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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.


Date Location Estimated
Jan. 24 1600mm combined sewer outfall located at 1 Cornish Avenue 0.92 ML Approx. 5 hours Water main break
Incident details and response
  • On January 24, 2020, a SCADA operator noticed high flow levels and a maintenance crew was dispatched.
  • At 9:10 AM, the outfall slide gate was closed and a weir overflow alarm was received at 9:38 AM.
  • The high flow was caused by a water main break at Portage Avenue and Arlington Street.
  • The SCADA CSO data indicated an overflow began at 12:48 PM and stopped at 5:55 PM.
  • The closure of the outfall slide gate appeared to have no effect on containing the overflow, possibly because of ice buildup in the outfall chamber or a failure of the slide gate.
  • The department will be investigating the cause further and make any required repairs in a timely manner.
  • The estimated volume of wastewater discharged to the Assiniboine River as a result of the water main break is 0.92 ML.
  • The incident was reported to Manitoba Sustainable Development Accident Reporting line on Friday, January 24, 2020.
Last updated: January 27, 2020