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Basement flooding? The first 10 minutes matter most

Safety, source control, and salvage — in the right order.

Last reviewed May 31, 2026 by the EveryDIY.ca editorial team

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Safety first. If anyone is in immediate danger, call 911. Smell gas? Leave the house and call your utility's emergency line — do not flip switches.

Safety first — read this before stepping in

  • Do not enter standing water if any electrical outlet, panel, or appliance is submerged. Shut off power at the main breaker first (from a dry location) or call your utility.
  • If sewage is backing up, treat it as contaminated — gloves, rubber boots, N95.

Stop the source

  • Burst pipe — close the main water valve.
  • Sump pump failure — check the breaker; check the float isn't stuck.
  • Storm/sewer backup — there's nothing you can do at the source. Move to salvage mode.

Save what you can (in this order)

  1. Electronics and irreplaceable items (photos, documents) — move upstairs.
  2. Furniture — block legs up on bricks or move out.
  3. Rugs — these are usually a loss after sewage exposure.

Get water out

  • A wet/dry vac can pull a surprising amount in 30 minutes (~$120 to rent at Home Depot or buy at Canadian Tire).
  • A sump pump or trash pump (rented) for major flooding.
  • Open windows + fans for airflow once water is gone.

Call now

  • Insurance — most policies require notification within 24–48 hours.
  • Water damage restoration company — they have commercial-grade dehumidifiers that prevent mold. Most arrive within 2–4 hours in Canadian cities.
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Editorial note. Wear appropriate PPE. When in doubt — especially with electrical, gas, or structural work — hire a licensed Canadian tradesperson. See our safety policy.