Edmonton has a long history of summer storms that flood basements, including the July 2004 storm that dropped intense rain and hail across the city. Short, violent thunderstorms can deliver more rain in an hour than drainage systems are designed to carry, and when that happens, water finds the lowest point it can: your basement. EPCOR continues to invest in flood mitigation across the city, but individual homes still flood every year. Here’s why, and what to do.
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Three Ways Storm Water Gets Into Edmonton Basements
1. Sanitary sewer backup (through the floor drain)
Heavy rain can get into the sanitary system and overload it. When pipes surcharge, sewage flows backwards and up the lowest drain, usually the basement floor drain. This is Category 3 water. A backwater valve is the main defence; see the EPCOR backwater valve subsidy.
2. Overland flooding (through windows, doors and walls)
When streets and yards can’t drain fast enough, surface water pools against the house and flows in through window wells, walkout doors and foundation cracks.
3. Groundwater and weeping tile overload
Saturated soil puts pressure on foundations. If weeping tile is clogged or the sump pump can’t keep up, water seeps through the floor-wall joint and cracks.
What to Do During and After a Storm Flood
- Stay out of standing water near electrical. Shut power to the basement from a dry location only.
- If water is coming up the floor drain, stop using water in the house: no flushing, showers or laundry.
- Don’t remove the floor drain cover or try to plug it under pressure.
- Photograph everything: the water level, the source, damaged contents.
- Call your insurer. Sewer backup and overland flood are typically separate coverages. See our claim documentation guide.
- Call for professional water damage restoration. After big storms, many homes are hit at once, so call early.
- Report sewer backups to EPCOR. It helps them track problem areas.
What Restoration Looks Like
- Extraction of standing water and sewage
- Containment for Category 3 water so contamination doesn’t spread upstairs
- Removal of carpet, underlay, drywall (usually a 2–4 foot flood cut) and insulation that touched sewage
- Cleaning and disinfection of concrete and framing
- Structural drying with moisture verification, typically 3–5 days
- Rebuild of the developed basement
Expect $8,000–$20,000 for a clean-water developed basement flood and $12,000–$35,000+ for sewer backups with rebuild. See Edmonton cost guide.
Protect Your Home Before the Next Storm
| Upgrade | Protects against |
|---|---|
| Backwater valve | Sanitary sewer backup |
| Downspout extensions / disconnection | Overland water and foundation seepage |
| Proper lot grading | Overland water |
| Window well covers | Rain pooling into window wells |
| Sump pump + battery backup | Groundwater during power outages |
| Water sensors with phone alerts | Catching water early |
EPCOR’s RainWise program can help pay for downspout and stormwater projects. Details in Edmonton flood rebates.
Don’t Ignore the Smell Afterwards
If a basement was only partly dried, a musty smell weeks later is a sign of hidden moisture and possibly mould. Read musty basement and mould in Edmonton.
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