Commerce watchdog pitches rules to monitor Wellington’s new water provider
Friday, 8 May 2026
The Commerce Commission is pitching new rules to ensure residents can keep tabs on Tiaki Wai’s use of money.
Its also considering performance regulation to incentivise Tiaki Wai to invest efficiently, prioritise delivery in high-risk areas, and improve service outcomes over the long term.
The proposal comes after a public spat between Wellington Mayor Andrew Little and Local Government Minister Simon Watts over spiralling water bills revealed in its draft water services strategy.
It showed the average household across Wellington City, Porirua and Hutt Valley now pays about $2100 a year for water, albeit via rates. Come July 1, it would be a standalone bill and an average of $310 would be added.
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The Pitch
Under the new rules the Commerce Commission wanted to make Tiaki Wai front up with a range of assessments so that the public and decision makers could see what they were putting their money towards.
These included a strategic asset management plan, an investment and delivery plan and an annual delivery report.
The commission’s head of water regulation, Charlotte Reed, said it would “encourage Tiaki Wai to demonstrate credible planning, prudent investment and to make steady improvement”.
Performance regulation was also a change the commission was looking at which might see it set specific targets the organisation is required to complete by a certain deadline.
Reed said the commission believed the requirements would entice the water entity to prioritise critical improvements and deliver them on time.
Consultation documents on the plans did not close the door on the Commerce Commission stepping in and deciding the cost of Tiaki Wai’s water bills.
“That may happen in the future but making good decisions about pricing needs good information. Developing that information is a key focus of our proposals.”
Tiaki Wai’s response
Tiaki Wai Board Chair Will Peet said the proposed changes would give people confidence in the entity’s work.
“We are acutely aware of the importance of every dollar of customers’ money and have a strong focus on delivering value for money. The independent, professional oversight of the Commerce Commission will provide transparency for our communities.”
Peet said Tiaki Wai would be looking at what’s proposed in detail and responding to the Commerce Commission.”
Wellington Mayor Andrew Little said he campaigned on protecting the capital from unfair prices through the Commerce Commission.
“The lack of 'price quality' regulation for Wellington has been a gap in the central government's local water done well policy, when Aucklanders have that protection.”
Little said the proposed changes were a positive step which now need to be considered.
Local Government Minister Simon Watts had previously disagreed with Little that there was not economic regulation under the local water done well but agreed with the mayor that the Commerce Commission should address Tiaki Wai’s costs.