New national wastewater standards aim to modernise aging infrastructure, protect public health and the environment, and bring long-sought-after clarity and consistency to wastewater consenting.
On 19 December 2025, New Zealand’s first ever national wastewater environmental performance standards came into effect. These standards were developed by the Water Services Authority – Taumata Arowai.
The wastewater standards address one of the country’s most pressing infrastructure challenges: renewing and upgrading wastewater systems that are, in many cases, decades past their design life.
With most treatment plants now 30 to 40 years old, and around 60 per cent needing new resource consents within the next decade, the new standards are designed to lift performance while reducing unnecessary complexity, cost and delay.
‘These standards mark a significant step forward for environmental and public health protection, public transparency, and more efficient consenting,’ says Dr Sara McFall, Authority Head of Systems, Strategy and Performance, Water Services Authority – Taumata Arowai.
Why national wastewater standards matter
Until now, wastewater consenting has largely been addressed on a case-by-case basis through the Resource Management Act (RMA), often resulting in inconsistent requirements across regions and costly, time-consuming processes for councils and operators.
The new wastewater standards provide a clear and consistent national framework. As regulations under the Water Services Act 2021, they set requirements, limits, conditions, and prohibitions for activities associated with publicly owned and operated wastewater networks. They are also a core part of Local Water Done Well, the government’s approach to tackling longstanding water infrastructure challenges.
Crucially, the standards are designed to be risk-based. Treatment requirements vary according to the sensitivity of the receiving environment. Where environmental or public health risks are higher, stricter treatment applies. In lower risk settings, requirements are less stringent, helping to avoid over-engineering and keep costs manageable.
Case studies suggest that the approach could reduce consenting costs by up to 40 per cent per treatment plant – equivalent to savings of $300,000 to $600,000 – and by as much as 60 per cent for smaller plants.
What the standards cover
The wastewater standards apply to discharges to land and water, the reuse of biosolids, and the monitoring and reporting of overflows and bypasses. They will be implemented through future resource consents, as existing consents expire and are renewed.
‘The sector has been calling for clearer direction for a long time,’ says McFall. ‘These standards give councils a consistent framework for renewing wastewater consents while still accounting for local environmental sensitivity.
The existing RMA consenting process will continue to apply in areas outside the scope of the standards. This includes particularly sensitive environments, such as geothermal waterways, or areas with contaminants of local significance, like heavy metals.
Shaped by strong sector engagement
The standards are the product of extensive engagement. Consultation attracted more than 150 submissions from councils, industry, iwi, hapū and members of the public.
The final framework reflects this input. It is grounded in the best available scientific evidence, designed to be practical and adaptable, and calibrated to environmental risk.
‘The standards uphold specific Treaty settlement obligations – for instance, in the Waikato-Waipā and Whanganui catchments,’ says McFall.
‘They also provide a framework that supports ongoing local engagement between iwi, hapū and wastewater operators on solutions that best meet community needs.
‘Our engagement with the sector is ongoing. There have been some minor and technical issues in the standards that have been flagged to us for investigation and further action where necessary.’
National monitoring and reporting
For the first time, the standards introduce national requirements for monitoring and reporting key wastewater performance measures, including overflows.
‘This will substantially increase public visibility of the state of wastewater in New Zealand,’ McFall says. ‘At present, there is very limited national data on wastewater infrastructure. Through annual national reporting, communities will be able to see how their networks are performing and hold operators to account.’
Over time, the Water Services Authority expects this transparency to drive continuous improvement in wastewater treatment, and better protection of waterways and coastal environments.
Transitioning to the new standards
All public wastewater network operators will eventually need to comply with the new wastewater standards when applying for new consents or renewing existing ones. Consenting authorities can no longer issue consents that conflict with the standards unless specific exceptions apply.
Key transition provisions include:
- a two-year limit on extensions for plants operating on expired consents under section 124 of the RMA, effective from 19 December 2028
- automatic extension of consents expiring between 27 August 2025 and 27 August 2028, giving operators time to plan upgrades and prepare applications
- the ability for the Minister for the Environment to extend consent expiry dates beyond August 2028 on a case-by-case basis
- flexibility for consenting authorities to allow up to five years for infrastructure upgrades, including interim or temporary consent conditions.
Requirements for overflows and bypasses will come into effect on 19 December 2028. This delayed start allows operators to develop stormwater and wastewater risk management plans to support future consent applications related to overflows and bypasses.
The standards will operate alongside wider reforms to the resource management system, and may be adjusted over time to align with future changes, such as planned changes to new activity status categories.
Regional councils will continue to have discretion over matters not prescribed in the standards, such as the management of emerging contaminants and wastewater systems. This is also the case where wastewater arrangements are not controlled by the standards, such as private wastewater schemes.
Guidance and what’s next
The Authority has released preliminary guidance to support councils, operators and consenting authorities, with further guidance to be added over time.
Monitoring implementation of the standards
The Authority will monitor how the standards are implemented through future resource consents. Requirements in the standards may be amended over time to address implementation challenges, or as new information becomes available (e.g., about contaminants in wastewater).
The Authority is also working on tools to support operators to meet reporting requirements in the standards.
Future wastewater standards
McFall says this initial suite of wastewater standards covers the most common wastewater management activities – areas that will bring the biggest benefits from lifting performance.
‘There are other areas that could benefit from a consistent national approach, such as discharges to air from treatment plants and networks,’ says McFall. ‘We’re talking to the sector about what a second tranche of standards might include.’
National Engineering Design Standards
The Authority now has its sights set on developing National Engineering Design Standards (NEDS) and National Codes of Practice for drinking water, wastewater, and stormwater networks.
‘NEDS will set mandatory, performance-based requirements for design, construction and operation of these networks,’ says McFall.
The codes of practice will provide pre-approved pathways for compliance with the NEDS, while still allowing for alternative, innovative solutions.
The Authority will be seeking to actively engage with industry, operators and other stakeholders over the next few months to ensure that these standards deliver tangible benefits through consistency and standardisation. 
For more information, visit www.taumataarowai.govt.nz/wastewater-sector/wastewater-standards.
At a glance: what public wastewater providers need to know
What’s new?
New national environmental performance standards now apply to publicly owned and operated wastewater networks, setting consistent requirements for treatment, discharges, monitoring, and reporting.
When do they apply?
The standards came into effect on 19 December 2025, and will be implemented through new and renewed resource consents.
Who must comply?
All public wastewater network operators. Private schemes and matters outside the scope of the standards remain subject to existing RMA processes.
What do they cover?
- Discharges to land and water
- Biosolids reuse
- Monitoring and reporting of overflows and bypasses
- Risk-based treatment requirements linked to environmental sensitivity.
What’s excluded?
Highly sensitive environments (e.g., geothermal waterways) and contaminants of local concern (such as heavy metals) continue to be managed through the RMA outside the standards.
What about existing consents?
- Consents expiring between 27 August 2025 and 27 August 2028 are automatically extended to 27 August 2028.
- Plants operating on expired consents face a two-year extension limit from December 2028.
Are upgrades required?
Some plants will need infrastructure upgrades. Consenting authorities can allow up to five years for upgrades and impose interim consent conditions.
Overflows and bypasses
New requirements take effect on 19 December 2028, allowing time for stormwater and wastewater risk management planning.
Why it matters
- Clearer, more consistent consenting
- Potential cost savings of 40–60 per cent on consenting
- Improved public transparency and accountability
- Stronger protection of public health and the environment.
