​Cooling water systems must be managed safely in order to prevent the growth and transmission of Legionella bacteria.
Occupiers must ensure that their cooling water systems comply with the Public Health Act 2010 (the Act) and the Public Health Regulation 2022 (the Regulation).

Last updated: 01 September 2022

​Who is the occupier?

The Act defines the occupier as either the:

  • owner of a premises (for example, building) where a cooling water system is located
  • person entitled to occupy the premises (for example, leaseholder or tenant)
  • owners corporation of premises under a strata scheme.

What are the responsibilities of the occupier?

The occupier must ensure that the cooling water system is installed, operated and maintained in accordance with the Act, the Regulation and AS/NZS 3666:2011 Air-handling and water systems of buildings - Parts 1, 2 and 3.
This includes compliance with six new regulatory requirements or “safeguards”:
  1. Assessing risk of Legionella contamination and preparing a Risk Management Plan (RMP) (Approved Form 1) – every 5 years (or more frequently if required).
  2. Independently auditing compliance with the RMP and Regulation – annually.
  3. Providing certificates of RMP completion and audit completion to the local government authority.
  4. Sampling and testing for Legionella and heterotrophic colony count – monthly.
  5. Notifying reportable laboratory test results (Legionella count ≥1,000 cfu/mL or heterotrophic colony count ≥5,000,000 cfu/mL) to the local government authority within 24 hours of receiving the result from laboratory.
  6. Displaying unique identification numbers issued by the local government authority on all cooling towers.

Who can the occupier engage to help fulfil their responsibilities?

The occupier may engage industry-based contractors to meet their responsibilities such as:
  • Duly qualified person to manage the cooling water system on a routine basis.
  • Competent person to conduct a risk assessment and develop an RMP.
  • Independent auditor to audit compliance with the RMP and Regulation.
The occupier may carry out the roles of duly qualified person and competent person if they meet the legal definitions in the Act and Regulation.
The occupier cannot audit their own system.

What issues must be notified to the local government authority?

The local government authority should be notified of the following:
  • Installation of a system, by completing the notification of installation or change in particulars form (Approved Form 6) – within 1 month.
  • Completion of an RMP, by providing a certificate of RMP completion contained in the Risk Management Plan (Approved Form 1) – within 7 days.
  • Completion of an audit, by providing a certificate of audit completion contained in the audit report (Approved Form 2) – within 7 days.
  • Notification of a reportable test result to local government authority, by completing the notification of reportable test results form (Approved Form 4) – within 24 hours.
  • A change in occupier, by completing the notification of installation or change in particulars form (Approved Form 6) – within 1 month.
  • Any change in particulars, e.g. decommissioning, by completing the notification of installation or change in particulars form (Approved Form 6) – within 7 days.

How should unique identification numbers be displayed?

The unique identification number must be displayed on a sign on the cooling tower within 30 days of being issued by the local government authority.
The sign must be at least A5 size, clearly visible to a person examining or inspecting the cooling water system and made of a durable material.

What is the local government authority for my area?

You can find your local government authority by entering the address of the cooling water system at Find my council.

What guidance and training is available?

The NSW Guidelines for Legionella Control in Cooling Water Systems explain the new requirements in detail, including the responsibilities of the occupier.
This series of factsheets summarises the key information for each stakeholder. The full set of factsheets can be found on the NSW Health website.
NSW Health has developed the Legionella Control in Cooling Water Systems training program together with TAFE NSW. Occupiers are encouraged to complete this training.

For more information

Current as at: Thursday 1 September 2022
Contact page owner: Environmental Health