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City of Winnipeg
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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.


(Reporting started in November, 2004)

Date Location Estimated
Cause Incident details and response
December 22 Assiniboine River -
Olive land drainage sewer
Volume unknown. Estimate that small amount of sewage was released into the river. Duration unknown. Estimate that sewer overflowed for several days. Partial blockage of wastewater sewer at Olive and Ness
  • Maintenance inspections revealed discharge occurring from sewer outfall.
  • Crews discovered blockage and removed debris that was causing an overflow to the Olive land drainage sewer via a high level overflow.
  • Sewer levels in the area normalized and discharge ended.
  • Incident reported to Manitoba Water Stewardship and Environment Canada.
December 10 Red River -
Cockburn sewage pumping station
2000 litres 10 minutes Manitoba Hydro power outage
  • Alarm received at 5:20 p.m.
  • Small discharge occurred around 6:00 p.m. while staff were closing the gate.
  • Power restored around 8:10 p.m.
  • Incident reported to Manitoba Water Stewardship and Environment Canada.
November 27 Assiniboine River -
Ferry Road lift station
54,000 litres 15 minutes Power disruption
  • Power disruption occurred at 9:45 a.m.
  • Alarm indicators and pump controls reactivated when power restored around 10 a.m.
  • Incident reported to Manitoba Water Stewardship and Environment Canada.

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Last updated: January 11, 2018