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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
Feb. 18 900 mm land drainage outfall located at the intersection of St. Charles Street and the Assiniboine River 0.015 ML Approx. 2 hours and 47 minutes Blockage
Incident details and response
  • On Thursday, February 18 at 3:48 p.m., a maintenance crew responded to service call reporting a high sewer level at 435 Sansome Avenue. The crew confirmed sewer level at the location was high, however no overflow was occurring at this time. It was determined the high sewer level was caused by a blockage downstream of the Sansome Avenue and Gagnon Street intersection.
  • A vacuum cleaning unit was called in and arrived on site at 7:46 p.m. to clear the blockage. The cleaning crew observed wastewater entering the high-level overflow pipe and into the land drainage sewer, located at the intersection of Gagnon Street and Sansome Avenue, which eventually flows to the Assiniboine River. The vacuum cleaning unit immediately began cleaning the wastewater sewer containing the blockage and the overflow was stopped at 8:17 p.m.
  • Although flow was observed entering the land drainage sewer on Thursday evening, it wasn’t until the following morning that a discharge into the Assiniboine River was confirmed.
  • Wastewater Services will continue to investigate the circumstances of this overflow and will make any required operational modifications to prevent a similar occurrence in the future.
  • The estimated volume of wastewater discharged to the Assiniboine River, from the time of discovery to when the blockage was cleared, is 0.015 ML.
  • The incidents were reported to the Manitoba Conservation and Climate Accident Reporting line on Friday, February 19, 2021.
Last updated: February 23, 2021

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