According to the winnipeg website
http://www.winnipeg.ca/WaterandWaste/sewage/systemOperation.stm our sewage flows into combined sewers which are then carried by interceptor sewers to a treatment plant. the waste is then transported back to the river. The water isn't treated when wet weather creates over flows of the sewer. the sewage than finds its way into our rivers untreated. the site says "Combined sewer overflows occur an average of 18 times during the open water recreational season (May 1 – September 30)."
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