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Health Canada downplayed the risks of a toxic pesticide. Is that the ‘tip of the iceberg’?

Documents show that Canada's pesticide regulator repeatedly ignored red flags raised by its own scientists about the health risks posed by the pesticide chlorpyrifos. Photo by Shutterstock

Critics are calling for better oversight of Canada's pesticide regulator following revelations the agency repeatedly ignored red flags raised by its own scientists about the pesticide chlorpyrifos.

Chlorpyrifos is a pesticide commonly used on crops like wheat, in greenhouses and to kill mosquitoes. It harms the nervous system and can cause brain defects in children, health effects that led the U.S. and the EU to ban it in 2021. It is currently being phased out in Canada.

"Canadians need to know that their health regulatory systems are effective and timely," said NDP health critic Don Davies. "This situation betrays that expectation."

Documents obtained by the environmental group Ecojustice and exposed by Canada's National Observer show that at least five times between 2008 and 2021, government scientists or Canada's international partners raised red flags about the health risks posed by chlorpyrifos and officials did nothing. Many of the staff who worked on the file remain at the agency.

For Bloc Québécois environment critic Monique Pauzé, the chlorpyrifos case raises questions about the ability of Canada's pesticide regulators to protect the health of Canadians when it might impact pesticide companies' profits. As the documents show, federal officials repeatedly downplayed research into the pesticide's negative health impacts and Canada's own modelling suggesting it could threaten Canadians' health.

Critics are calling for better oversight of Canada's pesticide regulator following revelations the agency repeatedly ignored red flags raised by its own scientists about the pesticide chlorpyrifos. 

Environmental groups have emphasized, however, that the problem goes deeper than a single pesticide. The years-long delays that plagued the federal government's health review of chlorpyrifos are "definitely familiar," said David Suzuki Foundation national policy manager Lisa Gue.

"It's Canada's inability to take action on pesticides, even when there are known hazards associated with them," she said. She pointed out that Canada's pesticide regulator long delayed banning neonicotinoid pesticides even after research noted their negative impact on insects and biodiversity.

The other problem is the government's decision to phase out chlorpyrifos over three years instead of banning it immediately. This approach is standard practice when it comes to regulating pesticides in Canada, despite the potential negative impacts on health or the environment, she explained.

"It's a protocol that would be patently unacceptable in any other sector. Contrast it with how Health Canada treats (product) recalls, for example," she said. "We need to move to more of a recall mentality to address bad actors in the pesticide sphere."

Pauzé agreed.

"Is chlorpyrifos the tip of the iceberg?" she asked. "We heard about glyphosate a few years ago. Now it's chlorpyrifos. What will be the next pesticide that we will be finding in our urine and our bodies … that is harmful to health?"

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