In today's Focus on Politics podcast, Political Editor Jane Patterson dives into the three waters debate, plumbing the depths of local governments' opposition to the centralisation of water infrastructure.

"There is near universal agreement that the status quo is not sustainable. Our three waters assets are now liabilities" - Local Government Minister Nanaia Mahuta

Water is one of Aotearoa's most precious resources and the government's embarked on an ambitious plan to better manage drinking, storm and wastewater around the country.

It says major reform is needed to avoid a significant crisis, but many mayors say they would lose control of assets their communities have built up and paid for over many years, and are questioning - or outright opposing - the proposed solution.

Listen to the full podcast

Under the reforms, ownership of storm, drinking and waste water - the three waters - would be transferred from councils to four regional entities the councils would own.

The entities would be managed by a board appointed by a selection committee, who would be appointed by representative groups, in turn appointed by councils and mana whenua.

Read more:

Independent analysis raises concerns on proposed reforms

Mahuta won't rule out forcing councils into Three Waters reforms

'Asset grab' - entrenched local opposition to Three Waters plan

The Detail: The government's water infrastructure plan

Three Waters too big to fail? National, Greens predict councils will be forced to join

Some mayors fear the effect of having little input from their elected representatives over some of the services that have been central to local government in New Zealand.

Others are concerned their hefty investments in water infrastructure are not matched by other councils who would be serviced by the same water entity, despite the government splashing $2.5bn on keeping things equitable.

Local Government Minister Nanaia Mahuta is set to respond to councils' concerns after a consultation period ended on Friday. She says she's always been open to looking at aspects of Three Waters after feedback from local government, including the governance arrangements, and would consider "refinements" but there are some bottom-line principles.

She has refused to rule out making the reforms mandatory, and her National Party counterpart Chris Luxon says the government is heading for some "ugly" politics.

"It's very obvious that the New Zealand people think these assets ... are being stolen from them, having paid for them."…

Go to this episode on rnz.co.nz for more details