Run an estate that straddles the UK and continental Europe and you hit a problem the guidance rarely addresses head-on: two well-regarded control regimes, one portfolio, and no single rulebook that tells you which to apply where. The pragmatic fix is not to crown a winner. It is to build one group standard from the stricter of each.
Inside the UK the position is settled. ACoP L8 carries legal weight under the Health and Safety at Work etc. Act, and HSG274 is the technical detail duty holders work to day to day [1][2]. Cross the Channel and that scaffolding falls away. Each country runs its own law, its own enforcement and, often, its own numeric thresholds, which is exactly where the ESGLI guidelines earn their place.
Where ESGLI fits in the hierarchy
The European technical guidelines for the prevention, control and investigation of infections caused by Legionella species are produced by ESGLI, the ESCMID Study Group for Legionella Infections, working alongside the surveillance ECDC coordinates across Europe [4]. They are technical guidance, not legislation. National laws still sit above them, and below them sit your individual buildings.
That makes ESGLI useful in a way UK-only teams sometimes miss: it is the common reference layer that lets you compare a site in Manchester with one in Munich or Milan without translating every national statute first. It does not replace local law. It gives you a shared technical vocabulary to set policy across it.
How the two regimes actually compare
On first principles the regimes agree, because both rest on the same foundations the WHO sets out, keep hot water hot, keep cold water cold, keep water moving, and design out stagnation [3]. The everyday control parameters track each other closely. The UK figures you already know, hot water stored at around 60°C and delivered so it reaches roughly 50°C, or about 55°C in healthcare, within a minute or so; cold water held below about 20°C, are the ones HSG274 sets out [2]. ESGLI’s recommended parameters broadly mirror this temperature-led approach, though you should confirm the exact thresholds against the current edition rather than assume they are identical, because continental climates and definitions can shift the cold-water figure in particular.
The genuine divergence is one of monitoring philosophy, and it is the thing a group standard has to reconcile.
UK practice is control-led. The emphasis falls on the risk assessment, the written scheme, temperature monitoring and a maintained system; routine Legionella culture sampling is something you do in defined circumstances, healthcare, high-risk populations, where temperatures cannot be held, or to verify a regime, rather than as the default proof of safety [2]. Several continental regimes, and ESGLI’s framing, lean harder on routine Legionella culture sampling with numeric action levels expressed in colony-forming units per litre, triggering graded responses as counts rise. Neither is “more correct”. They are different routes to the same outcome, and an estate spanning both has to decide deliberately how much sampling its group standard requires, verify the specific action levels and frequencies against ESGLI and the relevant national rules before you write them in.
The second divergence is legal: HSG274 is technical guidance tied to the UK’s ACoP L8 framework, whereas in much of Europe the binding instrument is national law, with ESGLI as the technical backbone beneath it.
A framework for setting your group minimum standard
When you procure one Legionella policy across borders, you are effectively buying a standard rather than a product. The selection logic is the same: define what it must achieve, interrogate it against criteria, and watch for the red flags. Use the framework below to set a group minimum that no site is allowed to fall under.
What the group standard has to achieve
- Meet or exceed the stricter of the UK and the local national requirement at every site, on every parameter, never the average, never the most convenient.
- Stay legally defensible in each jurisdiction, so a UK enforcement officer and a continental inspector both recognise a compliant building.
- Remain auditable from the centre, with comparable records regardless of country.
The criteria to set it against
- Temperature regime: adopt the tighter hot- and cold-water targets where UK and local figures differ, and record the source for each.
- Sampling stance: decide where you sit on the control-led to sampling-led spectrum, then apply the more demanding of UK practice and the national duty per site, some countries mandate sampling the UK would treat as optional.
- Risk assessment basis: require a competent, site-specific assessment everywhere, written to a recognised methodology such as BS 8580-1 for UK sites and an equivalent locally [5].
- Roles and accountability: name a duty holder or local equivalent, a responsible person and a route to a competent advisor for every building, however the local law titles them.
- Records and review triggers: standardise the logbook, the review frequency and the action thresholds so head-office oversight is genuinely comparable.
Questions to ask a pan-European service provider or advisor
- Which national regulations apply to each of our sites, and where do they exceed UK HSG274 or ESGLI?
- Will you map every parameter to the stricter requirement, or default to local minimums?
- How will your reporting let me compare a UK site and a continental one on the same dashboard?
- Who is the competent person in each country, and what is their accreditation?
Red flags
- A provider who treats HSG274 as sufficient everywhere, or assumes ESGLI overrides national law. It does neither.
- A single template applied unchanged across countries with different sampling duties.
- Vagueness about which national thresholds bite, or an inability to evidence local competence.
The mistake that catches multinational teams
The recurring error is assuming compliance travels. A regime built faithfully around HSG274 does not automatically satisfy a continental site, and a continental site passing its national audit is not automatically working to the standard a UK auditor expects. ESGLI helps you see the gap, but it is the reconciliation, taking the stricter line at each site, that closes it. The group standard is the deliverable; ESGLI and HSG274 are two of the inputs.
This is general guidance on reconciling published technical frameworks, not legal advice for any jurisdiction. The controls, sampling and thresholds for each building must come from a competent, site-specific risk assessment that accounts for the national law where the building sits, and where UK and local duties differ, take advice in both before you finalise the group standard.
FAQ
Does following HSG274 automatically make a continental European site compliant?
No. HSG274 is UK technical guidance tied to ACoP L8 and UK law. A continental site is governed by its own national regulations, which may impose sampling duties, action levels or registration requirements HSG274 never mentions. HSG274 is a strong baseline, but compliance is established against the local law, not transplanted from the UK.
If ESGLI and a national law disagree, which one wins?
The national law. ESGLI provides pan-European technical guidance, but it is not legislation and does not override a member state’s statutory requirements. Where they differ, follow the law; use ESGLI to interpret good practice and to set a group standard that sits at or above both. Confirm the specific national duties for each country rather than relying on the European guideline alone.
Should we adopt routine Legionella sampling across the whole group just to be safe?
Not reflexively. Routine culture sampling is valuable where the regime, the population or the local law calls for it, but blanket sampling without a control regime behind it generates data nobody acts on. Set sampling per site against the stricter of UK practice and the national duty, and make sure each result has a defined action threshold and owner.
Is ESGLI legally binding anywhere?
In itself, no, the ESGLI guidelines are technical guidance. Their parameters can become effectively binding where a national regulator adopts or references them, so their legal force depends on each country. Treat them as the authoritative European reference, then check how the relevant national framework has taken them up.
What to do next
Pull a list of every site outside the UK and, for each, write down two things beside it: the national regulation that governs it, and where that regulation is stricter than HSG274 or ESGLI on temperature and sampling. That single sheet is the skeleton of your group minimum standard, and it usually reveals within an afternoon which sites are quietly running to the wrong rulebook.
Sources
- HSE, ACoP L8 (2013), “Carrying out a risk assessment”, p.12. https://www.hse.gov.uk/pubns/books/l8.htm
- HSE, HSG274 Part 2 (2024), “Operation and inspection of hot and cold water systems”, p.70. https://www.hse.gov.uk/pubns/books/hsg274.htm
- World Health Organization, “Legionella and the prevention of legionellosis”. https://www.who.int/publications/i/item/9241562978
- European Centre for Disease Prevention and Control, “Legionnaires’ disease”. https://www.ecdc.europa.eu/en/legionnaires-disease
- BSI, BS 8580-1:2019, clause 4 (factors to be considered in the risk assessment). https://www.bsigroup.com/