New wastewater standards to cut costs, protect environment and public health
The Government has announced New Zealand’s first-ever national wastewater environmental performance standards developed by the Water Services Authority – Taumata Arowai.
The Government has announced New Zealand’s first-ever national wastewater environmental performance standards developed by the Water Services Authority – Taumata Arowai.
The standards mark a significant step toward improved environmental and public health protection, better public transparency and more efficient consenting, says Dr Sara McFall, Authority Head of Systems, Strategy and Performance.
The standards cover discharges to water and land, rules for the reuse of biosolids and the monitoring and reporting of overflows and bypasses. They apply to publicly owned and operated wastewater networks and will be implemented through future resource consents as they come up for renewal.
“These standards will provide a clear, consistent framework for councils when renewing wastewater consents – something that much of the sector has been calling for,” Dr McFall says.
The standards were shaped by strong sector engagement. Consultation earlier this year attracted more than 150 submissions from councils, industry, iwi and hapū and the public. An engagement report outlines the extensive consultation undertaken.
The finalised standards are risk-based and tailored to environmental sensitivity, providing stricter limits in more sensitive receiving environments and more cost-effective solutions in lower-risk areas. They are designed to be practical, adaptable and based on the best available scientific evidence.
Most of New Zealand’s wastewater infrastructure is 30 to 40 years old. With around 60% of treatment plants needing new consents in the next decade, and many already operating on expired ones, the standards will help councils upgrade ageing infrastructure without unnecessary delays or over-engineering.
Case studies indicate that the new standards could reduce consenting costs by up to 40% per plant — a potential saving of $300,000 to $600,000 — and by as much as 60% for smaller plants.
The standards uphold specific Treaty settlement obligations, providing a framework that respects commitments under settlements and supports iwi and hapū to continue to engage locally with operators on the best options for local communities. This reflects an approach established in the Local Government (Water Services) (Repeals and Amendments) Act relating to the Waikato-Waipā river catchment.
Importantly, the standards introduce national requirements for monitoring and reporting for matters such as overflows.
“This will substantially increase visibility for the public,” Dr McFall says. “At present, there is limited national data on national wastewater infrastructure. Through our annual national reporting, communities will be able to see how their wastewater networks are performing and hold operators accountable.”
Over time, these standards will also help improve wastewater treatment, safeguarding the places that New Zealanders hold dear.
“These standards represent a practical, forward-looking approach that promotes stronger environmental outcomes, greater transparency and meaningful cost savings for local councils,” Dr McFall says.
The standards come into effect on 19 December 2025.
The Authority has prepared preliminary guidance to support councils, operators and consenting authorities. Further guidance materials will be added to the Authority’s website over time.
For more information