What happens when duty holders get it wrong. The landmark UK cases, the fines, and how the courts now sentence Legionella failings - increasingly in six and seven figures, with directors and managers personally on the hook.
Each dot is one prosecution on this page, plotted by year and fine (the scale is logarithmic, because fines run from £100 to £3m). Note how the larger fines cluster after the 2016 sentencing guideline. Hover a dot for the case.
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How the courts punish Legionella failings
A duty holder who fails to manage Legionella risk is usually prosecuted under the Health and Safety at Work etc. Act 1974 and COSHH, judged against ACoP L8 and HSG274. Since the 2016 sentencing guideline, the numbers have changed sharply.
Fines for organisations are now based on the offender’s turnover, the level of culpability, and the risk of harm created - not just whether anyone was actually harmed. (Sentencing Council definitive guideline, in force 1 February 2016.)
Fines under the Health and Safety at Work Act are unlimited. Large organisations now routinely face six- and seven-figure fines for serious failings.
Individuals can be prosecuted too: employees under section 7, and directors or managers under section 37 where an offence is committed with their consent, connivance or neglect. Individuals can face imprisonment.
Where a death results from a gross corporate failure, a company can also be charged with corporate manslaughter (Corporate Manslaughter and Corporate Homicide Act 2007), with fines that can reach into the millions.
Notable prosecutions
30 documented UK cases, from the country’s worst outbreak to recent fines - across care homes, hospitals, social housing, councils, factories and cooling towers, hot tubs and holiday parks. Not a complete list, but it shows the range. Each links to a source.
Sanctuary Housing
Social housing (sheltered)
2024
£900,000+ £11,480.60 costs
The landlord poorly managed the Legionella risk in the water system at Vincent Naughton Court, Birkenhead, with staff inadequately trained and supervised. A warning letter told residents the water could be boiled but failed to tell them to stop using their showers.
Outcome
No deaths; vulnerable residents exposed. All 44 water samples at the site tested positive and residents were evacuated in 2018
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Liverpool Crown Court
The facilities-management contractor failed to act on a 2016 Legionella risk assessment, had no written scheme of control in place, and did not monitor or maintain safe water temperatures in the prison’s water system.
Outcome
One man died - Graham Butterworth contracted Legionnaires’ disease at HMP Lincoln and died on 5 December 2017
Breach
Health and Safety at Work etc. Act 1974 · Lincoln Magistrates’ Court
Cooling towers the firm had inherited at its West Bromwich site were in extremely poor condition, letting Legionella grow in the towers and pipework and exposing workers, neighbours and the public.
Outcome
Five people contracted Legionnaires’ disease near the site; one needed intensive care and ventilation
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974 · Birmingham Magistrates’ Court
Legionella was allowed to grow in the water supply at Fordingbridge Care Home, exposing residents to risk. The company admitted two charges of failing to provide safe care and treatment.
Prosecuted by the Care Quality Commission (CQC), not the HSE - a rare CQC Legionella prosecution.
Outcome
A resident, Andrew Clegg (56), died after contracting Legionella
Breach
Regulation 12, Health and Social Care Act 2008 (Regulated Activities) Regulations 2014 · West Hampshire Magistrates’ Court
Two directors ran a cooling tower with no biocide and no risk assessment, ignoring their own water-treatment advisers. Each was given a 12-week prison sentence suspended for 12 months - a reminder that individuals, not just companies, can be prosecuted.
The penalty was a suspended custodial sentence plus costs, not a fine.
Outcome
No illness reported; workers and the public exposed, with premises near two major hospitals
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974 · Birmingham Magistrates’ Court
For more than a year during refurbishment works, Bupa failed to implement the controls and monitoring needed to safely manage a care home’s hot and cold water system, and failed to properly train the staff responsible. The resident is thought to have been infected from a hot tap in his room.
The £3m fine was reduced to £1.5m on appeal in October 2019.
Outcome
One resident died - Kenneth Ibbetson, 86, contracted Legionnaires’ disease and died in June 2015
Breach
Section 3(1), Health and Safety at Work etc. Act 1974
A recirculating water system at the Boldon factory in Tyne and Wear became contaminated with Legionella. The judge found that "dead legs" left stagnant water and the biocide treatment regime was ineffective.
Reduced to £380,000 on appeal (2019). A separate £800,000 fine was imposed for an unrelated 2015 factory explosion.
Outcome
Five people fell ill between October 2014 and June 2015; one was placed in an induced coma
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974 · Newcastle Crown Court
An annex to the William Budd ward sat on a separate water loop that went unrecognised from its opening in 2009 until 2015, so the required temperature checks and Legionella tests were never carried out over that period.
Outcome
A patient, Terence Brooks (68), died of Legionnaires’ disease in July 2015
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Bristol Crown Court
The council failed to adequately manage water systems at several of its leisure centres, including Walton-on-the-Naze Lifestyles, where a member of the public caught Legionnaires’ disease from the showers.
Outcome
A man was hospitalised for 18 days with Legionnaires’ disease, sepsis, pneumonia and kidney failure after using the showers
Breach
Health and Safety at Work etc. Act 1974 · Colchester Magistrates’ Court
Council environmental-health officers visiting after a guest got an electric shock found 43 further safety issues, including no Legionella management, plus asbestos, COSHH and lifting-equipment failings.
Outcome
No illness reported; staff and guests exposed, with "no formal attempt" to manage Legionella in the Colchester hotel’s water system
Breach
Health and Safety at Work etc. Act 1974 (five offences) · Colchester Magistrates’ Court
A heated spa pool left on display for sale for about five months was never risk-assessed or properly maintained, letting Legionella reach harmful levels. HSE considered a corporate manslaughter charge before accepting a guilty plea to the health-and-safety offence.
Outcome
Two men (Richard Griffin and William Hammersley) died of Legionnaires’ disease and around 19 others fell ill in the 2012 Stoke-on-Trent outbreak; a third man’s death was attributed to a pre-existing condition
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Stafford Crown Court
At its Harlow depot, G4S had no contract with the firm that had assessed its water system, left most of 17 high-risk issues unresolved, trained staff inadequately and had no schematic of the complex system - taking almost three years to reach minimum standards.
Prosecuted by Harlow Council; the £1.8m fine was upheld when the company was refused permission to appeal in 2017.
Outcome
No infection confirmed at the site; workers and visitors exposed to risk
Breach
Sections 2 and 3, Health and Safety at Work etc. Act 1974 · Chelmsford Crown Court
Long-standing failings at the council-run intermediate-care facility included Legionella training well below the required standard, poor temperature checks on mixing valves, showerheads not descaled or disinfected, and ineffective flushing of little-used outlets.
Outcome
A resident, Lewis Payne (95), died after contracting Legionnaires’ disease at The Willows care home in 2012
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Reading Crown Court
The operator repeatedly failed to manage and implement procedures to control Legionella in the home’s water systems, and had not checked the technical competence of the contractor it engaged to maintain them.
Prosecuted by Ashfield District Council; the judge said funding pressures were no excuse for failing to keep residents safe.
Outcome
A 90-year-old resident, John Bonser, contracted Legionnaires’ disease at Kestrel Lodge care home and died in November 2012
Breach
Health and Safety at Work etc. Act 1974 · Nottingham Crown Court
After the leisure-club manager was dismissed, the spa pool was not properly drained, cleaned or disinfected for over two months; Legionella was found in pool-side and changing-room showers.
Operator of the then Landmark Hotel (now DoubleTree by Hilton), Dundee. Scottish case (COPFS).
Outcome
65 people fell ill and 18 were confirmed with Pontiac fever after a 2011 outbreak at the hotel’s leisure-club spa pool
Breach
Health and Safety at Work etc. Act 1974 · Dundee Sheriff Court
For over a year from 2011 the firm failed to manage Legionella in cooling towers at its Somercotes and Eastwood sites. An HSE inspector felt spray on his face from corroded towers, and water sampling found Legionella so high that immediate action was needed.
Outcome
No infections reported; workers and nearby residents exposed to dangerously high Legionella levels
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974 · Derby Crown Court
Two cooling towers at the Newport site ran for around five years with no risk assessment, no written scheme, missing drift eliminators, no water-treatment programme and untrained staff.
Outcome
No illness reported; risk to staff and the public near a housing estate and within 1km of a hospital
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974
Brighton and Sussex University Hospitals NHS Foundation Trust
NHS hospital
2015
£50,000+ £38,705.60 costs
Running the Royal Sussex County Hospital, the Trust failed to act on a long history of failings: between October 2010 and November 2011, 114 positive Legionella tests and 651 records of water temperatures outside the required range were not adequately addressed.
Outcome
Linked to the 2011 death of patient Joan Rayment (78); an inquest recorded natural causes
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Lewes Crown Court
The home ignored an HSE Improvement Notice and, despite two deadline extensions, still failed to carry out a suitable Legionella risk assessment of its water systems.
A risk-based prosecution for ignoring an enforcement notice; total to pay was £40,000.
Outcome
No infection; up to around 50 elderly residents and staff at the Wallasey home put at potential risk
Breach
Health and Safety at Work etc. Act 1974 · Liverpool Crown Court
Records showed water stored below recommended temperatures and warnings to site advisers went unactioned. With the company in administration, the judge imposed a nominal £1,000 - but said a £500,000 fine would have been appropriate had the business been profitable.
The company was in administration, so the £10,000 costs order was not enforced. The CPS found insufficient evidence to charge corporate manslaughter.
Outcome
Two guests in the same chalet contracted Legionnaires’ disease; one died
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974 · Preston Crown Court
The board had no suitable Legionella risk assessment and no safe scheme to control the risk; the strain that infected the patient matched the shower she used daily.
Scottish case, prosecuted by the Crown Office (COPFS).
Outcome
A 64-year-old patient at Hartwoodhill Hospital contracted Legionnaires’ disease in 2008 and needed intensive treatment, including a tracheotomy
Breach
Section 3, Health and Safety at Work etc. Act 1974 · Hamilton Sheriff Court
The resort near Dundee failed to carry out a suitable water risk assessment. The Legionella strain that killed the guest was found in the hot tub and two showerheads in the lodge where his family had stayed.
Scottish case, prosecuted by the Crown Office (COPFS). The original £150,000 fine was reduced to £120,000 for the guilty plea.
Outcome
A visitor, Edward Warnes (60), contracted Legionnaires’ disease and died in 2008
Breach
Sections 3(1) and 33(1), Health and Safety at Work etc. Act 1974 · Forfar Sheriff Court
The car-parts manufacturer had no up-to-date risk assessment and failed to properly clean and maintain the cooling water systems used in its processes.
Its water-treatment contractor, Aegis Ltd, was prosecuted alongside it; the two cases together totalled close to £250,000.
Outcome
No infections reported; workers and the public put at risk by a poorly managed cooling system at the Brierley Hill plant
Breach
Sections 2(1) and 3(1), Health and Safety at Work etc. Act 1974 · Wolverhampton Crown Court
The contractor engaged to manage Legionella in the cooling water at Eaton’s Brierley Hill plant failed to do so adequately - a reminder that the contractor, not just the site operator, carries duties.
Co-defendant with site operator Eaton Ltd (above).
Outcome
No illness reported; the public and workers left at risk through a poorly managed cooling system it was contracted to treat
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Wolverhampton Crown Court
A poorly maintained air-conditioning cooling unit at the council-run Forum 28 arts centre spread Legionella across the town centre. The council and an employee were acquitted of manslaughter, but the council pleaded guilty to a health-and-safety breach. Architect Gillian Beckingham was separately fined £15,000 under section 7.
Outcome
7 people died and around 180 fell ill in the 2002 Barrow-in-Furness outbreak - the UK’s worst at the time
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Preston Crown Court
Cooling towers at HP Bulmer’s cider plant were not kept on an effective cleaning, treatment and disinfection regime. Nalco, the water-treatment contractor, and HP Bulmer were each fined £300,000.
Co-defendant HP Bulmer Ltd received the same £300,000 fine plus £50,000 costs.
Outcome
The 2003 Hereford outbreak caused 26 cases of Legionnaires’ disease, two of them fatal
Breach
Section 3(1), Health and Safety at Work etc. Act 1974 · Hereford Crown Court
The hotel’s health-and-safety consultant admitted charges over the outbreak - an example of an individual adviser, not just the company, being personally prosecuted.
Outcome
Linked to the Copthorne Hotel Cardiff outbreak that killed two guests and made five others ill
Breach
Health and Safety at Work etc. Act 1974 · Cardiff Crown Court
Read this before quoting the figures. These are selected, reported cases, not a complete record - HSE does not publish Legionella-specific prosecutions as a single dataset. Fines and costs are taken from the cited public reports; some fines are later changed on appeal (Bupa’s £3m became £1.5m). Outcomes turn on the specific facts of each case. This page is general information about enforcement, not legal advice - for your own situation take competent advice.
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