Canada's volume of treated sewage by type 2017

Volume of provincial wastewater discharged in Canada in 2017, by treatment type

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Release date

June 2019



Survey time period


Supplementary notes

Primary treatment removes a portion of suspended solids and organic matter by physical and/or chemical processes.
Secondary treatment removes biodegradable organic matter and suspended solids using biological treatment processes and secondary settlement.
Tertiary treatment further removes residual suspended solids, nutrients and/or other contaminants using various physical, chemical or biological processes.
Combined sewer overflows (CSOs) are from sewers that convey both stormwater and wastewater that overflow into receiving bodies of water without treatment.
No treatment indicates wastewater discharged into water bodies without treatment. Adapted from Statistics Canada,, 2017. This does not constitute an endorsement by Statistics Canada of this product.

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