |
− | *Health and safety Executive. | + | * Risk assessment. |
− | *Health and safety. | + | * Evaporative cooling. |
− | *RIDDOR. | + | * Health and safety Executive. |
+ | * Health and safety. | ||
+ | * RIDDOR. | ||
=== External references. === | === External references. === | ||
− | *[http://www.hse.gov.uk/pubns/books/l8.htm Legionnaires’ disease: The control of Legionella bacteria in water systems]. | + | |
− | *[http://www.hse.gov.uk/pubns/indg458.htm Legionnaires' disease: a brief guide for duty holders]. | + | * [http://www.hse.gov.uk/pubns/books/l8.htm Legionnaires’ disease: The control of Legionella bacteria in water systems]. |
− | *[http://www.hse.gov.uk/legionnaires/index.htm HSE, Legionella and Legionnaires' disease]. | + | * [http://www.hse.gov.uk/pubns/indg458.htm Legionnaires' disease: a brief guide for duty holders]. |
+ | * [http://www.hse.gov.uk/legionnaires/index.htm HSE, Legionella and Legionnaires' disease]. | ||
[[Category:Health_and_safety_/_CDM]] | [[Category:Health_and_safety_/_CDM]] |
Revision as of 09:02, 22 July 2017
Legionnaires’ disease is the most serious of a number of diseases that can be caused by legionella bacteria. It is generally contracted by inhaling water droplets suspended in the air.
Legionnaires’ disease is a form of pneumonia that can be fatal, in particular for older people, people who smoke, heavy drinkers, people with impaired immunity, and people with illnesses such as chronic respiratory disease, kidney disease, diabetes, lung disease or heart disease.
Legionella is commonly found in rivers, lakes and reservoirs, but its presence is limited and rarely causes legionnaires' disease. However, it can multiply in systems such as cooling towers, evaporative condensers, hot and cold water systems, spa pools and other plant and systems where there may be a risk during operation or maintenance, for example where:
- The water temperature is between 20°C and 45°C.
- Water droplets can be produced and dispersed.
- Water is stored or re-circulated.
- Deposits such as rust, sludge, scale, organic matter and biofilms are present.
Measures must be introduced in these systems to prevent or control the risk of legionella by:
- Controlling the release of water spray.
- Avoiding temperatures likely to permit the growth of legionella.
- Ensuring water cannot stagnate.
- Avoiding materials that permit the growth of legionella.
- Ensuring that systems and water are clean.
- Treating water.
The legal framework for the control of legionella is established by:
- The Health and Safety at Work etc Act.
- The Control of Substances Hazardous to Health Regulations (COSHH).
- The Management of Health and Safety at Work Regulations.
- The Reporting of Injuries, Diseases and Dangerous Occurrences Regulations (RIDDOR).
- The Safety Representatives and Safety Committees Regulations.
- Health and Safety (Consultation with Employees) Regulations.
The Health and Safety Executive has published, an approved code of practice (ACOP) Legionnaires’ disease: The control of Legionella bacteria in water systems, and measures adopted must be at least as effective as those described.
The approved code of practice applies to, ‘...premises controlled in connection with a trade, business or other undertaking where water is used or stored; and where there is a means of creating and transmitting water droplets (aerosols) which may be inhaled, causing a reasonably foreseeable risk of exposure to legionella bacteria.’
It sets out duties for employers and people with responsibilities for the control of premises such as landlords. Dutyholders should take suitable precautions to prevent or control the risk of exposure to legionella, including:
- Identifying and assessing sources of risk.
- Where necessary, preparing a written scheme for preventing or controlling the risk.
- Implementing, managing and monitoring precautions.
- Keeping records of the precautions taken.
- Appointing a competent person to help take the measures needed.
Find out more
Related articles in Designing Buildings Wiki
- CDM.
- Cooling.
- Cooling tower.
- COSHH.
- HSG 274 Legionnaires' disease, Technical guidance.
- Managing risks in existing buildings: An overview of UK risk-based legislation for commercial and industrial premises (FB 86).
- Risk assessment.
- Evaporative cooling.
- Health and safety Executive.
- Health and safety.
- RIDDOR.
External references.
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