St. Catharines Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
July 01, 2017 to June 30, 2018.

CSO Location Date of OverflowVolumeReason for Overflow
Port Weller Plant
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May 22, 20180.862 Heavy Precipitation
Port Dalhousie Plant
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May 22, 20182.315 Heavy Precipitation
Port Dalhousie Plant
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May 15, 20182.345 Heavy Precipitation
Port Weller Plant
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May 15, 20180.432 Heavy Precipitation
Jordan Valley SPS
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Apr 16, 20180.027 Heavy Precipitation
Snow Melt
Port Weller Plant
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Apr 16, 201895.264 Heavy Precipitation
Snow Melt
Port Dalhousie Plant
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Apr 16, 2018164.127 Heavy Precipitation
Snow Melt
Port Dalhousie Plant
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Apr 16, 201862.591 Heavy Precipitation
Snow Melt
Port Weller Plant
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Apr 15, 201851.175 Heavy Precipitation
Snow Melt
Port Weller Plant
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Apr 4, 20181.189 Heavy Precipitation
More

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

Historical Overflow Data for St. Catharines

201720162015
Total Overflows: 69
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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