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Safety of potential freshwater St. Lawrence River swimming sites – 3rd edition

Potential Freshwater Swimming Sites Status Moderate


The bacteriological quality of sixteen sentinel freshwater swimming sites in the St. Lawrence River is considered moderate for 2017–2019. Quality varies among the sites studied, deteriorating immediately downstream of the Montreal urban area.
This state has been stable since 2003–2005 and is mainly due to the absence of major changes in bacterial contamination associated with wastewater overflow during rainy weather and discharge of non-disinfected wastewater from the Montreal area.

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