Data presented here is updated every three months. The data contains records from
November 01, 2017 to
October 31, 2018.
While the volume of an overflow may seem large, the amount of untreated sewage
present in the overflow is small when compared to the amount of stormwater or
Niagara typically treats about 80,000 megalitres of
sewage each year. The vast majority of wastewater discharged into the
sewer system receives full treatment and only a small percentage of this sewage
overflows. These overflows usually only occur during periods of heavy rain or
during seasonal snow melts.
If you require more detailed information about a specific combined sewage overflow, you can contact the water & wastewater division.
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