Wastewater Management

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 On-site Wastewater Management

As defined by Regulation 73 in the Public and Environmental Health Regulations:

  1. An on-site wastewater system is a system with a daily hydraulic flow of 8000 litres or less used at a place for the on-site collection and management of wastewater generated at the place.
  2. Examples of an on-site wastewater system include a septic tank, holding tank, aerated wastewater treatment system, biological treatment system, composting toilet system, hybrid toilet system, and a pit toilet.
  3. An on-site wastewater system may, but need not , be connected to sewage.

On-site wastewater installations are predominantly certified by self-certifying plumbers or designers, though the administrative process is dependent on whether the installation is located within a Building Control Area (urban areas and along main highways) or outside Building Control Areas (remote areas).

The Department of Lands, Planning and the Environment administers the provisions of the Buildling Act and the Building Regulations with respect to all on-site wastewater system installations within Building Control Areas.

Environmental Health administers the provisions of the Public and Environmental Health Actand the  Public and Environmental Health Regulations with respect to all on-site wastewater systems located outside Building Control Areas, and also processes Notifications and Wastewater Works Design Approvals for alternative on-site wastewater system installations within Building Control Areas. Environmental Health may also approve conventional on-site wastewater system installations, particularly those on Indigenous housing projects.

Local Government Authorities in the Northern Territory have no jurisdiction over the approval or installation of on-site wastewater systems.

Code of Practice

TitlePublishedAddendum
Code of Practice for Small On-Site Sewage and Sullage Treatment Systems and the Disposal or Reuse of Sewage Effluent11 Nov 19967 Jul 2014

The Code of Practice for Small On-site Sewage and Sullage Treatment Systems and the Disposal or Reuse of Sewage Effluent (referred to as the 'Code of Practice for On-site Wastewater Management' in the Public and Environmental Health Regulations) is the design manual for on-site wastewater management in the Northern Territory.

This Code applies to any on-site wastewater system or part thereof (including land-based disposal or reuse of recycled water) with a maximum daily flow of 8000 litres.

The Code is also available in hard copy from Environmental Health who can be contacted on (08) 8922 7152.

Product Approval of an On-site Wastewater System

All on-site wastewater systems up to a maximum size of 10 equivalent persons (EP) require product approval in accordance with Division 4 of the Public and Environmental Health Regulations before being able to be sold and installed in the Northern Territory. Product approval provides authorisation for the installation of that type of pre-manufactured on-site wastewater systems anywhere in the Northern Territory, subject to compliance with any conditions placed on the approval. Product Approvals are subject to local conditions imposed through wastewater works design approvals by the Chief Health Officer.

Pre-manufactured products include septic tanks, aerated wastewater treatment systems (AWTS), greywater reuse systems, composting toilets and biological filter systems.

An application for Product Approval of an on-site wastewater system must be submitted to the Director of Environmental Health. It must be accompanied by the relevant fee and information detailed in the relevant application form and Fact Sheet 508 'Public and Environmental Health Regulations - Prescribed Fees from 1 July 2014 to 30 June 2015 for Wastewater Approvals'.

TitleForm No.Published
Application for Product Approval of an On-site Wastewater System (S1a) (Adobe PDF document - 234KB) | DOCX (92KB)S1a25 Aug 2014
Application to Vary a Product Approval of an On-site Wastewater System (S1b) (Adobe PDF document - 225KB) | DOCX (93KB)S1b25 Aug 2014
Application to Renew a Product Approval of an On-site Wastewater System (S1c) (Adobe PDF document - 234KB) | DOCX (91KB)S1c25 Aug 2014


Register of Product Approved On-site Wastewater Systems

Register NamePublished

Aerated Wastewater Treatment Systems (Adobe PDF document - 87KB)

7 Aug 2014

Alternative Treatment Systems (Adobe PDF document - 15KB)

30 Sep 2013

Composting, Hybrid & Incinerating Toilets (Adobe PDF document - 19KB)

25 Mar 2013
Greywater Diversion Devices (Adobe PDF document - 32KB)14 Jan 2013
Greywater Treatment Systems (Adobe PDF document - 14KB)7 Aug 2014
Septic Tanks (Adobe PDF document - 22KB)25 Mar 2013
Sewage Ejection Pump Stations (Adobe PDF document - 15KB)1 Oct 2013

Forms for the Installation of On-site Wastewater Systems

Form NameForm No.Published

Notification of Installation & Completion of an On-site Wastewater System (S2) (Adobe PDF document - 216KB) | DOCX (90KB)

This notification applies to an on-site wastewater system (including upgrades and systems connected to sewerage) installed outside a Building Control Area and any on-site wastewater system installed in a Class 1a building (single dwelling) providing a minimum of secondary treatment.

S225 Aug 2014

Application for Wastewater Works Installation Approval of an On-site Wastewater System (S3a) (400 RU) (Adobe PDF document - 276KB) | DOCX (89KB)

This application applies to DoH installation approval for an on-site wastewater system (i.e. septic tank system) servicing a Class 1a building (single dwelling) outside a Building Control Area.

S3a25 Aug 2014

Application to Vary Wastewater Works Installation Approval of an On-site Wastewater System (S3b) (100 RU) (Adobe PDF document - 280KB) | DOCX (90KB)

This application applies to vary an existing DoH installation approval for an on-site wastewater system (i.e. septic tank system) servicing a Class 1a building (single dwelling) outside a Building Control Area.

S3b25 Aug 2014

Application for Wastewater Works Design Approval (Less Than 8000L) (S4a) (Adobe PDF document - 137KB) | DOCX (199KB)

This application applies to wastewater works with a maximum daily flow of 8000 litres servicing commercial, industrial and multiple dwelling developments and any developments within a Power and Water Corporation - Water Protection Zone.

S4a25 Aug 2014

Application to Vary Wastewater Works Design Approval (Less Than 8000L) (S4b) (Adobe PDF document - 140KB) | DOCX (201KB)

This application applies to vary an existing wastewater works design approval for wastewater works with a maximum daily flow of 8000 litres servicing commercial, industrial and multiple dwelling developments and any developments within a Power and Water Corporation - Water Protection Zone.

S4b25 Aug 2014

Notification of Completion of a Wastewater Works Design Approved System (S4e) (Adobe PDF document - 161KB) | DOCX (91KB)

This notification form applies to a wastewater works design approved system that has been installed with DoH wastewater works design approval or approval to vary a DoH wastewater works design approval.

S4e25 Aug 2014


Guidelines for Land Capability Assessment for On-site Wastewater Management

The Department of Health has developed 'Guidelines for Land Capability Assessment for On-site Wastewater Management' to assist proponents of unsewered development proposals to:

  • assess the capability of the site to sustainably manage wastewater within allotment boundaries;
  • identify public and environmental health impacts of on-site wastewater management and in particular the effect on groundwater and surface water on sites; and
  • identify management programs to minimise these impacts; in addition to best practice regulation.
TitlePublished
Guidelines for Land Capability Assessment for On-site Wastewater Management (Adobe PDF document - 1439KB) | DOCX (1381KB)19 Mar 2014


Wastewater Works Design Approval of Recycled Water Systems

Recycled water is an integral part of ensuring a sustainable water supply in the Northern Territory. With the changes and improvements in technology, the effect of climate change on water resources, population growth and the increasing price of water, future demand for recycled water is expected to rise.

In November 2006, the National Environment Protection and Heritage Council, the Natural Resource Management Ministerial Council and the Australian Health Ministers Conference released the Australian Guidelines for Water Recycling: Managing Health and Environmental Risks (Phase 1). These guidelines update and replace the National Guidelines for Sewerage Systems - Use of Reclaimed Water 2000 which are currently referenced in Part 5 of the NT Code of Practice for Small On-site Sewage and Sullage Treatment System and the Disposal or Reuse of Sewage Effluent.

The 'Draft Guidelines for Wastewater Works Design Approval of Recycled Water Systems' align the principles outlined in the Australian guideline to the DoH approvals process for recycled water systems with a minimum daily flow of 8000 litres. The guidelines provide practical advice, including some examples, for obtaining approval to install and operate a recycled water system in the NT.

TitlePublished

Guidelines for Wastewater Works Design Approval of Recycled Water Systems (Adobe PDF document - 1089KB) | DOCX (1022KB)

9 Jul 2014

Forms for Recycled Water Systems

TitleForm No.Published

Application for Wastewater Works Design Approval (Greater Than 8000L) (S4c) (Adobe PDF document - 141KB) | DOCX (201KB)

This application applies to wastewater works with a minimum daily flow of 8000 litres servicing commercial, industrial and multiple dwelling developments and any developments within a Power and Water Corporation - Water Protection Zone.

S4c25 Aug 2014

Application to Vary Wastewater Works Design Approval (Greater Than 8000L) (S4d) (Adobe PDF document - 141KB) | DOCX (201KB)

This application applies to vary an existing wastewater works design approval for wastewater works with a minimum daily flow of 8000 litres servicing commercial, industrial and multiple dwelling developments and any developments within a Power and Water Corporation - Water Protection Zone.

S4d25 Aug 2014

Application for Irrigation of Recycled Water (S5) (Adobe PDF document - 122KB) | DOCX

This application applies to wastewater works design approval to use recycled water sourced from a DoH approved recycled water system or for land application from a Power and Water Corporation wastewater treatment plant.

S525 Aug 2014

Notification of Completion of a Wastewater Works Design Approved System (S4e) (Adobe PDF document - 161KB) | DOCX (91KB)

This notification form applies to a wastewater works design approved system that has been installed with DoH wastewater works design approval or approval to vary a DoH wastewater works design approval.

S4e25 Aug 2014


Fact Sheets - Wastewater Management

TitlePublishedNo.
Decommissioning or Reuse of On-site Wastewater Systems (Adobe PDF document - 58KB)Aug 2011500
Disposal of Septage from On-site Wastewater Systems (Adobe PDF document - 32KB)Aug 2011501
Manual Bucketing & Temporary Diversion of Greywater in Single Domestic Premises (Adobe PDF document - 48KB)Aug 2011502
Permanent Greywater Reuse (Adobe PDF document - 49KB)Aug 2011503
Maintaining an On-site Wastewater System (Adobe PDF document - 34KB)Apr 2011504
Modular Leach Drain Cells (Adobe PDF document - 26KB)Aug 2011505
Trade Waste Pre-treatment Devices (Adobe PDF document - 29KB)Nov 2012506
Prescribed Fees - Wastewater (Adobe PDF document - 187KB)25 Aug 2014508
Design of Sewage Ponds & Recycling (Adobe PDF document - 49KB)Aug 2011511
Standards for Microbiological Quality of Recycled Water for Irrigating Food Crops (Adobe PDF document - 42KB)Aug 2011512
Recycled Water Irrigation: Information Guide for Applicants (Adobe PDF document - 33KB)Aug 2011513
Changes or mods to onsite wastewater systems (Adobe PDF document - 43KB)Dec 2011514
Setbacks from Domestic Bores to Onsite Wastewater Systems (Adobe PDF document - 37KB)Dec 2011515
Installation of Pit Toilets (Adobe PDF document - 45KB)Nov 2012516
Requirements for AWTS subsurface irrigation for commercial & industrial developments (Adobe PDF document - 80KB)Dec 2012517
Admin Procedures - Waterless Composting Toilets (Adobe PDF document - 150KB)Mar 2013518