The Government is insisting there's no change in reach on the Three Waters reform.

A Select Committee report recommended the Bill's application of Te Mana o te Wai be expanded to cover when sewage is pumped into harbours.

The legislation is going through its committee stage under urgency today - and expected to pass third reading next month.

Critics have dubbed it "Five Waters" but Labour's Megan Woods has clarified.

She says there's no increase in scope in what comes under Three Waters, and it's incorrect to call it Five Waters.

But National's Mark Mitchell says he's none the wiser over the definition of Te Mana o te Wai questioning the detail and application, and calling the bill a total disaster.

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