Italian Legionella Legal Requirements — Regulatory Framework for Facility Managers

Note for international operators

Italy has one of the most detailed national Legionella regulatory frameworks in Europe, developed following a series of major outbreaks in the 1990s and 2000s. The State-Regions Agreement of 7 May 2015 is the primary mandatory reference for risk assessment and periodic sampling. It operates alongside the occupational health statute (D.Lgs. 81/2008) and the new EU Drinking Water Directive (2020/2184), transposed as D.Lgs. 18/2023. Compliance requires an ACCREDIA-accredited laboratory using the UNI EN ISO 11731:2017 culture method — test reports from non-accredited laboratories are not accepted by Italian health authorities (ASL).

Regulatory framework

Six key regulatory references

These are the mandatory and normative documents governing Legionella prevention in Italy. Each card summarises the scope, audience and key obligations.

National guidelinesIn force

2015

State-Regions Agreement — National Guidelines for Legionella Prevention

The primary Italian regulatory reference for Legionella prevention. Signed on 7 May 2015, it defines risk assessment criteria, mandatory sampling frequency by facility type, action levels (in CFU/L) and corrective-action protocols. Compliance is a legal obligation for all facilities listed in Annex 2.

HotelsNursing homesHospitalsGymsCooling towersCondominiums

Risk assessment mandatory for hotels, nursing homes, hospitals, gyms, swimming pools, industrial facilities with cooling towers
Hot-water storage temperature ≥ 60 °C; recirculation loop ≥ 55 °C at all points
Action levels: < 100 CFU/L (no action), 100–999 CFU/L (monitoring), 1,000–9,999 CFU/L (corrective actions), ≥ 10,000 CFU/L (immediate shutdown)
Sampling methodology references UNI EN ISO 11731 culture method
Risk assessment document (DVR Legionella) must be produced, kept on-site and updated periodically

Legislative DecreeIn force — amended

2008

Legislative Decree 81/2008 — Occupational Health and Safety

Italy's consolidated occupational health and safety statute ("Testo Unico Sicurezza"). Title X (Biological Risk) requires employers to assess, document and control biological risks — including Legionella — in workplaces where the water system may expose workers to aerosols.

All employersIndustrial facilitiesHealthcareHotels

Applies to all employers with workers exposed to biological risk from water systems
Requires a written biological risk assessment (DVR) that explicitly addresses Legionella where relevant
Failure to comply exposes employers to criminal liability and fines
Cooling towers, industrial humidifiers and spa circuits in workplace settings are the primary vectors
Applies alongside — not instead of — the State-Regions Agreement 2015

EU DirectiveIn force

2020

EU Drinking Water Directive 2020/2184

Recast EU Drinking Water Directive, transposed into Italian law in 2023 (Legislative Decree 18/2023). Annex I, Part D introduces Legionella as a parametric value for indoor water distribution systems in priority premises (healthcare, care homes, accommodation). Requires risk assessment and control of the domestic distribution system.

Water suppliersBuilding ownersLarge public buildings

Introduces 'priority premises' concept — healthcare, residential care, hotels among others
Requires Water Safety Plans for large premises with complex water distribution systems
Parametric value for Legionella in hot-water systems at priority premises
Italy transposed via D.Lgs. 18/2023 — full applicability phased to 2026–2028
Strengthens existing national obligations rather than replacing them

Technical standardIn force

2017

UNI EN ISO 11731:2017 — Enumeration of Legionella

International standard for the detection and enumeration of Legionella in water samples using the culture method. The reference analytical standard for Italian compliance-grade testing. Results expressed in CFU/L on BCYE selective agar after 7–10 days incubation at 36 ± 1 °C.

Accredited laboratoriesSampling technicians

Mandatory reference method for ACCREDIA-accredited Italian laboratories
Culture on BCYE selective agar, 7–10 days at 36 °C ± 1 °C
Results in CFU/L (colony-forming units per litre)
Replaces the previous ISO 11731:1998 and EN ISO 11731-2:2008
International recognition: results from UNI EN ISO 11731:2017-accredited labs accepted across the EU/EEA

Ministerial circularIn force — amended

2000

Ministry of Health Circular — Legionella Prevention (2000)

The founding document of Italian Legionella policy. Circular 400.2/26/1370 of 5 June 2000 identified the main risk environments, introduced the first national action levels and established the framework for surveillance notification (SEIEVA system). Largely superseded by the 2015 Agreement but remains the formal baseline for historical audit trails.

HotelsNursing homesHospitals

Introduced mandatory Legionella risk assessment for hotels and healthcare facilities in Italy
First national definition of action levels and corrective-action cascade
Established SEIEVA surveillance notification pathway
Relevant for operators reviewing historical compliance records pre-2015

Accreditation standardIn force

2017

ISO/IEC 17025:2017 — Laboratory Competence

General requirements for the competence of testing and calibration laboratories. Compliance with ISO/IEC 17025 under ACCREDIA accreditation is the baseline requirement for any Italian laboratory issuing Legionella test reports that are acceptable to the Italian health authorities (ASL) for regulatory inspections.

LaboratoriesProcurement managersAuditors

ACCREDIA is Italy's national accreditation body, signatory of EA, IAF and ILAC mutual recognition arrangements
Only ACCREDIA-accredited laboratories produce test reports valid for Italian health authority inspections
ISO/IEC 17025 accreditation confirms impartiality, technical competence and measurement traceability
International mutual recognition means results are accepted across EU/EEA without re-testing

Quick reference

Mandatory sampling frequency by facility type

Based on the State-Regions Agreement 2015, Annex 2. Specific risk factors (system age, previous positive results, immunocompromised users) may require higher frequency. Always verify with a qualified risk assessment.

Facility type	Risk level	Minimum frequency	Main reference
Hotels (3+ stars)	High	Semi-annual (annual risk-assessment update)	State-Regions Agreement 2015
Hotels (1–2 stars / B&Bs)	Medium-high	Annual minimum	State-Regions Agreement 2015
Nursing homes / care facilities	Very high	Quarterly (monthly at point-of-care areas)	State-Regions Agreement 2015
Hospitals / clinics	Very high	Monthly to quarterly (risk-based)	State-Regions Agreement 2015 + DPR 14/01/1997
Gyms / wellness centres / spas	High	Semi-annual (pool areas: monthly)	State-Regions Agreement 2015
Industrial with cooling towers	High	At least quarterly	D.Lgs. 81/2008 + State-Regions Agreement 2015
Residential condominiums (centralised)	Medium	Annual (strongly recommended)	State-Regions Agreement 2015 (Annex 2)
Dental surgeries	Medium	Annual minimum	State-Regions Agreement 2015

This table is indicative. Local ASL requirements and facility-specific risk factors may impose stricter obligations. Always consult a qualified technician for a binding assessment.

Related resources

Risk assessment guide

How a Legionella risk assessment is structured in Italy, what the DVR Legionella must contain and how to commission a compliant assessment.

Testing services

ISO/IEC 17025-compliant Legionella sampling and ACCREDIA-accredited laboratory analysis across all 21 Italian regions.

Technical glossary

Definitions for CFU/L, action levels, BCYE agar, biofilm, dead-leg, UNI EN ISO 11731:2017 and 30+ further terms.

Free compliance check — 1 business day

Not sure which obligations apply to your Italian facilities?

Tell us your facility type and Italian region. We will confirm which regulations apply, what the mandatory sampling frequency is and what documentation is required for an ASL inspection. No commitment required.

Get a free compliance check View testing services

Frequently asked

Legal requirements FAQ

Six answers covering mandatory obligations, DVR Legionella, action levels and the impact of the new EU Directive on Italian facilities.

Which Italian law makes Legionella testing mandatory?

The primary mandatory reference is the State-Regions Agreement of 7 May 2015 ("Linee guida per la prevenzione e il controllo della legionellosi"), which lists facility types subject to mandatory risk assessment and periodic sampling. For workplaces, Legislative Decree 81/2008 on occupational health also applies. The EU Drinking Water Directive 2020/2184, transposed in Italy as D.Lgs. 18/2023, is adding further obligations for priority premises, phased to 2026–2028.

What is the DVR Legionella and is it mandatory?

DVR Legionella (Documento di Valutazione del Rischio Legionella) is the written risk assessment document required by the State-Regions Agreement 2015 and, for employers, by D.Lgs. 81/2008. It must record the water system layout, identified risk points, action levels, monitoring schedule and corrective actions. It must be available on-site for health authority (ASL) inspections and updated whenever there are significant changes to the water system.

What are the Italian action levels in CFU/L?

The Italian ISS action levels are: < 100 CFU/L (no action required — results recorded), 100–999 CFU/L (investigate causes, increase monitoring frequency), 1,000–9,999 CFU/L (corrective actions required — cleaning, disinfection, temperature adjustment — followed by re-sampling), ≥ 10,000 CFU/L (immediate action required, consider closing or restricting the facility until results fall below 1,000 CFU/L).

Does the EU Drinking Water Directive 2020/2184 affect my Italian hotel?

Yes. Hotels are included in the 'priority premises' definition under the Directive (Annex I, Part D). Italy transposed the Directive as D.Lgs. 18/2023. Full obligations for priority premises are being phased in; however, the existing national obligations under the 2015 Agreement remain in force and continue to apply. Operators already compliant with Italian national law are broadly aligned with the new EU framework.

What happens if my Italian facility fails a health authority inspection?

Non-compliance with the State-Regions Agreement 2015 or D.Lgs. 81/2008 can result in: written prescriptions requiring corrective action within a set timeframe, fines (administrative and, in serious cases, criminal), suspension or closure of the facility, and — if a guest or employee contracts Legionnaires' disease — civil and criminal liability for the operator. The most effective risk mitigation is a documented, up-to-date monitoring programme with ACCREDIA-accredited laboratory analysis.

Are laboratory test reports from my home country accepted in Italy?

No. For regulatory compliance purposes, Italian health authorities (ASL) require certified test reports issued by an ACCREDIA-accredited laboratory using the UNI EN ISO 11731:2017 culture method. ACCREDIA is a signatory of the EA, IAF and ILAC mutual recognition arrangements, so results are internationally recognised, but the laboratory issuing the compliance-grade report must hold Italian ACCREDIA accreditation.

LEGAL REQUIREMENTS