Mega tunnel signed off for $1.2 billion project to bring cleaner beaches, waterways to Auckland

The biggest wastewater project ever undertaken in New Zealand has been signed off today, with a $1.2 billion mega tunnel aiming to bring cleaner beaches and waterways to Auckland.

The Central Interceptor is a 13km tunnel that will run between Western Springs and the Māngere Wastewater Treatment Plant.

It will collect wastewater and stormwater from overflow points, transporting it to Māngere for treatment.

Watercare chief executive Raveen Jaduram told 1 NEWS there are over 200 overflow points in the catchment, which they aim to reduce to 10.

"Every time it rains, the rain brings with it some contamination," he says.

"Aucklanders have said they want their beaches to be clean. They want their waterways to be clean.

"The individual property owners who end up with diluted sewage in their backyard every time it rains, they definitely want the problem fixed."

Watercare is partnering with infrastructure firm Ghella Abergeldie Joint Venture to deliver the project by 2025.

Work is expected to begin this year.

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    A billion dollar project to bring clean waterways to Auckland was signed off today. Source: 1 NEWS