Leak Detection (Acoustic / Tracer Gas / Thermal) SWMS
A Safe Work Method Statement for leak detection covering all key hazards, controls and regulatory requirements.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Leak detection work using acoustic listening devices, tracer gas (typically hydrogen/nitrogen blends), and thermal imaging is a specialised plumbing activity carried out across residential, commercial, and industrial sites to locate concealed leaks in pressurised water lines, gas services, and below-slab pipework. The work commonly involves accessing confined service ducts, working in occupied buildings, handling compressed gas cylinders, operating sensitive electronic equipment near energised services, and interpreting data to make decisions that affect property and worker safety.
Under the model Work Health and Safety Act 2011 and WHS Regulation 2025, Part 3.1 — Managing Risks to Health and Safety, a Person Conducting a Business or Undertaking (PCBU) must identify reasonably foreseeable hazards, eliminate risks so far as is reasonably practicable, and where elimination is not possible, minimise risks by applying the hierarchy of controls under Regulation 36. Plumbers performing leak detection are also captured by the Plumbing Code of Australia and AS/NZS 3500 series obligations.
A documented SWMS is legally required where the work meets the definition of High Risk Construction Work under Regulation 291, and is strongly recommended as a risk management record for all leak detection activities. This SWMS provides a defensible, site-ready document that demonstrates consultation under s.47 of the WHS Act and discharge of the primary duty of care under s.19.
Hazards identified
10 hazards covered, sorted by priority.
Loss of consciousness, oxygen displacement below 19.5%, fatality
Projectile injury, flash fire (hydrogen LEL 4%), pressure injury
Electric shock, electrocution, arc flash burns
Noise-induced hearing loss exceeding 85 dB(A) LAeq,8h exposure standard
Sprains, fractures, head injury
Musculoskeletal injury, back strain, crush injury from dropped cylinder
Respiratory illness, gastroenteritis, dermatitis, Legionella exposure
First and second-degree thermal burns
Asphyxiation, entrapment, exposure to atmospheric contaminants
Visual fatigue, collision with obstacles, falls from same level
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Conduct a documented pre-start risk assessment at each site and review the SWMS with all workers before commencing — record sign-on against the worker register
- 2Before introducing tracer gas, isolate the section of pipework, verify ventilation, and continuously monitor atmosphere with a calibrated 4-gas detector (O2, LEL, CO, H2S) where workers may enter the space
- 3Use only certified hydrogen/nitrogen tracer gas blends below the lower flammability limit (typically 5% H2 / 95% N2) and store cylinders upright, restrained, and segregated per AS 4332
- 4Identify and isolate electrical services using current drawings and a calibrated cable locator before any percussion, drilling, or probe insertion — comply with AS/NZS 4836 for low-voltage work
- 5Issue and wear Class 5 SLC80 hearing protection when using acoustic amplifiers above 85 dB(A); rotate workers to limit exposure under WHS Regulation Chapter 4 Part 4.1
- 6Treat all sub-floor spaces, pits, and ducts as potential confined spaces — apply Regulation 67 confined space entry permit requirements and follow AS 2865 where applicable
- 7Provide P2/N95 respirators, nitrile gloves, and disposable coveralls when investigating sewage or suspected mould-affected leaks; decontaminate equipment between sites
- 8Allow hot water and heated surfaces to cool, or use insulated barriers, before placing thermal probes or contact sensors; wear heat-resistant gloves rated to EN 407
- 9Establish exclusion zones around the work area using barriers and signage to prevent occupant interference, particularly in retail and healthcare environments
- 10Maintain three points of contact when traversing wet floors and use task lighting (minimum 160 lux) in sub-floor and roof-space environments
- 11Inspect, tag and test all electrical detection equipment in accordance with AS/NZS 3760 before use; do not operate damaged leads or housings
- 12Implement an emergency response procedure including gas cylinder shut-off, evacuation routes, and communication checks every 15 minutes for lone workers
Applicable Codes of Practice
Establishes the risk management process required under WHS Regulation Part 3.1 that underpins this SWMS
Applies when leak detection is performed in sub-floor cavities, pits, plant rooms, or service ducts that meet the confined space definition
Governs exposure to acoustic amplification equipment and the 85 dB(A) exposure standard under Regulation 56
Covers lighting, ventilation, and access requirements at leak detection sites
Technical standard for water service isolation, testing, and reinstatement during leak detection
Technical standard referenced for atmospheric testing, entry permits, and rescue arrangements
Mandatory test-and-tag standard for portable detection instruments and extension leads
Governs transport, storage, and use of tracer gas cylinders on site
Who this is for
- →Licensed plumbers and plumbing contractors offering specialised leak detection services
- →Property maintenance and facility management contractors performing investigative plumbing work
- →Insurance assessors and make-safe contractors responding to water damage claims
- →Hydronic heating and slab leak specialists using thermal imaging technology
- →Commercial plumbing businesses tendering for healthcare, retail, and government contracts requiring documented SWMS
- →Sole-trader plumbers required to demonstrate WHS compliance to principal contractors
What you receive
- ✓Fully editable Microsoft Word (DOCX) SWMS template, pre-populated and ready for site customisation
- ✓State-specific legislation schedule covering NSW, VIC, QLD, WA, SA, TAS, ACT and NT WHS jurisdictions
- ✓Comprehensive hazard register with risk matrix scoring (likelihood x consequence)
- ✓Worker sign-on register with consultation acknowledgement under s.47 of the WHS Act
- ✓Pre-start checklist for daily site verification of controls
- ✓Emergency response and incident notification procedure aligned with WHS Act s.38
- ✓Reference list of applicable Codes of Practice and Australian Standards
- ✓Free minor revisions for 12 months as legislation updates
Worked example
A licensed plumber is engaged to locate a concealed leak under the polished concrete slab of an occupied two-storey office in Parramatta. On arrival, the plumber reviews this SWMS with their offsider, signs the worker register, and conducts a pre-start walk-through. They identify the meter pit as a confined space, isolate the building water supply, and pressurise the line with a 5% hydrogen / 95% nitrogen tracer mix from a restrained cylinder stored outside the building. Before drilling a 6 mm pilot hole through skirting to insert the acoustic probe, the plumber uses a cable locator to confirm no electrical services are concealed in the wall cavity, dons Class 5 hearing protection, and establishes a 2-metre exclusion zone with bollards. The thermal camera identifies a warm anomaly consistent with a hot water return line; the hydrogen sensor confirms the leak point within 200 mm. The work is documented, the area decontaminated, and the SWMS retained on file for the duration of the work plus two years as required under Regulation 300.
Related legislation
- Work Health and Safety Act 2011 (Model)
- Work Health and Safety Regulation 2025 — Part 3.1 Managing Risks to Health and Safety
- Work Health and Safety Regulation 2025 — Part 4.3 Confined Spaces
- Work Health and Safety Regulation 2025 — Chapter 7 Hazardous Chemicals
- Plumbing and Drainage Act 2011 (state equivalents)
- Electricity (Consumer Safety) Act 2004 and state equivalents
- Dangerous Goods (Storage and Handling) Regulations (state-based)
Frequently asked questions
Is a SWMS legally required for leak detection work?
A SWMS is mandatory under WHS Regulation 299 only when the work meets the definition of High Risk Construction Work under Regulation 291. Routine leak detection in occupied buildings typically does not trigger HRCW; however, where the work involves confined space entry, work near energised electrical services, or work at heights over 2 metres, a SWMS becomes mandatory. Even where not mandatory, this SWMS satisfies the PCBU's risk management duty under Regulation 36 and is commonly required by principal contractors and insurers.
Does this SWMS cover the use of hydrogen tracer gas?
Yes. The SWMS specifically addresses the controls required for handling 5% hydrogen / 95% nitrogen tracer blends, including cylinder storage under AS 4332, atmospheric monitoring with calibrated 4-gas detectors, and ignition source elimination. The blend is below the lower flammability limit (4% H2 in air) but PCBUs must still manage it as a hazardous chemical under Chapter 7 of the WHS Regulation.
Can I use this SWMS in every Australian state and territory?
Yes. The SWMS is built on the model WHS Act and Regulation framework adopted by NSW, QLD, ACT, NT, SA, TAS, and WA. A Victoria-specific schedule is included to address the OHS Act 2004 and OHS Regulations 2017 equivalents. The state legislation schedule in your purchase identifies the regulator and any jurisdictional variations.
How often does the SWMS need to be reviewed?
Under WHS Regulation 300, a SWMS must be reviewed and revised if a control measure is revised, a notifiable incident occurs, a new hazard is identified, or a worker raises a concern. Best practice is to review at least annually or at the start of each new project. The document must be retained for the duration of the work, and for at least two years following a notifiable incident.
Does the SWMS need to be signed by every worker?
Yes. Section 47 of the WHS Act requires consultation with workers, and the SWMS must demonstrate that each worker performing the task has been inducted into its content. The worker sign-on register included with this purchase satisfies that obligation and is the document regulators will request during a site audit.