The obligation
The Code mandates specific minimum maintenance frequencies for cooling towers, air-handling systems, heated/cold water systems, and spas, including monthly, quarterly, and annual tasks.
Minimum maintenance obligations include: cooling towers — monthly water quality monitoring, monthly microbiological (total count), quarterly Legionella sampling, monthly sump/packing inspection, quarterly component inspection, annual clean and disinfection; air-handling systems — monthly inspection of valves, pipes, spray nozzles, humidifiers, tanks/trays, annual clean/disinfection; heated water systems — monthly WMS effectiveness assessment, monthly treatment unit inspection, raise to 60°C at
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- What
- The Code mandates specific minimum maintenance frequencies for cooling towers, air-handling systems, heated/cold water systems, and spas, including monthly, quarterly, and annual tasks.
- Source
- worksafe.wa.gov.au
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maintenance
cooling towers
inspection
frequency
water temperature
Official sources
Frequently asked questions
Which WHS law does this come from?
Minimum Maintenance and Inspection Frequencies is a WHS requirement set out in Prevention and control of legionnaires disease (WA). It is made under Work Health and Safety Act 2020 (WA). The relevant provision is Prevention and Control of Legionnaires Disease > Maintenance.
What does this WHS obligation require?
Minimum Maintenance and Inspection Frequencies is a WHS obligation under Prevention and control of legionnaires disease (WA). In short, The Code mandates specific minimum maintenance frequencies for cooling towers, air-handling systems, heated/cold water systems, and spas, including monthly, quarterly, and annual tasks.
What changed recently?
Minimum Maintenance and Inspection Frequencies was last updated on 25 August 2026.
