Water Main Connection — Safe Work Method Statement
Safe Work Method Statement for connecting to water authority mains including tapping, valve installation, service connection, pressure testing, and backfill, performed in accordance with relevant water authority requirements and AS/NZS 3500.
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Water main connection work — tapping into pressurised water distribution mains, installing service connections, and associated valve and meter installation — is regulated by both the WHS framework and the technical requirements of the relevant water authority. Work on or near pressurised water mains must be performed by a licensed plumber authorised to perform water authority works in the relevant jurisdiction, and must comply with the applicable water authority's specification documents in addition to AS/NZS 3500.1 (Water services).
Water main connections typically involve excavation to expose the main, which is HRCW under the model WHS Regulations wherever the trench exceeds 1.5 m depth. Dial Before You Dig (1100) must be consulted and service plans obtained before any excavation commences. Live water mains operate at pressures typically between 300–800 kPa; a pressurised main failure during tapping can injure workers and flood the excavation rapidly. Where main isolation is not possible and a live main tap is required, specialist pressure tapping equipment and trained operatives must be used.
Notification to the relevant water authority is mandatory before commencing connections to the distribution network. In most states, a Notice of Works or equivalent must be submitted and approved before work begins, and the authority may require its own inspector to be present during the connection. Water sampling and disinfection procedures — typically chlorination and flushing per AS/NZS 3500 and the water authority's requirements — must be performed before the new connection is commissioned for potable water supply. Contamination of the drinking water network during connection is a public health risk requiring immediate notification.
Traffic management controls are required for water main connections in road reserves — a Traffic Management Plan approved by the relevant road authority must be in place before excavation in a roadway or footpath commences.
Customise this template with the water authority notification reference, the main diameter and operating pressure, the trench design and shoring details, and the disinfection procedure. This SWMS applies in all Australian states and territories.
Personal Protective Equipment
High Risk Construction Work Types
- •Excavation to a depth of more than 1.5 metres
- •Work near energised underground services
Risk Assessment
1.Underground Service Location and Excavation
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Striking live underground services (electricity, gas, telecommunications) | Catastrophic | Before any excavation, obtain a Dial Before You Dig (DBYD) response and review all service plans. Engage a cable and pipe locator operator to scan the excavation area with electromagnetic detection and GPR equipment. Mark all detected services on the ground surface with paint. Hand-dig (or use vacuum/hydrovac excavation) within 300 mm of marked services until each service is physically identified and visually confirmed. No mechanical excavation within 300 mm of a confirmed service line. | Moderate | Licensed Plumber / Excavation Supervisor |
| Trench wall collapse in loose or saturated ground | Catastrophic | For trenches deeper than 1.5 m, engage a geotechnical engineer to assess soil conditions and specify battering or shoring. Install trench boxes or sheet piling as directed before workers enter. Inspect trench walls each morning and after any rainfall — de-water standing water before entry. No workers below ground in unsupported trenches deeper than 1.5 m. Excavated spoil must be placed at least 1 m from the trench edge. | Moderate | Excavation Supervisor / Geotechnical Engineer |
2.Water Main Isolation and Dewatering
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Uncontrolled high-pressure water release during tapping or valve installation | High | Contact the water authority to confirm main pressure at the connection point and arrange main isolation where possible. Use a water authority-approved tapping machine with pressure-rated saddle for live tapping. All workers to stand back from the tapping machine during initial cut-in, with the operator protected by the machine body. Have a standby pipe plug kit on site during all live main work. Check all tapping machine seals before use. | Moderate | Licensed Plumber / Water Authority Representative |
3.Service Pipe Installation
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Cross-contamination of potable water from contact with soil or contaminants | High | Keep pipe ends capped at all times during installation. Clean all pipe joints with clean water before assembly. Ensure minimum separations from sewer and drainage pipes are maintained per AS/NZS 3500.1 (minimum 300 mm horizontal, 150 mm vertical separation). After installation, disinfect the new service per AS/NZS 4020 using approved chlorination method before connecting to potable supply. Record chlorination concentrations and contact times on the works record. | Low | Licensed Plumber |
4.Pressure Testing
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Joint failure under test pressure causing flooding of excavation | Moderate | Pressurise in stages (25%, 50%, 100% of test pressure) with a 5-minute hold at each stage before proceeding. All workers must stand clear of joints during pressurisation. Inspect all joints visually during each hold period. If flooding of the trench begins during testing, depressurise immediately. Do not enter a flooded trench. Pump out water and reassess ground stability before allowing workers back into the trench. | Low | Licensed Plumber |
5.Backfill and Reinstatement
| Hazard / Risk | Initial Risk | Control Measures | Residual Risk | Responsibility |
|---|---|---|---|---|
| Pipe damage from mechanical compactor over newly installed service | Moderate | Place a minimum 200 mm layer of clean sand or approved bedding material over the pipe and compact by hand for the first 300 mm of cover above the pipe crown. Plate compactor may be used only after a minimum 300 mm of cover is achieved above the pipe. Maximum compactor plate size and pass speed must be consistent with pipe manufacturer's installation instructions. Layer backfill in maximum 200 mm lifts and compact to specified density. Mark service with a warning tape 300 mm above the pipe before placing topsoil or pavement reinstatement. | Low | Licensed Plumber / Site Supervisor |
Relevant Codes of Practice
Worker Acknowledgement
By signing below, I confirm that I have read, understood and agree to comply with this Safe Work Method Statement.