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Flooding in Your Home

Flooding can happen fast and without warning.  It is often triggered by melting snow and ice or by heavy or sustained rainfall or both.  Basement flooding can also be caused by home plumbing problems, sewer blockages or other back-ups.

Catch Basins

When ice and snow melts or when leaves fall at the end of summer, it is important to ensure that the run-off water around your property can easily flow into the roadside catch basins. In Mississauga, there are approximately 40,000 catch basins located throughout the City, oftentimes marked with a yellow arrow painted on the road. We ask that residents assist with keeping them clear of ice and snow in the winter and leaves and other debris during the warmer months.

Basement Flooding

To keep your basement dry, you may wish to have equipment like a sump pump and a back-up power supply (generator) to pump water out of your basement. For more tips on preparing your home for heavy rain and flooding, click here.

Special Stormwater Situations – Winter/Spring Thaws

What can residents do to be prepared for mid-winter/spring thaws and rain:

  • Stay informed of weather and road conditions - monitor local media including the City's website, follow us on social media (Twitter and Facebook) for updates on the situation
  • Have a battery or crank radio available in case of power loss
  • Clear ice and snow away from roadside catch basins; keep all drains free of blockages
  • Report any blocked catch basins to 311, 905-615-4311 if calling outside of the City
  • Remove snow and ice at least 2 metres or 6 feet away from your foundation
  • Have a wet/dry vacuum or sump pump available to remove meltwater if it flows into your basement
  • Move valuables upstairs
  • Park vehicles at a higher elevation
  • Minimize use of taps, flush toilets and dishwashers or laundry machines
  • For any travel during flooding events, follow approved detour routes only. Do not walk or drive through moving water and stay away from creeks, rivers and their crossings

During a Flood

If a flood warning has been issued by the Conservation Authority, follow these simple tips to ensure safety for yourself and your family.

City of Mississauga’s Role

The City manages rain and snowmelt runoff from public and private lands through its storm drainage system. This critical system consists of a variety of engineered inlets, pipes, ponds and outlet structures as well as the City’s natural watercourses that safely convey runoff from rainfall and snowmelt events to Lake Ontario. Ongoing City investment in the stormwater system helps to reduce the risk of flooding and protect water quality in the City and in Lake Ontario. When flooding occurs, the City responds to flooding complaints outside of buildings. When extensive flood damage has occurred causing structural damage to homes, City staff are also requested to inspect buildings that have been damaged by floodwaters.

To notify the City about flooding outside your home or to report a blocked catch basin, call 311. When calling from outside City limits, please call 905-615-4311.

Region of Peel’s Role

The Region of Peel has jurisdiction over the sanitary sewer system in Mississauga within the Region of Peel. The sanitary sewer system conveys waste water from our homes and businesses to two treatment facilities on the shore of Lake Ontario. This sewage receives mechanical, chemical and biological treatment prior to discharge into the lake. 

To contact the Region concerning flooding inside your home, call 905-791-7800.

Conservation Authorities and the Ministry of Natural Resources

The local Conservation Authorities (Credit Valley, Toronto and Region Conservation Authority and Conservation Halton) monitor stream flows and water levels in local watercourses to provide flood advisories to the public through their web sites and to local municipalities for flood response. Flood monitoring is also undertaken by the Provincial Ministry of Natural Resources and advisories are issued to Conservation Authorities and for smaller communities. The Provincial Ministry of Natural Resources and local Conservation Authorities also work together on flood forecasting.

After a Flood

There are some important safety considerations for you and your family to deal with in returning to a flooded home. Be aware of the following additional risks that often result from basement flooding:

  • Electrical shock (water and electricity are a deadly combination)
  • Natural gas leaks
  • Structural damage
  • Carbon monoxide from portable generators, pumps and heaters
  • Mould
  • Bacteria, viruses and chemicals in floodwater

Click here for tips on what to do if your home has been flooded.

window looking out on rain on an urban street

The City's Role

How can I prevent surface drainage from flooding my basement? +

What can I do to prevent home plumbing leaks from ruining my basement? +

How do I reduce the risk of groundwater seepage from flooding my basement? +

What should I do if sewage is getting into my basement from my floor drain? +

How do I begin a private Insurance claim?+

How do I make a claim against the City? +

How do I make a claim against the Region of Peel? +

What about mould growth after a basement flooding? +