Wellington Wastewater and Water Governance

The story so far

In March 2025, two reports into Wellington Water found alleged theft, poor value from contractors and unplanned repair costs up to three times higher than necessary.^{3, 5 Mar 2025} Unplanned pipe maintenance spending trebled between 2017 and 2022, and the two investigations, which cost $330,000, also identified fraud risks and close ties with contractors.^{4, 5 Mar 2025} Wellington's mayor and several councillors called for board chair Nick Leggett to resign, and he said he was considering his position, but after an extraordinary meeting with shareholding councils he was expected to stay.^{4, 6, 10 Mar 2025} The Commerce Commission began investigating the entity's procurement, and the Government later tasked it with economic monitoring of Wellington Water because of concerns about high costs and unsound financial management.^{4, 28 Mar 2025} Separately, in August 2025 Wellington City councillors approved an extra $83 million to complete the Moa Point sludge minimisation plant, taking projected costs to over $500 million, more than double the 2021 estimate.^{14, 20 Aug 2025}

Latest

Crown and other reports in September 2026 into the February failure of the Moa Point wastewater plant found systemic governance and risk failures, design flaws, and warnings that were not acted on or did not reach decision-makers.^{2, 21 Sep} Greater Wellington Regional Council has filed criminal charges against Wellington City Council and Tiaki Wai over the failure, with potential fines of up to $100 million each if the allegations are proven.^{1 Oct}

Key moments

1. 3 Mar 2025Reports reveal alleged theft and high maintenance costs at Wellington Water; calls for chair to resign.
2. 5 Mar 2025Reports find contractors paid up to three times too much for unplanned repairs.
3. 6 Mar 2025Minister seeks advice on intervention as mayor and councillors urge chair to resign.
4. 10 Mar 2025Chair expected to stay on after extraordinary meeting with shareholding councils.
5. 28 Mar 2025Government tasks Commerce Commission with economic monitoring of Wellington Water.
6. 20 Aug 2025Councillors approve extra $83 million for sludge plant; independent review request voted down.
7. 2 SepCrown review finds systemic failures behind the Moa Point wastewater failure.
8. 1 OctRegional council files criminal charges against Wellington City Council and Tiaki Wai.

Written from the stories below; each sentence links to its sources.