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AS/NZS 3500.1:2021 Plumbing and drainage, Part 1: Water services

Standards Australia/Standards New Zealand

Version:  Fourth Edition 2021.  (Current)
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The objective of this document is to provide installers with Deemed-to-Satisfy solutions to comply with —

(a) the National Construction Code (NCC) Volume Three, Plumbing Code of Australia (PCA); and
(b) the New Zealand Building Code (NZBC), Clause G12 Water Supplies.

A list of all parts in the AS/NZS 3500 series for plumbing and drainage can be found in the Standards Australia and Standards New Zealand online catalogues.

The major changes in this revision are as follows:

(i)    Conformance to individual product standards has been removed. All products used in plumbing and drainage systems in Australia need to comply with the PCA and, in New  Zealand, the NZBC, see Appendix B for further information. Removal of specific product standard conformance requirements avoids inconsistencies and contradictions between this document and the PCA and NZBC.
(ii)    Definitions have been relocated to AS/NZS 3500.0. This was done for consistency across the series.
(iii)    A number of the backflow prevention provisions, which were considered matters of public policy, have been elevated to PCA Part B5 Cross Connection Control. To remove duplication  between PCA 2019 and AS/NZS 3500.1, the provisions relating to cross-connection hazards  and the corresponding hazard rating have been removed. This also avoids inconsistencies  between the cross-connection hazards and the corresponding hazard rating in this document and in NZBC Acceptable Solution G12/AS1. Consequently, Appendix F has been deleted, and all remaining backflow provisions have been consolidated in Section 4.
(iv)    Jointing requirements for plastics pipes have been clarified and expanded to allow different methods.
(v)    Changes to the requirements for the marking of pipes in commercial buildings to assist in the better identification of pipework and avoid cross connections.
(vi)    Changes to the requirements for the installation of water services located in metal- framed walls to bring the provisions in line with those of the National Association of Steel- framed Housing.
(vii)    Clause 5.4 relating to bushfire zones has been removed in anticipation of requirements relating to bushfire prone areas being elevated to the PCA.
(viii)    Section 12 relating to special connections for specific fixtures has been removed. With backflow requirements being moved to the PCA, listing these few examples would be inappropriate. The WaterMark specifications for the product would identify what backflow devices were required.

First published as AS 3500.1-1990. Jointly revised and redesignated as AS/NZS 3500.1:2003.


This document specifies requirements for the design, installation and commissioning of cold water
services from a point of connection to the points of discharge, and for non-drinking water from a point of connection to the points of discharge. It applies to new installations as well as alterations, additions and repairs to existing installations.

Illustrations used in this Standard are diagrammatic only and have been chosen without prejudice.


Section 1: Scope And General
Section 2: Materials And Products
Section 3: Sizing Of Water Services
Section 4: Cross-Connection Control And Backflow Prevention
Section 5: Installation Of Cold Water Services
Section 6: Fire Services
Section 7: Irrigation And Lawn Watering Systems
Section 8: Water Storage Tanks
Section 9: Non-Drinking Water Services
Section 10 Treated Greywater Services
Section 11: Water For Sanitary Flushing
Section 12: Pumps
Section 13: Water Requirements For Haemodialysis Machines
Section 14: Property Water Meters
Section 15: Installation Of Water Supply System From Rainwater Tanks
Section 16: Multi-Unit Developments
Section 17: Testing And Commissioning
Appendix A: (Normative) Equivalent Pipe Sizes
Appendix B: (Informative) Demonstrating Products And Materials Are Fit For Purpose
Appendix C: (Informative) Sizing Method For Supply Piping For Dwellings
Appendix D: (Informative) Sizing Of Piping For Dwellings
Appendix E: (Informative) Examples Of Potential Cross-Connections
Appendix F: (Informative) Storage Tanks — Inflow And Overflow
Appendix G: (Normative) Cleaning And Disinfection Of Storage Tanks
Appendix H: (Normative) Disinfection Of Water Services


Plumbing and Drainage.


Association of Hydraulic Services Consultants Australia; Australian Building Codes Board; Australian Industry Group; Australian Stainless Steel Development Association; Backflow Prevention Association of Australia; Engineers Australia; Hydraulic Consultants Association Australasia; International Copper Association Australia; Master Plumbers Australia and New Zealand; Master Plumbers, Gasfitters and Drainlayers New Zealand; Ministry of Business, Innovation and Employment (NZ); Plastics Industry Pipe Association of Australia; Plastics New Zealand; Plumbers, Gasfitters and Drainlayers Board (NZ); Plumbing Distributors Association of New Zealand; Plumbing Products Industry Group; The Institute of Plumbing Australia; Water New Zealand; Water Services Association of Australia.

978 1 76113 345 9
Standards Australia/Standards New Zealand 2021.
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AS/NZS 3500.1:2021 Plumbing and drainage, Part 1: Water services 2021 cover