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This guide outlines steps that you and your family can take right now to best ensure that you are prepared for flood emergency events in your community. View and Download.



Flooding happens when too much stormwater (rain or melted snow) collects in one place and can't drain fast enough or go where it's supposed to go to drain. Flooding can happen at any time of year. Visiting Improving Your Property's Drainage will help you safely direct stormwater on your property. As a property owner or manager, preparing for emergencies and being aware of flood risks is an important responsibility.

Winter and spring thaws

The risk of flooding is most likely in the winter and spring. During these seasons, the ground is still covered with snow but the air temperature is above freezing and rapid melting can become a problem. Rain can make this situation worse. Snowmelt and rain cannot be absorbed by the frozen ground and a large amount of water flows directly into the stormwater drainage system all at once. Snow piles can stop stormwater from draining properly and can send it in the wrong direction.


In spring, summer and early autumn, the air is warmer and can hold more moisture. Thunderstorms during these seasons can often produce a lot of rain very quickly, again overloading the city's stormwater drainage system.

Preparing for a flood

You can help reduce the risk of flooding and its effects by being aware and prepared. Here are a few tips:

In your home

  • Have a sump pump installed or a portable pump available in case water seeps into your basement. Sump pumps automatically collect water from your foundation drains and help re-direct it to the nearest available drainage system. Learn more.
  • Have a wet/dry vacuum available.
  • Store your valuables upstairs or on high shelves.
  • Have a battery or crank radio available in case of power loss.

Read more - Tips for Residents During a Flood


  • Move snow and ice at least two metres (six feet) away from your home's foundation.
  • Clear ice, snow and litter away from city drains and catchbasins.
  • Report any blocked catchbasins, creeks or culverts to 3-1-1 (or 905-615-4311 if outside the city).
  • Stay away from creeks, rivers and crossings, as water levels can quickly rise.

On the road

  • Stay informed of weather and road conditions. For updates: download the City of Mississauga’s Roads App; check in on the City website; follow us on social media (Twitter).
  • Park vehicles on high ground where possible.
  • Do not drive, walk or bike through moving water. Water that seems shallow can disable a car. If you have to travel, follow detour signs.

After a Flood

If you do have water damage to your property, there are resources available to help you:

What the City is doing

The City works hard to reduce the risk of flooding and keep everyone safe. The City continues to build new infrastructure to manage the increasing amounts of stormwater. When communities have experienced flooding and basement water issues, the City investigates and takes steps to better understand and, where possible, make improvements to the system. New projects are underway to solve problems and improve drainage.

Cooksville Creek flooding

After the Cooksville Creek area flooded in 2009, the City created a Task Force and started the Cooksville Flood Evaluation Study Master Plan Environmental Assessment. The goal of the study was to find solutions to reduce flooding on properties. For more information about the task force and the study, visit here or call 3-1-1 (905–615–4311 outside city limits).

Cooksville Creek flooding solutions

The City has started construction of a large holding pond on Matheson Road. The City is also building a flood protection barrier for Rhonda Valley Boulevard and improving road crossings over the Cooksville Creek at King Street and Paisley Boulevard.

The City also partnered with the Region of Peel and Credit Valley Conservation to reach out and work with local residents, including drainage studies at hundreds of homes.

Lisgar Basement Water Infiltration Investigation

Homes in the Lisgar area have experienced water coming into their basements following rainfalls. The City investigated with the help of expert consultants to find the cause.

A number of community meetings were organized by the Ward Councillor. On March 26, 2015 the consultants presented the results of their study, the Lisgar District Basement Water Infiltration Investigation - Summary Report (March 2015). In October of 2017, a follow up meeting was conducted to update residents on this investigation. View the presentation slides

Council has approved an action plan to fix the basement water issue.

For more information, visit the Lisgar Basement Water Infiltration Investigation page or call 3-1-1 (905–615–4311 outside city limits).

Little Etobicoke Creek Flood Evaluation Study

The City of Mississauga is undertaking a flooding evaluation study of the Little Etobicoke Creek watershed. Two Public Information Centres (PICs) will be held to present information related to the study and answer any questions. Details regarding PICs will be advertised publicly and communicated directly as the study progresses.


Malton Flood Mitigation Study – Etude Drive to Justine Drive

The City is undertaking a flood mitigation study for the general area between Etude Drive and Justine Drive in the Malton community. A public information centre (PIC) will be held to present information related to the study and answer any questions. Details regarding the PIC will be advertised publicly and communicated directly as the study progresses. A community site walk may also be held prior to the PIC to explain the project and receive local input. Details on the community site walk will be provided to those who request to be added to the study mailing list (refer to below notice).