Friday, 28 April 2023 10:34

Greenpeace nitrate claims 'misleading'

Written by  Staff Reporters
Critics describe Greenpeace's claims linking cancer to nitrates in water as 'misleading'. Critics describe Greenpeace's claims linking cancer to nitrates in water as 'misleading'.

Critics say claims from environmental activist organisation Greenpeace around nitrates in South Island waterways are ‘misleading’ and ‘misinformation’.

Earlier this month, Greenpeace conducted voluntary water testing in the Ashburton and Gore regions.

Christine Rose, Greenpeace’s lead climate and agriculture campaigner, says there can be severe impacts from ingesting drinking water containing nitrates.

“Nitrate contamination is endangering rural communities’ drinking water, and can lead to increased risk of bowel cancer and preterm births,” Rose says.

However, Environment Canterbury’s director of science Dr Tim Davie states in a response to Greenpeace’s claims that the activists are misleading people in the way it presents the results.

The issue, he says, is that Greenpeace is presenting its results based off one single Danish study.

The study, performed in 2018, found there was a correlation between exposure to nitrates in drinking water and the occurrence of colorectal cancer.

However, this was a correlational study, meaning that the study was designed to see if there was a link between the two as opposed to nitrate exposure being a cause for colorectal cancer.

Davie says that using the statistics from this study, instead of New Zealand’s Drinking Water Standards, set by the Ministry of Health and Taumata Arowai, is misleading.

“For drinking water, the New Zealand Drinking Water Standards set a Maximum Acceptable Value (MAV) of 50 milligrams per litre (mg/l) for nitrate, which is equivalent to 11.3mg/l nitrate-nitrogen.”

He says this standard is based on the World Health Organisation (WHO) standard.

“A 2018 review of the science behind the WHO standard, which included the Danish study, concluded there was not enough evidence to change those limits.”

Meanwhile, Gore District Three Waters Asset Manager Matt Bayliss says nitrate levels in the region are consistent with the New Zealand Drinking Water Standards’ MAV.

“So, our testing and Greenpeace’s have returned levels well below national and international standards,” Bayliss says.

Federated Farmers vice president Wayne Langford says Greenpeace is spreading harmful misinformation with its rhetoric around nitrates in water.

“This is a new low for Greenpeace, who are using misinformation about a human health issue to prey on people’s fear of cancer and to push an anti-farming agenda,” Langford says.

“Farmers and other rural communities are drinking this water, so if there is a link we want to know about it. But we will be taking our advice from health professionals, not environmental activists.”

"Greenpeace need to be held accountable for the accuracy of the claims they are making and the information they share with the public. It’s just causing needless stress, anxiety, and division," Langford says.

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