Welland Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
May 01, 2019 to April 30, 2020.

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

CSO Location Date of Overflow Volume (ML) Reason for Overflow
Welland Plant
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Apr 30, 2020 34.894 ML Heavy Precipitation
Welland Plant
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Apr 13, 2020 21.115 ML Heavy Precipitation
Welland Plant
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Apr 9, 2020 13.368 ML Heavy Precipitation
Welland Plant
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Mar 28, 2020 49.324 ML Heavy Precipitation
Welland Plant
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Mar 2, 2020 57.649 ML Heavy Precipitation
Welland Plant
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Feb 26, 2020 7.931 ML Heavy Precipitation
Welland Plant
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Feb 18, 2020 47.190 ML Heavy Precipitation
Welland Plant
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Jan 24, 2020 73.559 ML Heavy Precipitation
Welland Plant
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Jan 11, 2020 55.145 ML Heavy Precipitation
Welland Plant
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Dec 31, 2019 7.450 ML Snow Melt
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Historical Overflow Data for Welland

201920182017
Total Overflows: 29
Total Volume: 1205.644 ML
Total Overflows: 25
Total Volume: 1422.110 ML
Total Overflows: 27
Total Volume: 1235.354 ML

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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