AS/NZS 3500.2:2025 Plumbing and drainage, Part 2: Sanitary plumbing and drainage
Standards Australia/Standards New Zealand
Supersedes: AS/NZS 3500.2:2021 Plumbing and drainage, Part 2: Sanitary plumbing and drainage
Supersedes: AS/NZS 3500.2:2021 Amd 1:2021 Plumbing and drainage, Part 2: Sanitary plumbing and drainage
Draft Designation: DR AS/NZS 3500.2:2023This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee WS-014, Plumbing and Drainage, to supersede AS/NZS 3500.2:2021.
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 G13 Foul Water
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) New requirements for the installation of waterless urinals to reduce the risk of struvite build up, see Clause 13.24.
(ii) New provisions for the connection of miscellaneous devices and appliances to a sanitary drainage system, see Clause 13.28.
(iii) Updated requirements for the main lines of a sanitary drainage system serving multi-unit developments of 3 or more residential buildings, see Section 14.
(iv) Polypropylene (PP) pipes and fittings included as an alternative materials and products for vacuum drainage systems, see Clause 16.2.
Standards Australia thanks the Moreton Bay Regional Council for permission to reproduce Figures G.5(A) and G.5(B). These figures are copyright of Moreton Bay Regional Council. All rights reserved.
Notes or footnotes to tables or figures that are expressed in mandatory terms are deemed to be requirements of this document.
Notes to clauses in this document are informative only and do not include requirements.
The terms “normative” and “informative” are used in Standards to define the application of the appendices to which they apply. A “normative” appendix is an integral part of a Standard, whereas an “informative” appendix is only for information and guidance.
This document includes commentary on some of the clauses. The commentary directly follows the relevant clause, is designated by “C” preceding the clause number and is printed in italics in a box. The commentary is for information and guidance and does not form part of the document.
Originated as AS 3500.2-1990. Jointly revised and redesignated as AS/NZS 3500.2.2:1996. Jointly revised and redesignated as AS/NZS 3500.2:2003. Previous edition 2021. Fifth edition 2025.Contents:
Section 1: Scope And General
Section 2: Materials And Products
Section 3: Drainage Design
Section 4: Drainage System
Section 5: Excavation Bedding Support And Backfilling
Section 6: General Design Requirements For Sanitary Plumbing Systems
Section 7: Greywater Plumbing And Drainage Systems
Section 8: Fully Vented Systems And Fully Vented Modified Systems — Design And Installation
Section 9: Single Stack Systems And Single Stack Modified Systems — Design And Installation
Section 10: General Installation Of Pipework
Section 11: Reduced Velocity Aerator Stack System
Section 12: Pumped Discharge
Section 13: Fixtures And Appliances
Section 14: Multi-Unit Developments
Section 15: Testing Of Sanitary Plumbing And Sanitary Drainage Installations
Section 16: Vacuum Drainage Design And Installation
Appendix A: (Informative) Demonstrating Products And Materials Are Fit For Purpose
Appendix B: (Normative) Maximum Length Of Fixture Discharge Pipe Without Venting
Appendix C: (Informative) Pipe Grades Conversion
Appendix D: (Informative) Conduct Of Inspections Using Closed Circuit Television
Appendix E: (Normative) Sizing Vacuum Drainage Pipes And Buffers
Appendix F: (Normative) Renovation Of Sanitary Plumbing And Drainage Systems Using Structural Plastics Liners
Appendix G: (Informative) Drains In Unstable Soils
Bibliography
Plumbing and Drainage.
WS-014
Association of Hydraulic Services Consultants Australia; Association of Hydraulic Services Consultants Australia (New Zealand); Australian Building Codes Board; Australian Gas Association; Australian Industry Group; Australian Stainless Steel Development Association; Australian Steel Institute; Backflow Prevention Association of Australia; Chartered Institution of Building Services Engineers ANZ; 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 (MBIE); Plastics Industry Pipe Association of Australia; Plastics New Zealand; Plumbers, Gasfitters and Drainlayers Board; Plumbing Distributors Association of New Zealand; Plumbing Products Industry Group; The Institute of Plumbing Australia; Water New Zealand; Water Services Association of Australia.
