Thorold 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
Peel St SPS CSO
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Oct 9, 20171.271 Heavy Precipitation
Peel St SPS CSO
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Aug 4, 20170.163 Heavy Precipitation
Peel St SPS CSO
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May 5, 20174.272 Heavy Precipitation
Peel St SPS CSO
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May 1, 20170.052 Heavy Precipitation
Black Horse SPS
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May 1, 2017N/A Heavy Precipitation
Peel St SPS CSO
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Apr 20, 20171.539 Heavy Precipitation
Peel St SPS CSO
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Apr 6, 20172.579 Heavy Precipitation

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

Historical Overflow Data for Thorold

201620152014
Total Overflows: 1
Total Volume: 0.190
Total Overflows: 2
Total Volume: 0.259
Total Overflows: 1
Total Volume: 1.237

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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