Local Government Minister Nanaia Mahuta has pledged to offer the Three Waters sector some certainty, acknowledging staff needed clarity and job security.

She was speaking to industry representatives at a Water NZ Conference in Christchurch on Tuesday.

"The feedback we've had is that staff want early certainty, job security and to retain and develop the skills knowledge and relationships that they will bring with them.

"It is crucial that we provide certainty to staff as early as possible. It is our current workforce who will form the foundation of the new entities."

The Three Waters sector was facing challenges with population growth, environmental regulations and climate change, she says.

"Change is urgently needed in a way we can ensure our water services are managed to meet those challenges.

"We are presented with a once in a lifetime opportunity to transform the way we deliver those services."

She says thousands of submissions have been received on the Water Services Entities Bill and a report was due to be presented to Cabinet next month.

It's just the first step in reform and there would be more opportunities for the Three Waters sector and the wider public to have a say, she says.

Management of Three Waters infrastructure was due to pass from the 67 councils throughout the country to four new water entities, under the industry regulator Taumata Arowai on July 1, 2024.

Legislation will be presented to Parliament later this year to set out the functions and powers of the four new entities, says Mahuta.

Further legislation will also establish economic regulation and "a consumer protection system".

"My goal is for this legislation to reflect international best practice and also to be uniquely tailored to Aotearoa New Zealand's local environment and context."

Part of the uniqueness will be recognising and embracing Te Mana o te Wai - the health and wellbeing of water ways.

Officials from the Department of Internal Affairs' national transition unit are travelling around the country to discuss the impacts of the reforms with local councils.

Chief executives will also be appointed for the four entities soon and will work in the DIA's national transition unit to ensure "a seamless transition" in the lead up to July 1, 2024.

Responding to a question from the audience, Mahuta says it's concerning National is criticising an "internationally credible model" without proposing a "credible alternative".

"I've been in politics a long time and seen issues put aside because they are too hard.

"We've been talking about these issues for years, but the time to act is now."

-Public interest journalism funded through New Zealand on Air.