Post-Flood Cleaning Checklist for Ontario Homes
Flooding — whether from Ontario's increasingly frequent severe weather events, basement sewer backups, or plumbing failures — creates a time-critical cleaning and restoration situation. The 24–48 hour window after water damage is the difference between a salvageable remediation and a mould-contaminated structural problem that requires professional remediation.
Immediate Actions (0–24 Hours)
- Document everything first: Photograph all damage before removing anything — for insurance claims
- Shut off the water source (if still active)
- Contact insurance: Many Ontario home insurance policies cover sudden and accidental water damage — report immediately
- Remove standing water: Wet/dry vacuum, submersible pump, or professional water extraction
- Begin drying immediately: Open windows (weather permitting), run dehumidifiers and fans continuously — mould begins colonizing damp materials within 24–48 hours in Ontario's climate
What to Discard (24–48 Hours)
- Porous materials that absorbed contaminated water and cannot be dried within 24–48 hours: drywall, insulation, carpet, particleboard furniture, cardboard
- Any material that contacted sewer water (category 3 / black water) — this is a health hazard and must be discarded regardless of drying
What Can Be Saved
- Solid wood furniture and flooring (if dried within 24–48 hours)
- Concrete and masonry (after thorough drying and disinfection)
- Metal items (after drying — check for rust)
- Glass, tile, and ceramic
Mould Prevention
After drying: treat all affected surfaces with a mould-inhibiting disinfectant (diluted bleach solution — 1 cup per gallon — on non-porous surfaces). Continue running dehumidifiers until the space reaches normal Ontario indoor humidity (35–45%). Monitor for mould signs for 30 days after the flood event.