Plumbing advisory notes
The Office of the Technical Regulator (OTR) produces advisory notes to help people working in the plumbing industry interpret the requirements for on-site plumbing installations regulated under the Water Industry Act 2012.
Backflow prevention requirements for chemical dispensers - issued February 2021
Specific requirements exist for the installation of chemical dispensers to prevent hazardous backflow.
Backflow prevention requirements for chemical dispensers (PDF File 338.0 KB)
Backflow prevention requirements for external hose taps - issued February 2022
This plumbing note discusses the legislative requirements for the minimum backflow on external hose taps.
Backflow prevention requirements for external hose taps (PDF File 98.9 KB)
Backflow prevention requirements for trade waste - issued March 2019
Trade waste installations require the installation of appropriate backflow prevention devices.
Backflow prevention requirements for trade waste (PDF File 94.6 KB)
Bath waste connections - issued April 2016
This advisory note is to address complaints made to the OTR from both the building industry and property owners about non-compliant plumbing bath waste connections installed in wet areas where there is no floor waste gully.
Bath waste connections (PDF File 385.7 KB)
Bedding and backfilling drains - issued August 2014
Plumbing contractors undertaking sanitary drainage installations need to ensure that pipework is properly supported and bedded to avoid damaging the drainage materials. This advisory note details the requirements plumbers must follow when bedding and back-filling drains.
Bedding and backfilling drains (PDF File 105.2 KB)
Booking a plumbing inspection - issued May 2019
The process for booking a plumbing inspection has changed. The new process uses eCoC and allows plumbers to better manage their bookings.
Booking a plumbing inspection (PDF File 124.2 KB)
Categories for audit bookings - issued June 2022
Licensed plumbers in South Australia booking a plumbing and drainage audit with the OTR must identify the job type and category of the installation when making the booking.
Categories for audit bookings (PDF File 65.1 KB)
Changes to plumbing audit notifications - issued July 2019
From 31 July 2019, the OTR will no longer provide details of plumbing bookings by SMS.
Changes to plumbing audit notifications (PDF File 59.0 KB)
Common drains - issued August 2014
A common drain is a sanitary drain which transports on-site sewage from two or more Torrens title allotments into the sewerage infrastructure through a single connection point. This advisory note explains what a common drain is and how home owners may become aware of having one.
Common drains (PDF File 263.5 KB)
Connecting water services to dental chairs - issued November 2021
Plumbers need to be aware of these requirements when installing pipework and backflow prevention devices associated with dental chairs.
Connecting water services to dental chairs (PDF File 293.1 KB)
DN100 Equal junctions - issued July 2022
There are new changes impacting how DN100 junctions are installed. In most cases, plumbers can no longer install a DN100 equal junction on grade in Sanitary Plumbing or Sanitary drainage systems.
DN100 Equal junctions (PDF File 297.3 KB)
Fees for reinspecting or reattending - issued January 2019
The OTR charges a $98 fee for on-site plumbing work re-inspections. This advisory note details when plumbers need to pay the fee and how to pay it.
Fees for reinspecting or reattending (PDF File 42.1 KB)
Final audits on-site - issued December 2016
The OTR conducts final audits of on-site plumbing installations to make sure they comply with the plumbing standard published under section 66 of the Water Industry Act 2012.
Final audits on-site (PDF File 44.1 KB)
Fire hydrant and fire hose reel services - issued August 2018
All new fire services and alterations to existing fire service installations must be booked with the OTR and are subject to auditing.
Fire hydrant and fire hose reel services (PDF File 289.3 KB)
Fire service installation audit - issued August 2014
The OTR audits fire service installations to ensure they comply with relevant standards. This advisory note details the processes plumbing contractors must follow when installing fire services, whether or not OTR inspectors attend onsite.
Fire service installation audit (PDF File 79.7 KB)
Fire sprinkler systems - issued July 2020
This advisory note outlines the requirements for the installation of fire sprinkler systems.
Fire sprinkler systems (PDF File 144.8 KB)
Floor waste gully outlet sizing - issued July 2019
Floor waste gullies and shower outlets must be sized correctly to the fixture unit load.
Floor waste gully outlet sizing (PDF File 109.5 KB)
Heated water services standards update - issued May 2016
Plumbers need to be aware that significant changes have been made to AS/NZS 3500.4:2015, which sets out the requirements for designing, installing and commissioning heated water services. In particular, the changes relate to velocity requirements and to solar water heaters.
Heated water services standards update (PDF File 575.8 KB)
Heated water temperature control - issued April 2022
Important information on the safe supply of heated water to plumbing fixture outlets used primarily for personal hygiene
Heated water temperature control (PDF File 754.0 KB)
Hydraulic design submissions - issued October 2020
Hydraulic designs for plumbing and drainage pipe work and equipment, previously referred to as building plan applications, must be lodged with the OTR. This advisory note details the type of installations and how to lodge plans.
Hydraulic design submissions (PDF File 46.7 KB)
Inspection and testing openings in multi-storey sanitary plumbing systems - issued October 2017
To allow sanitary plumbing systems to be cleaned, tested and maintained, stacks and common discharge pipes must have accessible inspection openings.
Inspection and testing openings in multi-storey sanitary plumbing systems (PDF File 233.0 KB)
Interactive water features - issued August 2020
Requirements exist which are specific to the installation of Interactive Water Features (such as water play, splash parks or splash pads) as found in many parks and playgrounds across South Australia
Interactive water features (PDF File 316.5 KB)
Legionella risk management - issued April 2016
Legionellosis is a potentially fatal disease caused by the bacteria Legionella. While there is risk associated with Legionella in any water system, those that distribute warm water pose a greater risk.
Legionella risk management (PDF File 304.9 KB)
Non-drinking recycled water - issued (Revised) July 2022
The National Construction Code sets out the requirements for design, construction, installation, replacement, repair, alteration and maintenance of any part of a non-drinking water service (recycled water).
Non-drinking recycled water (PDF File 413.4 KB)
Plastic pipes used in association with solar water heaters - issued July 2014
This advisory note details the limitations on using plastic pipes, particularly for solar hot water systems.
Plastic pipes used in association with solar water heaters (PDF File 563.7 KB)
Plumbing certificates of compliance - issued June 2018
Plumbers must issue certificates of compliance to verify that plumbing and equipment is safe to use and complies with the necessary regulations and standards.
Plumbing certificates of compliance (PDF File 188.6 KB)
Pumped discharges or rising mains - issued August 2014
The OTR only permits use of discharge pumps or rising mains when it is not practicable to gravitate to a sewer connection. This advisory notes details the necessary installation requirements.
Pumped discharges or rising mains (PDF File 310.4 KB)
Renovation of sanitary plumbing and drainage pipework - issued June 2018
Renovations to existing sanitary plumbing and drainage pipework using the Cured in Place Pipe (CIPP) technique must ensure compliance with the National Construction Code Volume Three (Plumbing Code of Australia).
Renovation of sanitary plumbing and drainage pipework (PDF File 190.7 KB)
Small bore wastewater and macerator pump installations - issued April 2018
Plumbers need to be aware of these requirements when installing aboveground small bore wastewater and macerator pumps that receive discharge from one or more waste fixtures and/or a water closet.
Small bore wastewater and macerator pump installations (PDF File 199.5 KB)
Solar water heater small scale technology certificate (STC) requirements - issued June 2019
Solar water heaters are must meet minimum performance requirements to be eligible for Small-scale Technology Certificates (STCs)
Solar water heater small scale technology certificate (STC) requirements (PDF File 45.2 KB)
Supporting in-ground sanitary plumbing and drainage pipework - issued October 2016
This advisory note clarifies the support needed for in-ground sanitary plumbing and drainage pipework.
Supporting in-ground sanitary plumbing and drainage pipework (PDF File 206.4 KB)
Temporary on-site facilities - issued August 2020
Plumbing associated with temporary on-site facilities must meet all relevant technical and safety requirements.
Temporary on-site facilities (PDF File 69.7 KB)
Thermal expansion in above ground PVC-U pipelines - issued July 2014
When installing above-ground PVC-U pipe systems, plumbers need to take into account potential pipe expansion. When exposed to temperatures higher than 25 degrees Celsius, PVC-U pipe expands 10mm in length along a six metre length of pipe.
Thermal expansion in above ground PVC-U pipelines (PDF File 578.0 KB)
Thermal insulation for heated water services - issued July 2014
This advisory note details the requirements for installing thermal insulation on heated water service piping in different climate regions of South Australia.
Thermal insulation for heated water services (PDF File 70.6 KB)
Toilet seat douche outlets - issued April 2016
The OTR has identified a number of issues with toilet seat douche and flexible hose installations that do not comply with relevant plumbing standards.
Toilet seat douche outlets (PDF File 681.4 KB)
Trade waste - issued June 2021
Requirements exist which are specific to the connection of trade waste pre-treatment devices connected to the sanitary drainage system.
Trade waste (PDF File 615.3 KB)
Tundish connections - issued October 2019
Specific requirements exist for the installation of tundishes to be compliant with the performance requirements of the National Construction Code Volume 3, Plumbing Code of Australia (PCA).
Tundish connections (PDF File 309.1 KB)
Water heater requirements fact sheet - issued January 2014
South Australia has water heater requirements that may affect the type of water heater you can install in a home and the water efficiency of showers serviced by the water heater. This advisory note helps you understand which water heater you can install in different circumstances.
Water heater requirements fact sheet (PDF File 125.2 KB)
Water services for island benches - issued April 2020
Requirements exist which are specific to the installation of water services into island benches within Class 1a buildings.
Water services for island benches (PDF File 490.1 KB)
Water services installed in proximity to other services - issued September 2014
When laying water services in close proximity to other services, plumbers must ensure they don't cause any potential nuisance or potential safety hazards. This advisory note highlights the installation requirements plumbers must follow.
Water services installed in proximity to other services (PDF File 758.9 KB)
Performance solution process
Relevant design practitioners who want to use a performance solution for a new plumbing system or for alterations to an existing plumbing system must submit reports on performance solutions to the Office of the Technical Regulator (OTR) prior to installation. All submitted Performance Solution Reports must comply with the National Construction Code Volume 3 A2.2(4) (d).