Wellington Water is a council controlled organisation (CCO) that is owned by six local councils in the greater Wellington region.The entity describes itself as a “100 percent council owned and funded” “professional water services provider”. The entity is involved in ‘three waters’, providing drinking water, wastewater, and stormwater services.

Wellington Water in the process of being converted into a new water company CCO named “Tiaki Wai” as part of the “Three Waters” “Local Water Done Well” reforms.

Wellington Water has had a history of problems.

Wellington Water has had a bad few months in the news headlines in early 2026, with four general issues dominating the headlines from January to March 2026.

  1. The Seaview Wastewater Treatment Plant’s odour problems are still not fixed after many years of problems and complaints. The plant is operated by the French-owned, multinational corporation named “Veolia”, which is contracted by Wellington Water, which in turn is somewhat accountable to various elected councils in the greater Wellington region. The Seaview plant has also been failing by discharging partially-treated sewage into Wellington Harbour.
  2. In early February, there was a massive spill of untreated sewage into Cook Strait after failures at the Wellington Treatment Plant.
  3. General pipes bursting in the streets and sewage exploding up into residential bathrooms.
  4. Under the new water company (named “Tiaki Wai”) the annual water bill for an average Wellington household is expected to be $2400 next year and rise to $6831 by 2036.

Prominent examples of articles about Wellington’s water company for January-March 2026, include:

Quotes

“Hutt City Council wants assurance that its own sea-side sewage treatment plant will not suffer the same disastrous failure as Wellington’s Moa Point plant.

It has asked Wellington Water whether the Seaview plant, near Petone, has the same equipment as Moa Point which flooded a room the size of an Olympic swimming pool 3-metres deep with sewage on 4 February.

The facility has been sending tens of millions of litres of raw sewage into Cook Strait each day since and an independent inquiry into the failure has been signalled from central government and Wellington City Council.

For years the Lower Hutt Seaview sewage plant has been an issue for locals particularly due to its odour, with it being reported in January 2024 that $40,000 worth of fines were dished out to the facility’s owners.”

Nick James, Hutt City Council seeks assurance after Wellington’s sewage treatment plant failure, RNZ, 26 February 2026.

 

“Wellingtonians will face “really steep” increases in their water bills over the next decade, to as high as $6831 a year, as the city’s new water entity tries to fix old, failing infrastructure, its chairman says.

That would start with an average increase in water charges of 14.7 percent, or an extra $310 this year, with charges possibly increasing by 28 percent in 2027-2028, and more than doubling by 2036.

Those living in Wellington City, Porirua, Hutt City, and Upper Hutt have been paying an average of $2100 a year for water through council rates. From July, they will receive separate quarterly water bills, and would have to set up new payments to Tiaki Wai.

Put another way, an average household across the region’s four cities – Wellington, Lower Hutt, Upper Hutt and Porirua – was set to pay about $2418 per year this coming year, and pay $6831 (with inflation) by 2036.”

Ellen O’Dwyer, Wellingtonians face average $2400 water bill next year, massive increases to follow,RNZ, 25 March 2026.

 

 

 

Further reading on this issue:

Wellington Water CCO: November-December 2024 Media Coverage

OPINION: Water is Life – But Can You Afford It?

Household Water Costs in Hamilton City Projected to Triple within 9-years under New Water Company

Concerns that areas of Hamilton are “wastewater network constrained”

OPINION: Serious Mismanagement and Lack of Accountability with Water Services

OPINION “Local Water Done Well” and the Hamilton Ratepayer