Farmers put pressure on Labour's water taxby Anusha Bradley
The party's plan to charge farmers one or two cents for every 1000 litres they use is being attacked as unfair and likely to take money out of local communities.
Farmers are planning to protest in the dairying town of Morrinsville where Labour leader Jacinda Ardern grew up.
Central Otago farmers have told RNZ they cannot afford a tax on irrigation and it could drive some off their land.
National leader Bill English said Labour's tax could cost farmers up to $50,000 a year - which Labour water spokesperson David Clark described as "scaremongering".
Agricultural economist Peter Fraser said irrigated water accounted for 80 percent of all water consumed in this country and farmers who used it should pay.
Mr Fraser, a former Treasury economist, said if a farmer did pay $50,000 a year in tax, at two cents per 1000 litres, they would be using the same amount of water as 31,250 people.
"Irrigation is the biggest use of water in New Zealand bar absolutely nothing ... so that's an issue we do need to be talking about."
Labour's policy, while not clear cut, had opened up that discussion, Mr Fraser said.
He advocated applying a water tax to everyone, similar to GST.
Labour wants to use the money from its water tax to clean up dirty rivers but Mr English has said the tax targeted the wrong people as there were still dirty rivers in less irrigated areas.
But Labour water spokesperson David Clark said it was "absolutely fair" that people who used a public resource like water paid back a royalty to the public.
The tax would cost dairy farmers just one percent or less of their revenue, he said.
Irrigation New Zealand calculated a typical family farm of about 200 hectares could face a $24,000 bill under Labour.
The party needed to give more details about its proposal, Irrigation New Zealand chief executive Andrew Curtis said.
"The reality is going to decrease the spend in the local communities ... we see this every time there we have a downturn in a commodity price."
Mr Curtis said a a typical family farm of about 200 hectares could face a $24,000 bill.
Several water academics and rural economists declined to comment on Labour's proposal because it was too political.
This article was originally published by RNZ.
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