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City of Winnipeg
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Until Election Day
on October 24

Reports on untreated sewage

As requested by the Province of Manitoba, we report on the incidents of untreated sewer release into the environment as a result of a disruption to our wastewater collection system. These events are usually the result of something unanticipated like a water main break or a power outage. When sewer operations are disrupted, the sewage can be released into the environment, which helps protect public health and prevent property damage like basement flooding.


Date Location Estimated
Cause Incident details and response
March 3 Assiniboine River - Combined sewer overflow pipe located at the southwest corner of Assiniboine Avenue and Main Street. 600,000 litres 355 minutes Partial blockage in junction chamber
  • Received notification of discharge from combined sewer overflow pipe at approximately 2:40 p.m.
  • Crew arrived around 3:00 p.m. and found a partial blockage in junction chamber. Blockage caused sewage levels to rise above the sewer's overflow weir resulting in diluted combined raw sewage discharge to the Assiniboine River.
  • Estimate that discharge began at 9:25 a.m.
  • Crew removed blockage and restored normal flow.
  • Levels in sewer declined and discharge stopped at approximately 3:20 p.m.
  • River Patrol Unit notified of discharge.
  • Incident reported to Manitoba Conservation, Manitoba Environmental Accident Reporting Line and Environment Canada.

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Last updated: January 11, 2018