Study finds one in six New Zealanders exposed to high levels of nitrates in tap water, links to bowel cancer

A Danish study monitoring 2.7 million people over 23 years found a significant increase in bowel cancer risk at just 0.87mg/litre of nitrate-nitrogen per litre of water. At 2.1mg/litre there was a 15 percent increase. New Zealand's drinking water standard is more than five times that - at 11.

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