Floods occur every year in Québec. They are caused by, for example, thawing that swells rivers, or weather conditions, such as heavy rains, that directly affect the level and flow of watercourses. In the case of the St. Lawrence River, storm surges can also occur along its shores.

You can take certain steps to limit danger in the event of a flood or storm surge:

Be prepared

Always have an emergency kit on hand.

When the flood hazard is high, consult your municipality’s website, or contact your municipality, for information on the measures in place or the steps to take.

If your home is near a water body or a watercourse, monitor the level and flow of watercourses (in French only).

If your home is on the shores of the St. Lawrence River, consult the tide table for your region.

Follow prevention tips in the event of a flood threat or breaking waves

In the event of an imminent flood or a storm surge threat, take the following precautions:

  • Move your valuables to an upper floor, as well as any items that can be removed from the basement or ground floor.
  • Put chemicals or harmful products, such as insecticides and waste oil, in a safe place. When putting them back, make sure that they are out of children’s reach.
  • Block sewers in the basement to avoid backflow, in the absence of an anti-backflow valve (device that prevents the sewage from an overloaded main sewer line from backing up into the basement).
  • Plug the floor drain in the basement to reduce the amount of water that may come up through the drainpipe.
  • Place bags of sand and membranes (PDF, 70 kB) in front of each entrance and opening (doors, garage and coping) if the municipality advises you to do so.
  • Remove from your yard all objects that can be easily moved, to ensure that they are not tossed about or swept away by the waves or current. Secure all bulky objects outdoors that could be carried away by the water, posing a threat to others.
  • Protect the windows facing the St. Lawrence River with plywood.
  • Check road conditions by consulting Québec 511 Info Transports or calling 511 before setting out.

If water is threatening to flood your home:

  • Shut off the power to prevent electrocution or fire hazards. However if water is beginning to flood your home, do not shut off the power. Immediately contact Hydro-Québec at 1 800 790-2424.
  • Turn off the main gas inlet, keeping in mind that it will need to be turned back on by a specialist, and turn off the valves on propane bottles and tanks.
  • Turn off the outlet valve of the fuel oil tank, keeping in mind that the integrity of the tank will have to be verified by a specialist before it is turned back on.
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Take action during a flood or breaking waves

Take the following steps:

  • If water is beginning to flood your home, do not shut off the power. Do not touch anything! Immediately contact Hydro-Québec at 1 800 790-2424 to have the power shut off at the meter or pole.
  • Observe the safety rules if the power is shut off, particularly the following:
  • Assume that water from private wells is undrinkable and unfit for consumption, even if it seems clear and odourless. Drink bottled water. If you are unable to obtain bottled water, you can drink the well water as a last resort if it is clear, provided you boil it for at least one minute.
  • Water from local waterworks should be considered safe and fit for consumpton unless the municipal waterworks authorities inform you otherwise. In case of uncertainty (odd taste, smell or colour), boil the water for at least one minute before using it. 
  • Do not try to retrieve objects swept away by the waves or current, as you could be swept away as well.
  • Before setting out, check road conditions at www.quebec511.info, or by calling 511. 
  • Avoid walking or driving on flooded roads. Abandon your vehicle if the water level causes the engine to stall, to avoid being swept away.
  • Inform the authorities of any hazardous situation, such as downed power lines on the road or heavy objects swept away by the current.
  • Consult the media in your area to obtain a status report and find out about the procedures to be followed.
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Evacuate your home

If the authorities require it or you believe your safety is in jeopardy, evacuate your home. Inform your family or the municipality of the place where you plan to stay temporarily.

Return to your home when authorized to do so

If the authorities allow it and your safety is not jeopardized, return to your home, preferably during the day, when problems and hazards are easier to see. When you arrive, take pictures to document the damage to your home.

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