Niagara Falls 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
Niagara Falls Plant
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Apr 30, 2020 0.374 ML Heavy Precipitation
Dorchester Rd SPS
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Apr 30, 2020 0.900 ML Heavy Precipitation
Central SPS
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Apr 30, 2020 0.994 ML Heavy Precipitation
Niagara Falls Plant
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Apr 30, 2020 6.244 ML Heavy Precipitation
Niagara Falls Plant
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Apr 13, 2020 0.910 ML Heavy Precipitation
Dorchester Rd SPS
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Mar 29, 2020 0.050 ML Heavy Precipitation
Central SPS
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Mar 29, 2020 0.160 ML Heavy Precipitation
Niagara Falls Plant
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Mar 29, 2020 0.032 ML Heavy Precipitation
Niagara Falls Plant
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Mar 29, 2020 1.424 ML Heavy Precipitation
Niagara Falls Plant
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Mar 28, 2020 0.006 ML Heavy Precipitation
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Historical Overflow Data for Niagara Falls

201920182017
Total Overflows: 105
Total Volume: 373.224 ML
Total Overflows: 72
Total Volume: 487.734 ML
Total Overflows: 128
Total Volume: 834.104 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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