Free cooling tower monthly legionella compliance log
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Free cooling tower Legionella inspection checklist per AS 3666. Monthly water quality, chemical treatment and drift eliminator checks. Download free.
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See the first part of the cooling tower monthly legionella compliance log below. Download the full version above.
What is a cooling tower monthly legionella compliance log?
A cooling tower Legionella inspection is a monthly risk control assessment required under AS 3666 (Air-handling and water systems of buildings - Microbial control) to prevent the growth and dissemination of Legionella pneumophila bacteria from cooling water systems. Cooling towers are recognised as one of the highest-risk sources of Legionnaires disease outbreaks because they create ideal conditions for bacterial growth (warm water between 20 and 45 degrees Celsius, nutrients from organic matter, biofilm formation on surfaces) and then aerosolise contaminated water droplets through drift that can travel hundreds of metres downwind.
AS 3666.2 (Operation and maintenance of air-handling and water systems) requires monthly inspections covering water quality parameters (heterotrophic colony count, Legionella testing, pH, conductivity, biocide residual), chemical treatment system function, drift eliminator condition, tower structural integrity and mechanical component operation. Additionally, AS 3666.3 provides a performance-based alternative maintenance approach. State and territory public health legislation reinforces these requirements with severe penalties for non-compliance, including the power to issue immediate shutdown notices. Outbreaks traced to a cooling tower can result in multiple fatalities, class action lawsuits and criminal prosecution of building owners and maintenance providers. This checklist covers the monthly inspection requirements plus triggers for the 6-monthly comprehensive cleaning mandated by AS 3666.2.
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Benefits of using this cooling tower monthly legionella compliance log
- Outbreak prevention: systematic monthly inspection of all Legionella risk factors minimises the probability of bacterial amplification to dangerous levels in the cooling water system.
- Regulatory compliance: satisfies AS 3666.2 monthly inspection requirements and provides documentary evidence for public health authority audits and licence conditions.
- Early detection: monitoring water quality trends (HCC, Legionella, biocide residual, pH) identifies deteriorating conditions before they reach actionable alert levels.
- Legal defence: documented monthly inspections demonstrate the duty holder took reasonably practicable steps to control Legionella risk, which is essential if an outbreak investigation occurs.
- System performance: monthly checks on drift eliminators, fill media, fans and chemical dosing systems also identify maintenance issues that reduce cooling efficiency.
- Penalty avoidance: state public health regulators can impose immediate shutdown notices and fines exceeding $100,000 for non-compliant cooling tower maintenance. Documented inspections prevent this.
Benefits of digitising forms in MapTrack
When you digitise cooling tower checklists in MapTrack, you get:
- Field users can easily scan a QR code to complete a form on mobile. Unlimited users.
- Automatically get alerts when faults are identified.
- Link every form digitally as a PDF to the relevant asset, location or person.
- Receive a digital PDF copy with every submission to your email.
- Ability to share forms digitally.
- Build conditional logic (show or hide questions based on answers).
- Take pictures or attach photos. Not possible with a paper-based form.
- Electronic signatures.
- Edit forms later without reprinting.
- Restrict permissions (who can view, complete or approve).
- Build forms with AI (describe what you need and MapTrack suggests the form).
- Trigger work orders automatically when a fault is logged during an inspection.
- Track service intervals by hours, kilometres or calendar date in one place.
- Attach supplier invoices and parts receipts to each maintenance record.
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What to include in a cooling tower monthly legionella compliance log
This cooling tower monthly legionella compliance log covers 9 key areas:
- System identification: cooling tower location, system number, manufacturer, model, number of cells, total system volume, water treatment provider.
- Water quality results: heterotrophic colony count (HCC), Legionella test result (if taken this month), pH, conductivity, total dissolved solids, biocide residual (type and concentration).
- Chemical treatment system: dosing pump operation, chemical stock levels, bleed-off controller function, conductivity controller calibration, inhibitor and biocide concentrations.
- Drift eliminators: condition (intact, damaged, displaced), cleanliness, correct seating, no bypass paths for drift.
- Tower structure and basin: basin cleanliness, sediment level, overflow and make-up function, structural condition, access ladder and platform condition.
- Mechanical components: fan operation (vibration, noise, balance), motor condition, belt tension (if belt-driven), gearbox oil level, bearings.
- Fill media condition: fouling, scaling, biological growth, damage, airflow distribution.
- Temperature monitoring: supply water temperature, return water temperature, approach to wet bulb.
- Actions and non-conformances: corrective actions for any parameter outside acceptable range, trigger for 6-monthly comprehensive clean if required.
How to use this cooling tower monthly legionella compliance log
- Review previous month inspection results and any outstanding corrective actions.: Before attending site, review the previous monthly inspection report for any non-conformances or developing trends. Check whether previous corrective actions have been completed. Review the most recent water quality test results from the water treatment provider. Confirm PPE requirements for cooling tower inspection (minimum eye protection, gloves, respiratory protection if tower is operating).
- Collect water samples and test on-site parameters before disturbing the system.: Collect water samples for laboratory analysis (HCC and Legionella culture) from the basin or return line per the sampling protocol. Test on-site parameters including pH, conductivity, total dissolved solids, temperature and biocide residual using calibrated field instruments. Record supply and return water temperatures. Compare all results against the AS 3666 action levels and the site-specific water management plan.
- Inspect the chemical treatment system, dosing equipment and controllers.: Verify all dosing pumps are operational and delivering the correct dose rates. Check chemical stock levels and confirm delivery is scheduled before depletion. Test the conductivity controller calibration against a reference standard. Verify the bleed-off system is functioning correctly. Confirm biocide and inhibitor concentrations are within the water management plan targets.
- Inspect drift eliminators, fill media, basin and tower structure.: Visually inspect drift eliminators for damage, displacement, fouling or bypass paths that allow untreated drift to escape. Inspect fill media for fouling, scaling, biological growth and physical damage. Check the basin for sediment accumulation (trigger 6-monthly clean if sediment depth exceeds 5mm). Inspect the tower structure for corrosion, leaks and deterioration. Confirm access ladders and platforms are safe.
- Check mechanical components, record findings and schedule corrective actions.: Inspect the fan for vibration, unusual noise and correct rotation direction. Check belt tension or direct-drive coupling condition. Verify gearbox oil level and condition. Inspect motor terminals and connections. Record all findings on the inspection form. For any parameter outside acceptable range, record the corrective action, responsible person and completion date. Escalate any result that triggers an AS 3666 alert or action level.
In MapTrack, you can schedule and track maintenance digitally. Each submission is stored as a timestamped PDF against the asset record.
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Back to download formHow often should you complete this checklist?
Monthly inspections are the minimum frequency required by AS 3666.2 for cooling tower systems in operation. The 6-monthly comprehensive cleaning (involving system shutdown, draining, physical cleaning of all wetted surfaces and disinfection) is triggered by condition or at maximum 6-monthly intervals. Additional inspections are required after system shutdowns exceeding 5 days, after any maintenance that disrupts biocide treatment, or if water quality results exceed alert levels. In MapTrack, monthly inspection schedules are automated with due-date tracking, while water quality results can be trended over time to identify deteriorating conditions before they reach actionable Legionella thresholds.
Frequently asked questions
Applicable regulatory standards
This template aligns with the following regulations and standards:
- AS 3666.1 Air-handling and water systems of buildings - Microbial control: Design, installation and commissioning
- AS 3666.2 Air-handling and water systems of buildings - Microbial control: Operation and maintenance
- AS 3666.3 Air-handling and water systems of buildings - Microbial control: Performance-based maintenance
- Public Health Act (VIC, NSW, QLD, WA, SA, TAS, ACT, NT) - Cooling tower registration and maintenance
Need to schedule and track maintenance digitally?
Register every cooling tower in MapTrack, attach digital forms, and get a complete history of every inspection, service and compliance record.
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