St. Catharines Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
March 01, 2017 to February 28, 2018.

CSO Location Date of OverflowVolumeReason for Overflow
Port Weller Plant
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Feb 25, 20181.549 Heavy Precipitation
Port Weller Plant
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Feb 23, 20180.277 Heavy Precipitation
Port Weller Plant
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Feb 21, 20181.471 Heavy Precipitation
Port Weller Plant
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Feb 21, 20187.196 Heavy Precipitation
Port Dalhousie Plant
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Feb 20, 20180.570 Heavy Precipitation
Snow Melt
Port Weller Plant
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Feb 19, 20185.188 Heavy Precipitation
Port Dalhousie Plant
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Feb 19, 20180.531 Heavy Precipitation
Port Weller Plant
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Feb 19, 201818.678 Heavy Precipitation
Port Dalhousie Plant
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Feb 15, 20186.469 Snow Melt
Port Weller Plant
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Feb 15, 201816.971 Snow Melt
More

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

Historical Overflow Data for St. Catharines

201720162015
Total Overflows: 68
Total Volume: 1285.870
Total Overflows: 29
Total Volume: 163.155
Total Overflows: 59
Total Volume: 611.098

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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