Niagara Falls Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
July 01, 2025 to June 30, 2026.

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

CSO Location Date of Overflow Volume (ML) Reason for Overflow
S.S. High Lift Sewage Pumping Station Jun 26, 2026 1.133 ML Heavy Precipitation
Central Sewage Pumping Station Jun 26, 2026 1.429 ML Heavy Precipitation
Bender Hill Sewage Pumping Station Jun 26, 2026 1.589 ML Heavy Precipitation
Muddy Run Sewage Pumping Station Jun 26, 2026 0.364 ML Heavy Precipitation
Dorchester Rd Sewage Pumping Station Jun 26, 2026 0.658 ML Heavy Precipitation
Seneca St Sewage Pumping Station Jun 26, 2026 0.245 ML Heavy Precipitation
Drummond Sewage Pumping Station Jun 26, 2026 0.417 ML Heavy Precipitation
Niagara Falls Plant Jun 25, 2026 5.480 ML Heavy Precipitation
Niagara Falls Plant Jun 25, 2026 15.137 ML Heavy Precipitation
Niagara Falls Plant Jun 22, 2026 2.490 ML Heavy Precipitation
More Locations

Historical Overflow Data for Niagara Falls

202520242023
Total Overflows: 83
Total Volume: 211.683 ML 		Total Overflows: 106
Total Volume: 486.519 ML 		Total Overflows: 112
Total Volume: 410.216 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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