Welland Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
November 01, 2016 to October 31, 2017.

CSO Location Date of OverflowVolumeReason for Overflow
Welland Plant
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Oct 11, 20178.570 Heavy Precipitation
Welland Plant
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Oct 9, 201741.619 Heavy Precipitation
Welland Plant
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Aug 4, 201724.480 Heavy Precipitation
Welland Plant
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Jul 20, 201718.960 Heavy Precipitation
Welland Plant
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Jul 13, 201713.555 Heavy Precipitation
Welland Plant
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Jun 23, 201710.755 Heavy Precipitation
Welland Plant
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May 25, 201721.255 Heavy Precipitation
Welland Plant
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May 4, 2017152.272 Heavy Precipitation
Welland Plant
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Apr 30, 201796.278 Heavy Precipitation
Welland Plant
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Apr 20, 201751.244 Heavy Precipitation
More

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

Historical Overflow Data for Welland

201620152014
Total Overflows: 13
Total Volume: 431.554
Total Overflows: 16
Total Volume: 868.665
Total Overflows: 22
Total Volume: 1269.051

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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