Niagara Falls Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
December 01, 2022 to November 30, 2023.

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

CSO Location Date of Overflow Volume (ML) Reason for Overflow
Niagara Falls Plant
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Nov 9, 2023 0.175 ML Heavy Precipitation
Central SPS
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Nov 9, 2023 0.591 ML Heavy Precipitation
Niagara Falls Plant
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Nov 9, 2023 0.967 ML Heavy Precipitation
Niagara Falls Plant
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Oct 6, 2023 0.007 ML Heavy Precipitation
Central SPS
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Oct 6, 2023 2.011 ML Heavy Precipitation
Drummond SPS
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Oct 6, 2023 0.001 ML Heavy Precipitation
Seneca St SPS
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Oct 6, 2023 0.075 ML Heavy Precipitation
Seneca St SPS
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Sep 18, 2023 0.012 ML Heavy Precipitation
Niagara Falls Plant
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Sep 7, 2023 0.025 ML Heavy Precipitation
Seneca St SPS
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Sep 7, 2023 0.069 ML Heavy Precipitation
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Historical Overflow Data for Niagara Falls

202220212020
Total Overflows: 87
Total Volume: 324.779 ML
Total Overflows: 137
Total Volume: 316.333 ML
Total Overflows: 67
Total Volume: 127.594 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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