Hundreds of millions of litres at a time.
In 2024, a pipe failure at the Fort Garry Bridge dumped 230 million litres of raw sewage into the Red River. One of the largest spills in the city's history.
That wasn't a one-off. In 2002, the North End Water Pollution Control Centre failure dumped 427 million litres — still the largest on record. The system overflows regularly, releasing a combined 10 billion litres of raw sewage per year into the rivers and lakes of the Winnipeg region.
These aren't accidental leaks. They're built into how the system operates. Combined sewers — carrying both stormwater and sewage in the same pipe — overflow during heavy rain or snowmelt, discharging untreated wastewater directly into the Red and Assiniboine.