Technical notes on plumbing industry topics are issued to assist licensed plumbers to comply with the Regulations applicable to water supply, sanitary and drainage plumbing work in Western Australia.
Each technical note is to be read in conjunction with Part 6 of the Regulations that currently adopt the Plumbing Code of Australia as the plumbing standards with the deemed-to-satisfy Plumbing and Drainage Standard AS/NZS 3500:2025 modified in certain matters to suit the State's building approach and other local conditions.
Current technical notes
Cold water services
Flexible spray hoses (v4 May 2026)
Braided flexible hoses (v5 May 2026)
Pipe sizing and commissioning (v4 May 2023) - under review
Disinfection of storage tanks and water services (v2 May 2023) - under review
Bidet douche seats and toilets (May 2026)
Heated water services
Water heater installations (v6 May 2026)
Plastic pipes to solar water heaters (v4 May 2026)
Heated water pipework (v4 May 2026)
Flow and return lines from solar water heaters (v4 May 2026)
Water heaters and water tanks in roof spaces (v4 May 2026)
Sanitary plumbing
Trade waste applications (v5 May 2026)
Above-ground pipework using drainage principles (v3 May 2026)
Connection of condensate waste to sanitary plumbing and drainage systems (v4 May 2023) - under review
Air admittance valves (AAV) (v5 July 2023) - under review
Reduced velocity aerator stack systems (v2 May 2023) - under review
Drainage plumbing
Boundary traps (v6 May 2026)
Vacuum sewers (v4 May 2026)
Multi-unit developments (v6 May 2026)
Overflow relief gullies and reflux valves (v5 May 2026)
Inspection openings for drainage (v3 May 2023) - under review
Inspection shaft, gully and trap risers (v3 July 2023) - under review
Miscellaneous technical notes
Miscellaneous technical note A – Water services providers conditions of connection; reticulation cut-ins; solvent welded traps; bin wash areas (v3 May 2023) - under review
Miscellaneous technical note B (v4 May 2026)
Specific topics
Support and fixing of pipework (v4 July 2026)
Plumbing Code of Australia (v4 May 2026)
Evaporative air conditioners, waste water drains and water supply (v4 May 2026)
Services to survey strata lots (v4 September 2023) - under review
Pumping apparatus and venting (v4 May 2026)
Accessible sanitary facilities (v6 May 2023) - under review
Junctions in plumbing systems (May 2026)
Each technical note is distributed to all licensed plumbers with a current email address.
Technical Advice Line
Any questions regarding technical notes can be directed to:
- 1300 360 897
- plumbers.admin@lgirs.wa.gov.au
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