Combined Sewer Overflow (CSO) Public Notification System
CSOs happen during wet weather events like snow melt or rainstorms. During these events, there is too much wastewater for the combined sewer system to hold. The wastewater is a mix of rain or snow melt and the used water that goes down the drain.
This extra wastewater does not go to the treatment plant. Instead it flows into the river, to protect residents from basement flooding.
The CSO Master Plan outlines how the City will reduce the impacts of CSOs on the environment and our residents. This includes the development of the Combined Sewer Overflow Public Notification System.
Every hour, the system gathers and processes weather, sewer, river, and rainfall data. The system then tells us if:
- An overflow is happening, almost in real-time
- An overflow notice will remain for up to 12 hours following the end of an overflow event.
- If an overflow might occur over the next 12 hours
With this information, residents can enjoy Winnipeg’s rivers while avoiding overflows.