At the time, she told the Herald that the findings of the group would be put into a supplementary order paper (SOP) to amend the bill at a later stage, before it passed.
The Government had since changed its mind and would wait until the working group had finished its work to introduce the bill.
It comes as the Government faces a crisis of confidence in the local government sector, following its decision to confiscate billions of dollars of water assets from ratepayers - many councils had hoped the scheme would be voluntary, as originally advertised.
A Curia-Taxpayer's Union Poll from October found 54 per cent of voters opposed the scheme, with 19 per cent supporting. The Government has persisted despite this unpopularity.
An exposure draft of the bill would be given to the working group to inform its work.
"The issues facing New Zealand's water infrastructure are nothing less than urgent, but we must ensure the legislation is robust and fit for purpose. This process will ensure the strength of the reforms and fully take into account the feedback from the eight-week engagement period," Mahuta said.
"The Working Group will be asked to report back by the February 28, 2022, allowing the introduction of the bill shortly thereafter and to ensure the new entities are in place by July 2024," she said.
Mahuta said the exposure draft would be available "in the coming days", both to the working group, and to the public.
The delay was revealed in Parliament when shadow leader of the house Chris Bishop asked his opposite number, Chris Hipkins, whether the water bill would be introduced to Parliament before sitting wraps up next week for Christmas.
Hipkins confirmed the bill would not be introduced.
