BS 8580-1:2019 Risk assessments for Legionella control and water quality

BS 8580-1:2019

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

Status : Current   Published : January 2019



BS 8580-1:2019 is also available with tracked-changes. To learn more and buy, click HERE.

Tracked-changes versions of Revised Standards

This year, BSI is offering tracked-changes versions of key standards that have been revised, to help users see clearly what's changed and what's stayed the same. BSI is pleased to say that BS 8580-1 can be bought as a simple standard or as a 'tracked-changes package' where customers receive both the new standard and a tracked-changes version. See the tracked-changes standard here.

What is this standard about?

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.

Who is this standard for?

  • 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 water quality standard can also be extended to include ships water systems.

Why should you use this standard?

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.

What’s changed since the last update?

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.

Blog: What you need to know about the revised Legionella Risk Assessment Standard

Standard NumberBS 8580-1:2019
TitleWater quality. Risk assessments for Legionella control. Code of practice
Publication Date30 January 2019
Normative References(Required to achieve compliance to this standard)BS 7592
Informative References(Provided for Information)BS 6920, Control of Substances Hazardous to Health (Amendment) Regulations (Northern Ireland) 2005, BS EN ISO 11731, Control of Substances Hazardous to Health Regulations 2002, Work at Height (Amendment) Regulations 2007, BS EN ISO 19458, Management of Health and Safety at Work (Amendment) Regulations (Northern Ireland) 2006, BS EN ISO 27000:2017, Health and Safety at Work etc. Act 1974, Management of Health and Safety at Work (Amendment) Regulations 2006, Confined Spaces Regulations (Northern Ireland) 1999, HSG 65:2013, Work at Height (Amendment) Regulations (Northern Ireland) 2007, Water Supply (Water Fittings) Regulations (Northern Ireland) 2009, Confined Spaces Regulations 1997, HSG 282:2013, BS EN 17125, BS 5918, Water Supply (Water Fittings) Regulations 1999, BS EN ISO 16484-2:2004, BS 31100:2011
ReplacesBS 8580:2010
Draft Superseded By18/30367523 DC
DescriptorsAir-conditioning systems, Visual inspection (testing), Water testing, Water, Swimming pools, Quality, Cooling towers, Risk assessment, Bacteria, Biological hazards, Hot-water supply systems, Water supply (buildings), Microorganisms, Water supply and waste systems (building, Cold-water supply systems, Contamination
ISBN978 0 580 51636 8
File Size1.856 MB

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