Wellington's water system has been failing in slow motion for decades, and in 2026 it broke into open crisis: aging pipes leaking a huge share of the region's treated water, a catastrophic sewage-plant collapse pouring raw effluent into the sea, and a multi-billion-dollar funding gap that no council can close on its own. It is the clearest test in the country of whether New Zealand's local water reforms can fix infrastructure that was neglected for a generation.

What's happening:

• Across the 2024/25 financial year, the average level of water lost from the network (public and private leaks combined) fell from 41% to 37% — but that still means roughly 11 million litres a day less was being lost after a concerted leak-fixing push. Earlier reporting had put losses around 44% region-wide and as high as 52% in Upper Hutt.
• The network is mostly 30 to 100 years old, around 2,543km of pipe, and improvements have come from patching rather than replacement. Wellington Water fixed around 9,000 leaks on the public network in 2024, cutting active public leaks from over 1,700 in January 2024 to under 300 by mid-2025.
• On 4 February 2026 the Moa Point wastewater treatment plant catastrophically failed after heavy rain, with trapped air in a bypass pipe backing wastewater up and flooding the plant. Around 70 million litres of untreated sewage a day discharged near shore, closing south-coast beaches at the peak of summer.
• It was the latest in a run of failures: a 2024 burst near a Days Bay pumping station sent wastewater into the harbour and closed eastern bays, and in 2024 the funding regulator warned that under-funding had created \"extreme residual risks\" at two treatment plants.
• Money is the core problem. Councils had budgeted $3.63 billion of capital works — only about 48% of what Wellington Water said it needed over the next decade, against an estimated ~$25 billion needed over 30 years to catch up on decades of under-investment.

Where the parties stand:

• The Government (National-led coalition): Local Government Minister Hon Simeon Brown launched Local Water Done Well in 2024, repealing Labour's Three Waters and keeping water assets in council ownership while requiring financially sustainable delivery vehicles. As the crisis worsened, ministers (Simeon Brown, later Simon Watts) demanded explanations from Wellington Water over restrictions and the sewage failure.
• Local leaders: Wellington Mayor Andrew Little called Moa Point a \"catastrophic failure\" and an environmental disaster, while backing the recovery. Porirua Mayor Anita Baker has noted her council was already spending over 60% of its budget on three-waters infrastructure.
• Wellington Water leadership: Chair Nick Leggett resigned on 15 February 2026, saying leadership carried responsibility; deputy Bill Bayfield took over as interim chair. Leggett and committee chair Campbell Barry had earlier credited extra council funding for the leak turnaround while warning losses won't be solved without replacing pipes, not just patching them.
• Critics and watchdogs: The water regulator Taumata Arowai (then chief executive Allan Prangnell) pressed councils to plan against summer shortages and set a demand-reduction target of 7.4 million litres a day. Ratepayer advocates warn the new entity's projected bills are steep.

What to watch:

• The new metropolitan water company, Tiaki Wai Metro Water, takes over from 1 July 2026, inheriting about $9 billion of assets, $1.7 billion of debt and a $6.8 billion ten-year capital programme serving ~432,000 people.
• Household water charges are set to climb sharply — averaging around $2,418 in 2026/27 and a projected ~$6,200 by 2036 — testing political tolerance for paying to fix the pipes.
• The Crown-commissioned independent review into the Moa Point failure is due to report, and how long the plant stays offline will shape the summer of 2026/27.
• Whether leak-fixing gains hold once attention fades, and whether pipe renewal (not just patching) actually accelerates under the new entity.