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Cooling Towers Risk Assessment

Cooling Towers Risk Assessment

  • • 100% Compliant with Australian WHS Acts & Regulations
  • • Fully Editable MS Word & PDF Formats Included
  • • Pre-filled Content – Ready to Deploy Immediately
  • • Customisable – Easily Add Your Logo & Site Details
  • • Includes 2 Years of Free Compliance Updates

Cooling Towers Risk Assessment

Product Overview

Identify and control organisational risks associated with Cooling Towers at a management and systems level, ensuring robust governance over design, operation, maintenance and public health exposure. This Cooling Towers Risk Assessment supports WHS Act compliance, Due Diligence obligations and the reduction of organisational and operational liability across your cooling water systems.

Risk Categories & Hazards Covered

This document assesses risks and outlines management controls for:

  • Governance, Legal Compliance and WHS Duties: Assessment of officer due diligence, PCBU responsibilities, consultation duties, and integration of cooling tower risks into the broader WHS management system.
  • Design, Engineering and System Configuration: Management of risks arising from system layout, location, drift control, access, ventilation, redundancy, and engineering controls to minimise aerosol generation and exposure.
  • Procurement, Installation and Commissioning Governance: Protocols for specification, vendor selection, commissioning checks, performance verification and handover documentation to ensure systems are compliant from day one.
  • Water Quality, Legionella and Microbial Risk Management: Assessment of microbiological hazards, Legionella control strategies, water treatment programs, biocide selection, monitoring regimes and corrective action thresholds.
  • Operation, Monitoring and System Performance Management: Management of operational parameters, routine inspections, trend analysis, alarm responses and optimisation of cooling tower performance to maintain safe conditions.
  • Planned Maintenance, Inspection and Asset Lifecycle Management: Governance of inspection schedules, cleaning programs, component replacement, corrosion control and long-term asset integrity planning.
  • Competency, Training and Supervision: Assessment of competency requirements, licensing, training content, refresher programs and supervisory arrangements for personnel involved in cooling tower management.
  • Documentation, Records and Information Management: Protocols for maintaining maintenance logs, test results, risk assessments, treatment reports, contractor records and compliance evidence for regulators.
  • Contractor and Supplier Management: Management of external service providers, including pre-qualification, scope definition, performance review, safe access arrangements and verification of treatment and maintenance activities.
  • Health Surveillance, Exposure and Public Health Interface: Assessment of worker and public exposure pathways, health monitoring requirements, liaison with public health authorities and response to suspected Legionellosis cases.
  • Emergency Planning, Incident Management and Business Continuity: Protocols for managing system failures, contamination events, suspected outbreaks, notification obligations, communication plans and continuity of critical services.
  • Change Management, Decommissioning and Continuous Improvement: Governance of system modifications, upgrades, shutdowns, decommissioning activities, post-incident reviews and ongoing improvement of the cooling tower risk management program.

Who is this for?

This Risk Assessment is designed for Business Owners, Facility Managers, Safety Managers and Compliance Officers responsible for the planning, governance and ongoing management of Cooling Tower systems and associated WHS and public health risks.

Hazards & Risks Covered

Hazard Risk Description
1. Governance, Legal Compliance and WHS Duties
  • • Failure to identify and comply with WHS Act 2011 and WHS Regulations duties in relation to cooling towers and associated plant
  • • Absence of documented organisational policy for the management of cooling towers and associated water systems
  • • Unclear allocation of PCBU, officer and worker responsibilities for cooling tower WHS risk management
  • • Lack of due diligence by officers in ensuring adequate resources, processes and verification for cooling tower risk control
  • • Failure to integrate cooling tower risks into the organisation’s WHS management system and risk register
  • • Poor contractor governance where cooling tower management is outsourced, leading to gaps in legal compliance
  • • Inadequate consultation with workers and Health and Safety Representatives (HSRs) on cooling tower risks and controls
2. Design, Engineering and System Configuration
  • • Poor system design leading to conditions conducive to Legionella and other microbiological growth (e.g. dead legs, stagnation zones, poor flow characteristics)
  • • Inadequate separation from air intakes, public areas or workspaces enabling aerosol drift and exposure
  • • Selection of cooling tower and auxiliary equipment not suited to local climate, process demands or water quality, increasing fouling and risk
  • • Insufficient provision for safe access, inspection, sampling, cleaning and maintenance (e.g. lack of platforms, fixed ladders, anchor points)
  • • Inadequate redundancy or fail-safe features in dosing, bleed-off and monitoring systems resulting in uncontrolled water quality excursions
  • • Poor segregation of incompatible systems (e.g. cross-connections between potable and cooling water) creating contamination risks
  • • Lack of engineering controls to manage noise, drift, splash and plume, affecting workers and nearby receptors
3. Procurement, Installation and Commissioning Governance
  • • Procurement of cooling towers and components that do not comply with relevant Australian Standards or regulatory requirements
  • • Selection of installers, water treatment providers or maintenance contractors without verified competence in cooling tower WHS and Legionella control
  • • Inadequate specification of WHS and performance requirements in procurement documents and contracts
  • • Poor oversight of installation, leading to deviations from design intent, undocumented changes and hidden defects
  • • Lack of formal commissioning process to verify that systems, controls and alarms operate as intended before service
  • • Failure to obtain and retain technical documentation (drawings, O&M manuals, certifications, warranties, test results) required for safe ongoing management
4. Water Quality, Legionella and Microbial Risk Management
  • • Development and proliferation of Legionella bacteria and other pathogenic microorganisms within cooling tower water systems
  • • Ineffective or inconsistent biocide dosing and water treatment regimes leading to loss of microbial control
  • • Inadequate system monitoring and trending resulting in unrecognised water quality deterioration
  • • Failure to act promptly on adverse microbiological or chemical test results
  • • Use of incompatible or poorly controlled treatment chemicals creating corrosion, scaling, or hazardous by-products
  • • Insufficient integration of water treatment system alarms and failures into broader WHS and emergency response processes
5. Operation, Monitoring and System Performance Management
  • • Lack of a defined operational strategy leading to inconsistent operation and unplanned system shutdowns or stagnation
  • • Inadequate routine monitoring of plant performance indicators (flows, temperatures, bleed-off, dosing rates, drift eliminator condition)
  • • Over-reliance on contractors without internal oversight or verification of performance data and recommendations
  • • Failure to identify and respond to abnormal operating conditions, including unexpected temperature or load variations
  • • Uncontrolled short-term shutdowns or seasonal lay-up leading to stagnation and microbiological proliferation
  • • Ineffective integration of cooling tower alarms and status information into building management systems and WHS reporting
6. Planned Maintenance, Inspection and Asset Lifecycle Management
  • • Inadequate planned maintenance resulting in deterioration of critical components (fill, drift eliminators, basins, fans, pumps, dosing systems)
  • • Absence of a structured inspection regime to identify corrosion, scaling, biofilm, leaks, structural fatigue or access defects
  • • Reliance on reactive repairs rather than proactive asset management leading to unexpected failures and elevated WHS risk
  • • Poor management of asset lifecycle, including operation of plant beyond design life without appropriate assessment
  • • Failure to document and track maintenance activities, findings and rectification actions for trend analysis and compliance evidence
7. Competency, Training and Supervision
  • • Inadequate competency of personnel involved in cooling tower operation, monitoring, maintenance and water treatment
  • • Lack of awareness among workers, supervisors and managers about Legionella risks, WHS duties and control measures
  • • Insufficient supervision of new or inexperienced staff working around cooling towers and chemicals
  • • No formal verification of contractor training, licences or qualifications relevant to cooling tower management
  • • Failure to provide refresher training leading to knowledge drift and non-compliance with current standards and procedures
8. Documentation, Records and Information Management
  • • Incomplete or inaccurate documentation of policies, procedures, drawings and system descriptions relating to cooling towers
  • • Poor record-keeping for water quality monitoring, maintenance, inspections and incident reports, limiting traceability and compliance evidence
  • • Obsolete or conflicting documents in circulation leading to inconsistent practices and confusion about current requirements
  • • Lack of ready access to critical information for workers, contractors, regulators or emergency responders
9. Contractor and Supplier Management
  • • Unclear delineation of responsibilities between the PCBU and contractors for cooling tower safety and compliance
  • • Engagement of contractors without adequate WHS systems or experience in cooling tower and Legionella risk management
  • • Inadequate monitoring of contractor performance, leading to unchecked non-conformances or unsafe practices
  • • Poor communication of site-specific hazards, procedures and emergency arrangements to contractors
  • • Fragmented supply chain (e.g. different providers for water treatment, mechanical maintenance and cleaning) resulting in gaps and overlaps in controls
10. Health Surveillance, Exposure and Public Health Interface
  • • Unrecognised exposure of workers, building occupants or members of the public to Legionella-contaminated aerosols from cooling towers
  • • Lack of protocols for identifying, reporting and investigating suspected Legionellosis cases potentially linked to the site
  • • Poor coordination between workplace WHS systems and public health authorities in the event of an outbreak or suspected link
  • • Insufficient communication to potentially affected workers or tenants during elevated risk or investigation periods
11. Emergency Planning, Incident Management and Business Continuity
  • • Lack of defined response procedures for critical cooling tower incidents such as major contamination, structural failure, loss of treatment or chemical spills
  • • Inadequate integration of cooling tower scenarios into broader emergency plans and drills
  • • Failure to consider business continuity impacts of taking cooling towers offline for safety reasons
  • • Delayed or ineffective communication with regulators, public health authorities, workers and occupants during an incident
12. Change Management, Decommissioning and Continuous Improvement
  • • Uncontrolled modifications to system design, operation, treatment regimes or occupancy patterns leading to new or increased risks
  • • Decommissioning, removal or replacement of cooling towers without appropriate planning for residual contamination, structural risk or chemical hazards
  • • Failure to learn from incidents, near misses, audit findings or regulatory updates, resulting in repeated issues
  • • Lack of systematic review of the effectiveness of the cooling tower WHS management system

Need to add specific hazards for your workplace?

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Legislation & References

This document was researched and developed to align with:

  • Work Health and Safety Act 2011
  • Work Health and Safety Regulations 2017
  • AS/NZS ISO 31000:2018: Risk management — Guidelines
  • AS/NZS 3666.1: Air-handling and water systems of buildings — Microbial control — Design, installation and commissioning
  • AS/NZS 3666.2: Air-handling and water systems of buildings — Microbial control — Operation and maintenance
  • AS/NZS 3666.3: Air-handling and water systems of buildings — Microbial control — Performance-based maintenance of cooling water systems
  • AS/NZS 3666.4: Air-handling and water systems of buildings — Microbial control — Performance-based maintenance of air-handling systems
  • AS 3896: Waters — Examination for Legionella spp. including Legionella pneumophila
  • AS/NZS 4801 / ISO 45001: Occupational health and safety management systems — Requirements and guidance for use
  • Public Health and Wellbeing Regulations (State-based): Requirements for registration, operation and management of cooling tower systems and Legionella risk management plans.
Standard Risk Assessment Features (Click to Expand)
  • Comprehensive hazard identification for all activities
  • Risk rating matrix with likelihood and consequence analysis
  • Existing control measures evaluation
  • Residual risk assessment after controls
  • Hierarchy of controls recommendations
  • Action priority rankings
  • Review and monitoring requirements
  • Consultation and communication records
  • Legal compliance references
  • Sign-off and approval sections

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