St. Catharines Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
January 01, 2017 to December 31, 2017.

CSO Location Date of OverflowVolumeReason for Overflow
Port Dalhousie Plant
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Nov 19, 20177.977 Heavy Precipitation
Port Weller Plant
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Nov 19, 20173.618 Heavy Precipitation
Port Dalhousie Plant
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Nov 5, 20171.582 Heavy Precipitation
Port Weller Plant
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Oct 9, 20178.466 Heavy Precipitation
Port Dalhousie Plant
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Oct 9, 201739.617 Heavy Precipitation
Port Dalhousie Plant
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Oct 9, 201717.645 Heavy Precipitation
Port Weller Plant
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Oct 9, 201724.863 Heavy Precipitation
Port Dalhousie Plant
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Aug 17, 20171.137 Heavy Precipitation
Port Dalhousie Plant
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Aug 4, 20170.939 Heavy Precipitation
Port Weller Plant
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Aug 4, 20171.318 Heavy Precipitation
More

Volume is measured in megalitres. (1 megalitre = 1 million litres)

Historical Overflow Data for St. Catharines

201620152014
Total Overflows: 29
Total Volume: 163.155
Total Overflows: 59
Total Volume: 611.098
Total Overflows: 65
Total Volume: 642.698

Overflows contain mostly Storm Water

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 snow melt.

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.

Historical Data

If you require more detailed information about a specific combined sewage overflow, you can contact the water & wastewater division.


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