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Homepage>BS Standards>07 MATHEMATICS. NATURAL SCIENCES>07.100 Microbiology>07.100.20 Microbiology of water>BS 8580-1:2019 - TC Tracked Changes. Water quality Risk assessments for Legionella control. Code of practice
immediate downloadReleased: 2019-01-31
BS 8580-1:2019 - TC Tracked Changes. Water quality Risk assessments for Legionella control. Code of practice

BS 8580-1:2019 - TC

Tracked Changes. Water quality Risk assessments for Legionella control. Code of practice

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Standard number:BS 8580-1:2019 - TC
ISBN:978 0 539 03830 9
Status:Tracked Changes

A tracked changes version of a Standard indicates the changes made, during the standards revision process, between the active standard and its previous version. Additions, deletions, and other formatting and/or content revisions are clearly displayed as underlined and strikethrough texts, ensuring all changes made between the two documents are quickly and easily identified. This version of the standard includes both a copy of the new standard, along with a track changes version.

BS 8580-1:2019 Content

Legionnaires’ disease is caused by bacteria of the genus Legionella which can colonize artificial water systems and equipment containing water. This standard supplies guidance on a way to conduct Legionella risk assessments, which are a legal requirement. The Management of Health and Safety at Work Regulations 1999 and the Control of Substances Hazardous to Health Regulations 2002 make specific requirements for risk assessment. These regulations apply to the control of Legionella and are embodied in the Approved Code of Practice and guidance document, Legionnaires’ disease: The control of Legionella bacteria in water systems , otherwise known as ACoP L8.


  • Water supply managers 
  • Building engineers
  • Principle contractors, contractors, designers, installers and commissioners
  • Risk assessors
  • Health & Safety inspectors
  • Health industry managers
  • Building services engineers
  • Water treatment consultants
  • Public buildings owners and operators
  • Anybody involved in the management of private water supplies and building water systems
  • Those responsible for the safe management of water systems especially within hospitals and the healthcare industry, leisure centres, schools, swimming pool engineers, etc.

The standard can also be extended to include ships water systems.


It gives recommendations and guidance on the assessment of the risk of Legionellosis presented by artificial water systems. It applies to any undertaking involving a work activity or premises controlled in connection with a trade, business or other undertaking where water is used or stored in circumstances that could cause a reasonably foreseeable risk of exposure to legionellae and contracting Legionellosis.

The standard applies to risk assessments being undertaken on premises, plant and systems for the first time, and to review and audit where a previous assessment has been undertaken and where control measures might have been implemented.


The standard has been renamed (from BS 8580 to BS 8580-1) and revised to align it with the HSE ACoP L8 (4th edition) (Approval code of Practice) and associated guidance documents such as HSG 274 (Legionnaires' disease – Technical guidance) which were revised in 2014.

The HSE decided to separate the ACoP (Approval Code of  Practice) from the guidance, with the latter being developed by industry groups as Health and Safety Guidance (HSG) 274 (Legionnaires' disease, Technical guidance) Parts 1, 2 and 3.

  • HSG 274 Part 1 is concerned with cooling towers
  • HSG 274 Part 2 is concerned with hot and cold water services
  • HSG 274 Part 3 is concerned with “other” systems

They all include a recommended inspection frequency.

Following the revision of the above documents, one description of the risk assessment process and outputs does not fit all. For example residential property assessments are at one end and hospitals at the other.

The revision also takes into account HSG 282 - Control of legionella and other infectious agents in spa-pools  – a system that was published in January 2017. There was also a need to update references within the standard.


This standard BS 8580-1:2019 - TC Tracked Changes. Water quality is classified in these ICS categories:

  • 07.100.20 Microbiology of water
  • 13.060.70 Examination of biological properties of water