Niagara Falls Combined Sewer Overflows at Niagara Region Facilities

Data presented here is updated every three months. The data contains records from
September 01, 2025 to August 31, 2026.

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

CSO Location Date of Overflow Volume (ML) Reason for Overflow
Niagara Falls Plant Aug 31, 2026 0.321 ML Heavy Precipitation
Niagara Falls Plant Aug 23, 2026 0.420 ML Heavy Precipitation
Dorchester Rd Sewage Pumping Station Aug 23, 2026 0.072 ML Heavy Precipitation
Central Sewage Pumping Station Aug 23, 2026 0.004 ML Heavy Precipitation
Seneca St Sewage Pumping Station Aug 23, 2026 0.080 ML Heavy Precipitation
S.S. High Lift Sewage Pumping Station Aug 22, 2026 0.104 ML Heavy Precipitation
Niagara Falls Plant Aug 22, 2026 4.542 ML Heavy Precipitation
Dorchester Rd Sewage Pumping Station Aug 22, 2026 2.168 ML Heavy Precipitation
Muddy Run Sewage Pumping Station Aug 22, 2026 0.343 ML Heavy Precipitation
Niagara Falls Plant Aug 22, 2026 14.220 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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