Canadian municipalities reported a 3.9% decrease in wastewater volumes in 2020 to 5 793 million cubic metres, following a 4.7% increase in wastewater volumes in 2019. The year 2020 marks the third decline of wastewater volumes since the start of the series in 2013. Similar to previous years, 3.7% of wastewater, including combined sewer overflows, was untreated prior to being discharged in 2020.
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