Current Projects are the projects Water New Zealand is currently leading.
Supported Projects are the projects Water New Zealand is contributing to but are lead by another organsiation.
Project Proposals provides information related to submissions for new projects stakeholders feel Water New Zealand should be involved in or lead.



This project aims to develop a consistent set of guidelines to direct rainfall runoff and flow modelling across New Zealand catchments. The need for consistent rainfall and runoff guidance has been raised by individual members, the Modelling Special Interest Group and the Rivers Group.

It is unlikely that Ministry funding for this project will occur. Plan B is to identify what elements of the Australian ARR (which have just been completed) can be adapted for NZ use, or develop a scope of local requirements which we can slowly start working on.

The first step will be to reconvene the Committee overseeing this work and get their agreement to two pieces of work we can do over the next two years and develop them up as technical projects to be managed by Water New Zealand staff. A meeting is scheduled for May.


Water New Zealand has an advisory group coordinating initiatives to reduce wipe blockages in the sewer network. Work overseen by the advisory group includes standards development, co-ordination of communication messages and studies to the understand the origin of wipes in the sewage network.

Manufacturers and suppliers of wipes have assisted Watercare in a project to determine the origin of blockages at the Mangere Treatment Plant. Results have been used as the basis for developing a communications campaign. The Food and Grocery Council have developed a video explaining what bathroom products cannot be placed in toilets, funded by their members. We are planning to jointly launch this in March. A watching brief remains on the development of international standards for determining flushability.


Guidelines for beneficially reusing organic wastes on land are under development. The guidelines will supersede 2003 Guidelines for the Safe Application of Biosolids to Land and include other organic material such as animal manures, which also contain pathogens and contaminants. Water New Zealand, WasteMINZ, the Centre for Integrated Biowaste Research (CIBR) and the New Zealand Land Treatment Collective (NZLTC) are collaborating on their delivery. The draft manual for consultation can be viewed here.

Nick Walmsley ran five regional meetings to discuss the draft during February 2017, which over 100 people attended. Meeting notes are available here. Twenty-three submissions from 36 individuals and organisations were subsequently received. The project Steering Group held a meeting to consider these submissions on 27 April 2017 and have formulated a proposed forward programme to completion, including an additional period for the next draft documents to be publically reviewed and submissions received. The Steering Group meeting notes and full copies of the submissions can be viewed here.


The database contains test data on AC pipes around New Zealand and is used as the basis of lifetime prediction and analysis curves. The accompanying manual provides specifications for sampling, testing and condition grading. Information in the manual and database is being updated and expanded to include contemporary information and improve usability.

The contents of the manual have been finalised. Workshops to assist users of the model implement their contents are under development. To register your interest in attending contact


Previous work and contemporary New Zealand and International expertise is being collated to develop guidance on operations and maintenance, desludging, decommissioning and advanced microbial digestion in waste stabilisation ponds (oxidation ponds).


In 2016 revisions where incorporated into good practice guidelines for the supply of chlorine, Aluminium Sulphate, Hydrated Lime, and Polyelectrolyte. These can be found in Water New Zealand's Library. Ministry of Health is undertaking further work to determine chlorate levels in Drinking Water Supplies. This work will be completed and incorporated into chlorine guidance document in 2018. The chlorine guideline has been provided as provisional advice until this amendment.

The guidelines provide purchasers, manufacturers, and suppliers with the minimum physical, chemical and testing requirements for drinking water chemicals to meet safe limits. To ensure limits are met all operators should request a certificate of compliance when purchasing chemicals for use in drinking water, in accordance with processes outlined in the guide. Water New Zealand has an interest in the effective implementation of these guidelines. To assist us monitor this, we would appreciate copies of your certificate of compliance and associated lab results. Please send these to:


This project will provide good practice guidance on the development of Chlorine Emergency Response Plans for water treatment plants, wastewater treatment plants and swimming pools. BECA is leading the development of the guidelines.

Additional modelling is required to calculate the theoretical release rates. The intention is to have this project completed prior to the WSMG meeting in early April.


Opportunities for greater consistency in discharge consent compliance practices were reviewed at two 2014 workshops. Outcomes are listed in workshop proceedings and outputs. Water New Zealand are in discussion with a range of government departments to advance these outcomes. This project is likely to recommence in May/June 2017.

Good Practice Guide for Developing Pressure Sewer Systems

This project will provide industry guidelines to assist local authorities’ decision making on pressure sewer systems. As there is currently no guidance or standard specification for pressure sewer systems in New Zealand the purpose of the guide is to address this gap in order to;

  • reduce up front cost in the development of policies and standards
  • reduce the inconsistency in equipment specifications to reduce cost and complexity for suppliers
  • facilitate the sharing of existing knowledge to improve the effectiveness of pressure sewer systems
  • provide a tool to assist in the selection of pressure, vacuum and gravity sewer reticulation.

This project is expected to be completed prior to Sep 2017.

Code of Practice for Water Metering Updates

Water New Zealand technical staff will draw on the experiences of a WSMG advisory group to complete the updates to the existing water meter code of practice and disseminate outcomes. A draft document for comment is expected before June 2017.


Auckland Council has given Water New Zealand approval to use GD06 (the old AC TP58) to convert to a national Water New Zealand guidance document. Water New Zealand will be establishing an industry advisory group to agree the scope of the rewrite. We anticipate the work starting in June and being completed by year end.



National metadata standards are being developed to provide a consistent approach to the way data on 3 waters is captured, described and stored. LINZ is leading the project in collaboration with a large number of stakeholders.

Between now and June 30 LINZ have a plan in place to complete the draft standards. This will involve two rounds of consultation with the wider water industry; expected in May. The plan is to release the standards in a “completed” form 30 June


Water New Zealand the Quake Centre and IPWEA are pleased to announce the release of Evidence Based Investment Decision Making for 3 Water Pipe Network Programme (Pipe Renewals Guidelines Programme). The three organisations have agreed to work co-operatively to develop guidance documents and tools to assist New Zealand’s water organisations to make nationally consistent, evidenced-based decisions relating to the management and renewal of their 3 Water Pipe Networks. The programme covers inspection, maintenance and renewal strategies for pipework in potable water, wastewater and stormwater systems.

View the documents here.


Water New Zealand is supporting a BRANZ research investigation to improve the understanding of residential water use in New Zealand. The building research levee has approved $290,000 to be delivered over two years to fund the project. Council participation in the project is currently being sought.

Deep South National Science Challenge

The Deep South Science Challenge, hosted by NIWA, is a research collaboration between a number of Crown Research Institutes, universities and research providers. The challenges mission is to enable New Zealanders to adapt, manage risk, and thrive in a changing climate. Water New Zealand’s technical team is providing input into a Representative User Group to inform and disseminate relevant research on the impacts and implications of climate change on urban water systems. The science challenge has also provided $7,000 to support an interactive climate change session in this year’s modelling symposium.

National Science Challenge: Resilience to Nature's Challenges Advisory Group

Water New Zealand’s technical team are part of the Advisory Group for the “Distributed Infrastructure” work stream of the Resilience Challenge. This is one of the government funded National Science Challenges that aims to develop and apply new scientific solutions to transform our preparedness, response, recovery and “bounce-back” from our wide diversity of natural hazards. This is a collaborative project across a wide range of research institutions, and a key part of this process is the development of outcomes shaped by stakeholder or ‘co-creation’.

The aim of the Distributed Infrastructure work stream is to develop an improved understanding of the resilience of spatially-distributed infrastructure networks to extreme natural hazards, with a focus on incorporating network functionality modelling into this work. More information on the wider challenge can be found at .

Project Proposals

Water New Zealand collaborates with a range of stakeholders to deliver projects that pool the collective knowledge of our membership. Projects are funded through; Water New Zealand finances, government funding, project participant fees, or grants.

Most projects are driven by Work Plans of our Special Interest Groups and Water Service Managers Group. Members may also propose projects, where support of the broader membership and outputs benefiting the New Zealand Water industry can be demonstrated.

To submit a project proposal complete the Business Case Proposal Template and email to: