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WHO framework · Italian building systems

WATER SAFETY PLAN

LEGIONELLA CONTROL — ITALY

A practical guide to the WHO Water Safety Plan (WSP) framework applied to Legionella prevention in Italian buildings — how it aligns with mandatory Italian regulations, who needs it and how to integrate it with the DVR Legionella.

Commission a Water Safety PlanLegionella risk assessmentLegal requirements

WHO Guidelines for Drinking-Water Quality — 4th edition, 2017

What is a Water Safety Plan?

A Water Safety Plan (WSP) is the WHO-recommended framework for ensuring safe drinking water from catchment to consumer. The approach is risk-based — identifying hazards before problems occur, validating control measures and monitoring their performance continuously — rather than relying solely on end-point testing.

Applied to building water systems, the WSP methodology directly addresses Legionella risk: it maps every amplification point (temperature excursions, stagnation zones, aerosol-generating outlets), defines control limits aligned with Italian regulatory thresholds and provides the management structure required for sustained compliance.

In Italy, the mandatory DVR Legionella (risk assessment document) is structurally consistent with the WSP approach but focuses exclusively on Legionella. A full WSP extends the DVR Legionella to cover all water-quality hazards and align with EU Directive 2020/2184 (recast Drinking Water Directive) requirements for risk-based management of domestic water systems.

WHO framework — six pillars

The six pillars of a Water Safety Plan

The WHO WSP framework organises water safety management into six interconnected pillars. Each pillar has a direct counterpart in Italian Legionella regulatory requirements.

01

System assessment

Characterise the entire water supply chain from the municipal connection or private well to the last point of use. Document pipe materials, storage tank configuration, recirculation loops, cooling towers and all aerosol-generating outlets. Identify hazards and hazardous events at each step.

Italy / Legionella

For Legionella, the system assessment maps every location where temperature, stagnation or aerosol generation can promote growth — mirroring the Italian DVR Legionella survey requirement.

02

Control measures

Define operational control measures that prevent, eliminate or reduce each identified hazard to an acceptable level. For Legionella in building water systems this typically includes thermal control, biocide programmes, physical flushing of low-use outlets and design improvements such as dead-leg removal.

Italy / Legionella

Italian guidelines (State-Regions Agreement 2015) mandate specific temperature thresholds: hot water stored at ≥ 60 °C, distributed at ≥ 55 °C, cold water kept below 20 °C — directly equivalent to WSP critical control limits.

03

Operational monitoring

Establish routine operational monitoring at each control measure: temperature logging, biocide residual checks, physical inspections and periodic environmental water sampling. Define monitoring frequency, responsible personnel and corrective action triggers.

Italy / Legionella

Under Italian regulations, monitoring plans must be documented in the DVR Legionella. Sampling frequency is risk-stratified: quarterly for hospitals, semi-annual for 3-star hotels, annual review for lower-risk premises.

04

Management and communication

Document management procedures for normal operations, incident response and emergency situations. Assign clear responsibilities, establish escalation paths and maintain communication protocols with health authorities, occupants and insurers.

Italy / Legionella

When Legionella counts exceed 10,000 CFU/L in Italy, mandatory notification to the local health authority (ASL) is required. The WSP incident response procedure provides the operational framework for this obligation.

05

Supporting programmes

Implement programmes that underpin the WSP: staff training and competency, calibration of monitoring equipment, supplier quality assurance, infrastructure maintenance schedules and hygiene audits.

Italy / Legionella

Italian Legionella control requires personnel responsible for water management to receive documented training aligned with the State-Regions Agreement 2015 Annex 5 competency framework.

06

Verification and validation

Verify that the WSP is being implemented as designed through internal audits, external inspections and review of monitoring records. Validate that control measures are effective in preventing health risk through periodic health outcome surveillance and comprehensive water testing.

Italy / Legionella

ACCREDIA-accredited laboratory testing under UNI EN ISO 11731:2017 provides the analytical validation evidence required by Italian regulators and constitutes the highest-confidence verification tool in any Italian WSP.

Implementation guide

Seven steps to a compliant Water Safety Plan

Follow this sequence to implement a WSP that simultaneously satisfies WHO best practice, EU Directive 2020/2184 risk-based requirements and Italian mandatory DVR Legionella obligations.

  1. Establish the WSP team

    Assemble a multi-disciplinary team covering building operations, water hygiene, EHS compliance and, where applicable, clinical or public-health expertise. Designate a WSP coordinator with documented authority.

    Deliverable: WSP team register with roles, competencies and contact details

  2. Describe the water supply system

    Produce or verify a comprehensive as-built schematic of all water systems — supply, storage, distribution, recirculation, cooling and all terminal outlets. Identify building occupants and their vulnerability profile.

    Deliverable: System description document with annotated schematic

  3. Conduct hazard identification and risk assessment

    For each system component, identify potential hazards (microbiological, chemical, physical) and hazardous events. Score the likelihood and severity of each risk. For Legionella, apply the Italian DVR Legionella risk-scoring methodology aligned with the State-Regions Agreement 2015.

    Deliverable: Hazard and risk register — doubles as the DVR Legionella risk register

  4. Identify and validate control measures

    Map existing controls against each identified risk. Identify gaps. Validate that planned controls are technically capable of achieving target risk reduction (e.g., confirm that the boiler can sustain 60 °C at storage). Add corrective investments where needed.

    Deliverable: Control measure inventory with validation evidence

  5. Develop a monitoring plan

    Define what to monitor, where, how often, who is responsible and what triggers corrective action. Set operational limits (critical limits and alert limits) for each control measure. Align with Italian mandatory sampling frequencies by facility type.

    Deliverable: Documented monitoring plan with sampling schedule and action levels

  6. Establish corrective action and incident response procedures

    Define step-by-step responses for each scenario: alert level breach, action level breach, confirmed Legionnaires' disease case, media enquiry and regulatory inspection. Include ASL notification procedures where mandatory.

    Deliverable: Incident response and corrective action procedures

  7. Document, review and improve

    Compile the complete WSP document set, implement, then schedule an annual review — or earlier following a significant change to the system, a positive result or an outbreak. Incorporate lessons learned from audits and incidents.

    Deliverable: Complete WSP document; annual review log

Framework comparison

WSP vs DVR Legionella — key differences

International operators often ask how the WHO Water Safety Plan relates to the mandatory Italian DVR Legionella. The table below clarifies the scope, legal status and practical relationship between the two frameworks.

AspectWHO Water Safety PlanItalian DVR Legionella
OriginWHO Guidelines for Drinking-Water Quality (4th ed., 2017)Italian State-Regions Agreement 7 May 2015 / D.Lgs. 81/2008
ScopeAll drinking-water hazards (microbiological, chemical, physical)Legionella spp. specifically in building water systems
Legal status in ItalyVoluntary international best-practice frameworkMandatory for hotels, hospitals, nursing homes, cooling towers and other listed facility types
Risk approachComprehensive hazard analysis aligned with HACCP principlesRisk register scored against ISS criteria — subset of WSP methodology
Laboratory standardFlexible — references ISO 11731 as primary methodMandatory: ACCREDIA-accredited laboratory, UNI EN ISO 11731:2017
Language of outputAny (English for multinational operators; Italian for Italian-language submissions)Italian — legally required for ASL inspections
Audit trailInternal WSP document set and external verification reportsDVR Legionella held on-site, updated after each sampling campaign
Applicability

Who benefits from a full Water Safety Plan?

Beyond the mandatory DVR Legionella, a full WHO-aligned WSP adds value for organisations that must demonstrate international-standard water safety governance.

International hotel groups

Head-office EHS standards (ISO 22000, brand audit frameworks) often require a risk-based water safety management system that extends beyond national minimums. A WSP provides the auditable documentation trail required by global brand standards.

Hospitals and healthcare networks

Joint Commission International (JCI) and other accreditation bodies require water management programmes consistent with WHO and CDC guidance. A WSP integrates with infection-control programmes and satisfies JCI Water Management requirements.

Institutional investors and REITs

ESG due diligence increasingly requires evidence of systematic water risk management across property portfolios. A WSP provides the documented risk register and monitoring evidence required for ESG reporting and insurance underwriting.

Industrial and food production facilities

Process water risk management under ISO 22000 / HACCP requires a systematic hazard-analysis approach for all water uses. A WSP for process and potable water systems integrates Legionella control within the broader HACCP framework.

Related resources

Further reading for international operators

Legionella risk assessment

Mandatory DVR Legionella methodology: six-step process, ISS action levels, ACCREDIA-accredited sampling and compliance documentation for Italian facilities.

Read more →

Legal requirements

Complete Italian regulatory framework: State-Regions Agreement 2015, D.Lgs. 81/2008, EU Directive 2020/2184 and UNI EN ISO 11731:2017.

Read more →

Testing services

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

Read more →

English WSP documentation included

Commission a Water Safety Plan for your Italian facilities

Tell us your facility type, Italian region and approximate size. We will assess whether a full WSP or a DVR Legionella alone is appropriate, and propose a scoped plan with a fixed-cost quote within one business day. English WSP documentation is included as standard for international clients.

Commission a Water Safety PlanView pricing
Frequently asked

Water Safety Plan FAQ

Six answers covering legal obligations, the WSP–DVR relationship, EU directive alignment and English-language documentation for multinational operators.

Is a Water Safety Plan mandatory in Italy?

A Water Safety Plan in the strict WHO sense is not a mandatory legal requirement in Italy. However, the Italian mandatory Legionella risk assessment (DVR Legionella) is structurally consistent with the WSP approach — covering hazard identification, risk scoring, control measures, monitoring and corrective actions. For international operators seeking alignment with WHO best practice, implementing a WSP that encompasses and extends the mandatory DVR Legionella is the recommended approach.

How does the WSP relate to EU Drinking Water Directive 2020/2184?

EU Directive 2020/2184 (recast Drinking Water Directive) explicitly requires Member States to implement risk-based approaches for drinking-water management from catchment to tap, closely aligned with the WHO WSP concept. Italy is transposing this Directive. For buildings with internal water systems (Article 10 of the Directive — risk assessment for domestic distribution systems in priority premises), the WSP methodology provides the technical framework for compliance.

Can the Water Safety Plan replace the DVR Legionella?

No. The DVR Legionella (Documento di Valutazione del Rischio Legionella) is a legally required Italian document that must be produced, held on-site and presented to health authority (ASL) inspectors. A WSP can incorporate the DVR Legionella as one of its outputs, but cannot substitute for it. Practically, the WSP provides the management framework and the DVR Legionella is the site-specific risk register and sampling record mandated by Italian law.

What is the WHO definition of a Water Safety Plan?

According to the WHO Guidelines for Drinking-Water Quality (4th edition, 2017), a Water Safety Plan is 'the most effective means of consistently ensuring the safety of a drinking-water supply through a comprehensive risk assessment and risk management approach that encompasses all steps in water supply from catchment to consumer.' The WSP framework comprises system assessment, identification and validation of control measures, operational monitoring, management and communication procedures, supporting programmes, and verification/validation.

Which types of Italian facilities most benefit from a full WSP?

Facilities that benefit most from a full WSP approach (beyond the minimum DVR Legionella) are: international hotel chains and resort groups seeking alignment with head-office EHS standards; hospitals and nursing homes with complex water systems and highly vulnerable occupants; large-scale food and beverage production facilities; and any facility that must demonstrate WHO-level water safety assurance to international insurers, ESG auditors or accreditation bodies.

Do you produce the WSP in English?

Yes. We produce Water Safety Plan documentation in English for multinational operators managing Italian facilities. The English WSP document set includes the system description, hazard and risk register, control measure inventory, monitoring plan, incident response procedures and an annual review template. The mandatory Italian-language DVR Legionella is produced as a companion document for ASL inspections.