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Water Quality

Mississauga’s drinking water comes from Lake Ontario, which is fed by rivers and streams. When it rains or the snow melts, water flows from properties and roadways into the storm drainage system and then into local waterways. Almost half of the land in Mississauga (48.4%) is either paved or has buildings on it, which prevents water from soaking into the ground and increases runoff into rivers, streams and Lake Ontario. This causes increased flooding, erosion and pollutants entering watercourses. We can protect our water through various stormwater management techniques including ponds, bioswales and rain gardens.

Lake Ontario beaches in Mississauga were safe to swim 90% of the time in 2014.

Beaches along the Lake Ontario waterfront in Mississauga are inspected and the water is tested at a minimum of once per week by Peel Public Health. Three beaches are tested in Mississauga: Jack Darling, Richard's Memorial and Lakefront Promenade.

Managing Water Quality

The City of Mississauga helps manage water quality through a number of different programs.

  • The City of Mississauga requires that new developments use and/or contribute to stormwater management measures, such as ponds, rain-gardens and bioswales, to ensure runoff entering rivers, streams and Lake Ontario is as clean as possible and that we don’t increase the risk of flooding.
  • City parks and facilities install low impact development techniques which work with nature to manage stormwater at the source (e.g. rain gardens and permeable pavement).
  • O’Connor Park directs its stormwater runoff to a collection system which helps maintain the water balance to the wetland. The park also has a subsurface infiltration system below the soccer fields, rainwater recycling, permeable pavement and a bio-swale to capture runoff from the parking lot.

Resources/Further Reading