Road salt is used to keep roads clear in the winter but a researcher says municipalities should reduce the amount used due to the impact on local lakes. (Rhianna Schmunk/CBC)

An expert on road salt and its effect on waterways says municipalities need to start finding ways to reduce how much salt is used on roads in the winter. Queen’s University professor Shelley Arnott will be speaking about the topic in Sudbury on Friday.

She’s been studying the negative impact of road salt on lake habitat. Arnott says studies have shown that water in the lakes in the Canadian Shield is softer, which means it doesn’t have a lot of calcium carbonate in it. “Calcium carbonate can influence the toxicity of road salt and other contaminants like metals,” she said.


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