Health (Air-handling and Water Systems) Regulations 1994

The core concept is the adoption of a voluntary industry standard as mandatory law. AS 3666 is a three-part standard dealing with design/installation (Part 1), operation/maintenance (Part 2), and performance-based maintenance of cooling water systems (Part 3). The regulation does not reproduce those standards; it incorporates them by reference. This means duty holders must purchase the standards from Standards Australia to know their obligations, creating a cost barrier to understanding the law.

"Air-handling system" is defined by reference to AS 3666 but expressly excludes "a dry system which does not use water or other liquids to operate, humidify, clean, maintain, heat or cool the air" (reg 3(1)). This carve-out makes sense given the microbial control purpose: dry systems present less risk of pathogen proliferation. However, the line between wet and dry can blur in practice, and the regulation provides no guidance for borderline cases.

"Cooling tower" is defined more broadly than AS 3666: it "also means any other liquid cooled heat rejection or liquid cooling equipment" (reg 3(1)). That extension captures evaporative condensers, closed-circuit cooling towers, and possibly chilled beam systems, depending on interpretation. The regulation gives no list of excluded equipment.

"Water system" means "a piped water system within a building designed to deliver water to outlet points" (reg 3(1)). This is narrower than AS 3666's scope, which covers all water systems in buildings. The regulation thus applies to the piping network but not to point-of-use appliances like taps or showers themselves, though AS 3666 may cover those separately.

The three-tier penalty structure (reg 16(2)(a)) reflects the era of 1994: first offence minimum $100, second $200, third or subsequent $500, with a maximum of $1,000. Continuing offences carry a daily penalty between $50 and $100. These amounts are not indexed to inflation. In 2025 terms, a $1,000 maximum fine for a commercial building operator who neglects maintenance is trivial relative to the cost of compliance, reducing the economic disincentive to cut corners.

The concept of "serious risk to health" underpinning the closure power (regs 12, 13) is undefined. It could encompass Legionella contamination, mould growth, chemical exposure, or any condition the decision-maker considers meets the threshold. The regulation provides no objective criteria, testing protocols, or evidentiary requirements before a closure direction is issued. This grants the local government and CHO wide discretion, which may be exercised inconsistently across the 137 local governments in WA.

The exemption mechanism under reg 6 is conditional on both local government and CHO approval. The applicant must "satisfy" the local government that the non-compliant system is "satisfactory" , a double subjective test. The CHO may impose any conditions and revoke the exemption without cause. This creates no vested right in the exemption and exposes operators to sudden changes in regulatory status.

"Substantially modify" in reg 7(1) is not defined. Minor repairs likely fall outside the approval requirement, but the regulator could interpret replacement of major components as a substantial modification, catching operators unaware.

The primary duty holders are the owners and occupiers of buildings that fall within scope. The regulation applies to all buildings except those classified as Class 1, Class 2 or Class 10 under the Building Regulations 2012 (reg 4(2)). In practice, this means commercial office buildings, retail premises, hospitals, schools, hotels, industrial facilities, public buildings, and any other non-residential or mixed-use building not caught by the exclusion. The exclusion of Class 2 (apartments) is notable because many apartment buildings have central air-handling and cooling systems. Those systems would be regulated only if the building classification is something other than Class 2 , for example, a mixed-use building with ground-floor retail may fall within scope for the common areas.

Local governments are deeply involved. They receive and approve design/installation applications (regs 7-8), they may grant exemptions subject to CHO approval (reg 6), they may order closure of a system (reg 12), and they approve discharge and waste systems under reg 10(1)(a). This imposes a compliance burden on local government staff who may lack engineering or public health expertise to evaluate AS 3666 compliance. The regulation does not require local governments to consult specialists, nor does it set time limits for processing applications, leaving operators at risk of delays in approvals.

The Chief Health Officer, a senior official within the Department of Health, has superseding powers: approving exemptions (reg 6), confirming or cancelling local government closure notices (reg 12(3)-(4)), issuing independent closure notices (reg 13), and directing re-opening (reg 14). The CHO's decisions are not subject to merits review under the regulation. Judicial review on administrative law grounds would require a separate application to the Supreme Court, which is impractical for a short-term closure dispute.

Designers, engineers, architects and installing contractors are affected indirectly: they must produce plans that comply with AS 3666 and submit them to the local government. The application for approval must be made by the person proposing to install or modify (reg 7(1)), who is usually the building owner or developer, but the contractor may be liable if they install without approval. The offence provision (reg 16(1)) applies to "a person" who contravenes any provision, so the contractor who installs without approval could be prosecuted jointly with the owner.

Maintenance contractors and building facilities managers are also caught. The duty under reg 9(1) to comply with AS 3666 operation and maintenance provisions applies to "a person to whom a provision of AS 3666 ... applies." That circular language likely includes anyone who physically maintains the system, such as HVAC contractors. A contractor who fails to clean a cooling tower according to AS 3666 schedules could be personally liable.

Tenants who occupy part of a building may be "occupiers" and thus bear duties under reg 10 (control of liquids and dust) and the closure regime. However, they may not have control over the central air-handling system. The regulation does not clarify how duties apportion between owner and occupier where the occupier lacks physical control over the system. This creates potential for disputes where a tenant receives a closure notice for a system managed by the landlord's contractor.

Duties

1. Pre-approval obligation: No person may install or substantially modify an air-handling system, water system or cooling tower without first applying to the local government and obtaining its written approval (reg 7(1)-(2)). This is a positive prior restraint on building services works.

2. Design compliance: The local government must not grant approval unless satisfied the design and installation information complies with applicable AS 3666 provisions (reg 8). This imposes a de facto duty on the applicant to ensure the design meets the standard, not merely to submit plans.

3. Operation and maintenance compliance: A person to whom an AS 3666 operation/maintenance provision applies must comply with that provision (reg 9(1)). The standard's requirements include regular inspection, cleaning, chemical treatment and record-keeping for cooling towers and air-handling systems. Compliance is mandatory regardless of whether the building has changed hands or the system is obsolete.

4. Control of liquids, dust and access: The owner or occupier must ensure that liquids discharged during operation or maintenance go to a local-government-approved sewer or waste system; that aerosols, dust or particulate matter do not contaminate adjoining areas; and that public access to contaminated areas is prohibited unless authorised (reg 10(1)). This imposes a strict duty with no fault element.

5. Prohibited materials duty: If the local government, with CHO approval, directs that a material must not be used in a system, any person who uses that material commits an offence (reg 11). The direction can be prospective only, but the regulation does not require the local government to prove the material is actually unsafe, only that they are "satisfied" it is or may be unsafe.

6. Closure compliance: A person served with a closure direction under Part 5 must give effect to the direction immediately (regs 12(5), 13(2)). Failure to close is an offence.

Rights

1. Right to apply for exemption: A person who wishes to install or modify a non-compliant system may apply for an exemption under reg 6(1). Similarly, a person who wishes to use a non-compliant maintenance system may apply under reg 6(2). The onus is on the applicant to satisfy the local government, and the CHO has the ultimate say.

2. Right to resume after unconfirmed closure: If a local government issues a closure notice but the CHO does not confirm it in writing within 48 hours, the notice expires and the system may resume operating (reg 12(3)). The operator does not need any formal direction to reopen; the expiry is automatic.

3. Right to re-opening direction: Once a closure has been confirmed or made by the CHO, the system must remain closed until either the local government (if it initially closed the system) or the CHO directs in writing that it may be re-opened (reg 14(1)). The duty holder has no right to apply for re-opening; they must wait for the regulator to act.

4. No right to be heard, no right of appeal: The regulation contains no express right for the owner, occupier or person in charge to make representations before a closure notice is issued, nor any right to seek review of a closure decision or a refusal of approval or exemption. The only avenue is an application for judicial review, which is not a merits review and is unlikely to be practical within 48 hours.

The absence of procedural fairness provisions is striking. Both reg 12 and reg 13 allow closure "forthwith" on the subjective satisfaction of the decision-maker. The operator may not even know why the system poses a risk, nor have an opportunity to rectify before the shutdown. This creates a strong incentive for operators to maintain meticulous records and proactive compliance to avoid attracting attention.

The penalty regime is an odd mix of fixed minimums and a low ceiling. Under reg 16(2), a person who commits an offence is liable to a penalty not more than $1,000 and not less than: $100 for a first offence, $200 for a second, $500 for a third or subsequent. If the offence is continuing, an additional daily penalty applies of not more than $100 and not less than $50. No provision exists for imprisonment, penalties indexation, or penalty units (which are used in other WA legislation). This means the maximum fine has not changed since 1994, and its real value has eroded to approximately $500 in 2023 terms when adjusted for CPI. For a commercial building operator with thousands of dollars at stake in maintenance costs, the maximum fine is economically trivial.

The offence provision (reg 16(1)) is a general clause: "A person who contravenes or fails to comply with any of the provisions of these regulations commits an offence." This captures every duty under the regulation, including non-compliance with AS 3666 (through reg 9(1)), failure to obtain approval (reg 7(2)), failure to control discharges (reg 10(2)), using prohibited materials (reg 11(2)), and failing to close a system when directed (regs 12(5), 13(2)). The same penalty applies regardless of the gravity of the breach.

The regulation does not specify whether the offence is one of strict liability or requires proof of mens rea. Given that it is a minor regulatory offence under health legislation, courts would likely treat it as strict liability, meaning the prosecution only needs to prove the act or omission, not intent. However, a defence of honest and reasonable mistake would be available at common law. The defendant bears the evidentiary burden of raising that defence.

Enforcement is primarily through local governments, which have the power to serve closure notices and presumably to initiate prosecutions. The CHO also has a direct enforcement role via closure and exemption decisions. There is no dedicated inspection or audit requirement in the regulation. Whether local governments conduct proactive inspections depends on their resources and priorities. The regulation does not create a licensing scheme, so there is no central register of systems or duty holders.

The practical deterrent effect of these penalties is weak. A building owner who fails to maintain a cooling tower, leading to a Legionella outbreak, faces a maximum $1,000 fine plus daily penalties. The civil liability for personal injury or death arising from the outbreak would be vastly higher, but that is a matter for tort law, not this regulation. The regulation's penalty structure was designed at a time when $1,000 was serious. It is now a rounding error for most commercial operators.

The closure power is the sharper tool. A closure direction can force an immediate shutdown of a building's HVAC system, potentially rendering the building uninhabitable or unusable. The economic consequences for the operator (lost rent, business interruption, emergency repair costs) far exceed any fine. This is where the regulation exerts real pressure on compliance. However, the closure powers are limited by the 48-hour expiry for local government notices unless the CHO confirms them, which may give the operator a tactical window.

The parent Act is the Health (Miscellaneous Provisions) Act 1911, which confers the power to make regulations on matters relating to public health. These regulations sit alongside other health regulations, such as those on sewage, infectious diseases, and food safety. They do not override the parent Act, and the general enforcement powers under the Act (e.g., authorised officers entering premises) would complement the specific closure powers here.

The Building Regulations 2012 define the building classes used to exclude certain buildings from scope (reg 4(2)). Any amendment to the building classification system could shift buildings in or out of scope. If a building is reclassified from Class 2 to Class 5 (e.g., an apartment building converted to offices), the systems would become regulated immediately, even if they were installed decades earlier under the higher-risk standard.

AS 3666 itself interacts with Australian Standards for other building services, such as the Plumbing Code (AS/NZS 3500) and the Building Code of Australia (now National Construction Code). Where AS 3666 says systems should be designed to minimise microbial growth, the detailed plumbing design might require backflow prevention devices or material specifications that are also mandated under other standards. The regulation does not resolve conflicts between standards; it only states that its own provisions prevail over AS 3666 (reg 5(2)), not over other laws.

The Work Health and Safety Act 2020 (WA) imposes a primary duty of care on persons conducting a business or undertaking (PCBUs) to ensure the health and safety of workers and others. A building owner or occupier who fails to maintain an air-handling system against bacterial contamination could be in breach of both these regulations and the WHS Act. The WHS Act carries much higher penalties (fines up to $650,000 for an individual, $3.5 million for a body corporate for Category 1 offences) and includes potential imprisonment. Compliance with the Health (Air-handling and Water Systems) Regulations would be relevant evidence of meeting the WHS duty, but not determinative. Conversely, a person who complies with the WHS Act but not these regulations could still be prosecuted under this regulation.

Environmental laws may also apply to the discharge of liquids into sewer or waste systems. Regulation 10(1)(a) requires discharges to go into a "sewer or other waste system approved by the local government and any other relevant authority." That other authority could be the Department of Water and Environmental Regulation under the Environmental Protection Act 1986 or the Water Services Act 2012. Discharge without appropriate approvals could trigger separate offences under those Acts.

The local government's role under reg 7 (approvals) may overlap with building approval processes under the Building Act 2011 or the Building Regulations. A developer may need both a building permit and an approval under these regulations for the same system. The regulations do not require integration or coordination between those approvals, creating the possibility of sequential bottlenecks.

Public health legislation in other states (e.g., Victoria's Public Health and Wellbeing Act 2008, NSW's Public Health Act 2010) have specific provisions for cooling tower registration and inspection. Western Australia does not have a separate registration system for cooling towers under these regulations. There is no requirement to register a system, only to obtain approval for new installations. This means there is no central inventory of systems, making it harder for regulators to conduct proactive risk assessment.

The original regulations were published in the Government Gazette on 24 June 1994 and commenced on 24 September 1994 (three months later, per reg 2). The first amendment occurred within the same year: the Health (Air-handling and Water Systems) Amendment Regulations 1994 (gazetted 16 September 1994) which commenced simultaneously. That amendment corrected or updated regulation 7(3) and (4), likely addressing the plan submission requirements for applications.

The most substantive amendment came in 2001 (Gazette 23 October 2001), which made changes to multiple provisions: reg 3 (interpretation) updated to reference the then-current AS 3666 editions , specifically AS/NZS 3666.1:1995 and AS/NZS 3666.2:1995, plus the 1996 amendments, and added Part 3 (AS/NZS 3666.3:2000). This amendment also modified reg 4 (application), reg 6 (exemptions), reg 7 (application for approval), reg 8 (design and installation), reg 10 (control of liquids and dust), reg 11 (unsuitable materials), reg 12 (local government closure), reg 13 (CHO closure), reg 14 (re-opening), and reg 15 (notice prevails). The breadth of changes indicates a thorough review, possibly in response to the 2001 amendments to the AS 3666 series.

The 2013 amendment (Gazette 30 July 2013) was narrower: it amended reg 4 to update the cross-reference from the former Building Regulations 1989 to the Building Regulations 2012, specifically regulation 6 of the 2012 regulations. This ensured the building classification exclusion remained current after the new building regulations replaced the old ones.

The final amendment was in 2017 as Part 8 of the Health Regulations Amendment (Public Health) Regulations 2016 (Gazette 10 January 2017, effective 24 January 2017). This amendment changed references from "Executive Director, Public Health" to "Chief Health Officer" across regs 3, 6, 11, 12, 13, 14, 15. This reflects a machinery-of-government reorganisation, not a substantive policy change.

The regulation has been reprinted once (Reprint 1 as at 29 August 2003). There have been no amendments since 2017. The compilation table shows that all amendments are included in the current version. The absence of recent amendments could indicate that the regulation works adequately in practice, or that it has become a lower priority for government amid other public health reforms. It also means the penalty amounts remain as set in 1994.

There is no reported or widely known litigation involving these specific regulations in the 30 years since they commenced. The source contains no reference to any cases, and independent searches of Western Australian courts and tribunals reveal no judgments that turn on the interpretation of the Health (Air-handling and Water Systems) Regulations 1994. This does not mean no prosecutions have occurred; it means none have resulted in a published decision that sets a precedent.

Several factors explain the absence of reported cases. First, the penalty maximum of $1,000 provides little incentive for a defendant to incur legal costs to contest a charge. Most prosecutions would be dealt with in the Magistrates Court with guilty pleas, generating no written reasons. Second, closure notices under Part 5 are likely resolved informally through rectification and re-opening, not through litigation. The 48-hour automatic expiry of local government notices under reg 12(3) creates a mechanism that resolves many disputes without court involvement. Third, the regulations are administrative and technical, leaving little room for interpretative disputes that would reach appellate level.

The lack of case law means there is no judicial guidance on several key terms: "serious risk to health" (regs 12, 13), "substantially modify" (reg 7(1)), and "satisfied that the air-handling system, water system or cooling tower is satisfactory" (reg 6). Duty holders and local governments must rely on the ordinary meaning of these words, which can lead to inconsistent application. A local government in one district might consider a risk serious where another would not.

The High Court of Australia and the WA Court of Appeal have considered related public health provisions in other contexts, such as the closure of premises under the Health Act 1911, but those cases interpret different statutory frameworks. They are not binding on the meaning of these regulations.

Legal practitioners advising clients on closure notices should note the absence of any right to seek review under the regulations. If a closure is challenged, the only avenue is an application to the Supreme Court for judicial review (e.g., certiorari to quash the decision) on grounds such as jurisdictional error, denial of procedural fairness, or unreasonableness. Such an application would need to be filed quickly, likely within days, but the practical obstacles (cost, time to get a hearing, the system being already shut down) are significant.

The lack of litigation history also means the regulation's interaction with the WHS Act, environmental laws and building laws has never been judicially tested. For example, whether compliance with AS 3666 constitutes a defence to a WHS prosecution, or whether a WHS inspector's improvement notice overlaps with a local government closure notice, remains unresolved.

1. Automatic incorporation of future AS 3666 amendments: Because reg 5 adopts the AS 3666 series as in force from time to time, any future revision by Standards Australia becomes law automatically. Duty holders must monitor standard updates or risk unknowingly breaching the regulation. The Department of Health does not issue an updated compilation when the standard changes.

2. No right to be heard before closure: Both reg 12 (local government) and reg 13 (CHO) allow closure "forthwith" on the decision-maker's subjective satisfaction. There is no requirement to give the owner or occupier advance notice, an opportunity to show cause, or a copy of any evidence relied upon. A system can be shut down with zero due process.

3. 48-hour window for local government closure: Regulation 12(3) says a local government closure notice expires after 48 hours unless the CHO confirms it in writing. However, the regulation does not require the CHO to acknowledge the notice within that period. If the CHO does nothing, the notice expires and the system can resume. But the operator must monitor the time and may be unsure whether the CHO will confirm late. The risk is that a late confirmation could create an arguable legal issue, but the operator would need to decide whether to restart the system at the 48-hour mark.

4. Broad definition of cooling tower: Regulation 3(1) extends the term to "any other liquid cooled heat rejection or liquid cooling equipment." This could cover chiller barrels, adiabatic coolers, or even HVAC units that reject heat through water-cooled condensers. Any device that uses water to dissipate heat may now be a cooling tower for regulatory purposes, even if it does not have an open evaporative section.

5. No grandfathering for legacy systems: Regulation 4(3) applies the regulations to systems installed before commencement. The design and installation duties (Part 3) apply only to systems installed after commencement (reg 4(4)), but the ongoing operation and maintenance duty under reg 9 applies to all systems regardless of age. An old cooling tower designed to outdated standards must still comply with current AS 3666 maintenance provisions unless an exemption is obtained.

6. Ambiguity over 'person in charge': The closure notices can be served on "the person in charge of" the system (regs 12(1)(b), 13(1)(b)). This is not defined. It could include the building manager, the HVAC contractor, or even a tenant who manages their own floor's air-handling unit. A person who did not install, own or operate the system could still be obliged to close it under penalty of prosecution.

7. No statutory timeframe for local government approval: Regulation 7 requires approval before installation or modification, but no time limit is imposed on the local government to decide. A developer could face indefinite delays waiting for a decision on plans, with no remedy under the regulation. The approval process can be used as a de facto hold-up.

8. Exemption uncertainty: Under reg 6, an exemption from AS 3666 compliance requires the applicant to satisfy the local government, then obtain CHO written approval. The CHO may impose conditions and may later amend or cancel the approval without cause (reg 6(3)). There is no hearing requirement before revocation. A business that invests in a non-standard system relying on an exemption could have it withdrawn overnight, leaving them in breach.

9. Offence for non-compliance with the whole regulation: Regulation 16(1) uses broad language: "contravenes or fails to comply with any of the provisions of these regulations." This includes not only the substantive duties (approval, maintenance, closure) but also any incidental requirements. If a regulator directs a person under reg 11 not to use a material, and the person uses it, that is an offence with no separate requirement to prove harm.

10. Low penalties may reduce incentives for voluntary compliance: With a maximum fine of $1,000 (and a minimum of $100 for a first offence), a cost-benefit analysis may favour non-compliance for some operators, especially if the cost of engaging a specialist to test and maintain a system is much higher. The risk of civil liability for disease outbreaks is the real deterrent, but that risk is diffused and distant compared to immediate cost savings.

11. No mandatory testing or record-keeping in the regulation: Unlike legislation in some other states (e.g., NSW Public Health Regulation 2022 requiring cooling tower operators to test for Legionella at specified intervals and keep records for 3 years), these WA regulations simply require compliance with AS 3666. The AS 3666 standard does include testing and record-keeping, but the regulation does not give them the force of prescribed requirements. A local government may not be able to prosecute for failure to keep records unless it can prove non-compliance with a specific AS 3666 clause.

12. Interaction with Work Health Safety officers: A WHS inspector could issue a prohibition notice for an unsafe air-handling system, overlapping with a local government closure notice. The two regimes operate independently. If both issue notices, the duty holder must comply with both. The CHO notice prevails over a local government notice (reg 15), but no provision addresses conflict between a CHO notice and a WHS notice.

Step 1: Determine if the building is within scope. Obtain the building's classification under the Building Regulations 2012, regulation 6. If the building is Class 1, 2 or 10, the regulations do not apply. For all other classes (e.g., Class 3 (boarding houses), 5 (offices), 6 (shops), 7 (storage), 8 (factories), 9 (public buildings)), the regulations apply to any air-handling system, water system or cooling tower in the building. Note that "building" is not defined in these regulations; rely on the Building Act 2011 definition.

Step 2: Identify all regulated systems present. Walk through the building and catalogue all air-handling units (including those that use water for heating, cooling, humidifying or cleaning), all water systems (piped systems delivering water to outlets, which includes potable water systems but likely excludes fire services), and all cooling towers (including any "liquid cooled heat rejection or liquid cooling equipment"). For each system, determine whether it is a "dry system" excluded from the air-handling system definition (no water or liquids used for any mentioned purpose). If in doubt, err on the side of inclusion.

Step 3: For new installations or substantial modifications, obtain local government approval. Submit an application under reg 7(1) before any work begins. For air-handling systems and cooling towers, the application must include a plan with details of type, design, layout, location, air inlet/exhaust locations including openable windows, prevailing wind and local wind patterns, other inlets/discharges that may affect or be affected, and position/type of any proposed developments in the vicinity that the local government has received notice of (reg 7(3)). For water systems, provide details of the type of system and design plans (reg 7(4)). Ensure the design complies with AS 3666 Part 1 (design and installation), as the local government is prohibited from approving non-compliant designs (reg 8). Engage a professional engineer familiar with AS 3666 to prepare the plans.

Step 4: If the system cannot comply with AS 3666, apply for an exemption under reg 6. First, satisfy the local government that the system is satisfactory for the purposes of the regulations. Then obtain the Chief Health Officer's written approval. The application should explain why strict compliance is not possible and propose alternative measures that achieve equivalent microbial control. Accept that the CHO may impose conditions and may later amend or cancel the exemption. Keep the approval documentation on file.

Step 5: Implement and maintain an operation and maintenance program that meets AS 3666 Part 2 (for all systems) and Part 3 (for cooling water systems). This includes regular inspections, cleaning, chemical dosing, water testing for microbial contamination, and record-keeping. The regulation does not prescribe frequencies; refer to the standard. Engage a licensed or competent contractor to perform the work. Since reg 9(1) imposes a direct legal obligation to comply with AS 3666, the building owner or occupier should require the contractor to provide reports and test results. Retain all maintenance logs, water test results, and inspection certificates for at least the period specified in AS 3666 (likely several years). In the event of a dispute or investigation, these records are the primary evidence of compliance.

Step 6: Control discharges, aerosols and dust. Ensure any liquids discharged during operation or maintenance are directed to a sewer or waste system approved by the local government and any other relevant authority (reg 10(1)(a)). This may require obtaining a trade waste permit from the water corporation if chemical treatments are used. Ensure that aerosols, dust or particulate matter generated during operation or maintenance do not contaminate adjoining areas or the ambient environment (reg 10(1)(b)). Use containment methods such as wetting, local exhaust ventilation or physical barriers. Prohibit public access to any area where contamination may occur, unless you authorise it (reg 10(1)(c)). Post signage and enforce access control.

Step 7: Respond immediately to any closure notice. If served with a closure direction under reg 12 (local government) or reg 13 (CHO), shut down the system forthwith. Seek legal advice immediately. If the notice is from the local government, note that it expires in 48 hours unless the CHO confirms it in writing. Attempt to determine the reason for the closure and rectify the issue (e.g., disinfect the cooling tower, repair a leak, clean ductwork). Contact the local government and CHO to negotiate a re-opening direction. Do not resume operation unless the local government (if they issued the closure) or the CHO directs in writing (reg 14(1)), or unless the 48-hour period expires without CHO confirmation (reg 14(2)).

Step 8: Monitor AS 3666 changes and legal developments. Since the regulation adopts the standard by reference, check Standards Australia's website annually for new editions of AS 3666.1, AS 3666.2 and AS 3666.3. When a new edition is published, review the changes and update your maintenance program accordingly. Also monitor the Government Gazette for any amendments to the regulations themselves.

Step 9: Consider voluntary registration or audit. Although the regulation does not require registration, some local governments may maintain their own databases of cooling towers. For larger facilities, engage an independent auditor to verify compliance with AS 3666 and the regulations every few years. This can reduce the risk of being caught by surprise by a closure notice.

Step 10: Cost the compliance burden. The cost of compliance , engineering design, regular maintenance, water treatment, testing, record-keeping, and potential consultant fees , should be budgeted as a recurring operational expense. For cooling towers, water treatment chemicals and Legionella testing alone can cost thousands per year. Weigh these costs against the trivial maximum fine; the real risk is business interruption from a closure. Treat compliance as business continuity insurance, not merely a legal obligation.