Water in Basement? Here's What to Do
Immediate steps to protect your home, plus permanent solutions to keep your basement dry.
Immediate Steps When You Find Water
Safety First
If there's significant standing water, do NOT enter the basement. Water and electricity are a deadly combination. Turn off power to the basement at your breaker box before entering.
Turn Off Power
Shut off electricity to the basement at your breaker panel. If you can't do this safely, call your utility company.
Identify the Source
Is it a burst pipe, sewer backup, or water coming through walls/floor? This determines your next steps.
Stop the Water
If from a pipe, shut off your main water supply. For groundwater, check that your sump pump is working.
Remove Water
Use a wet-dry vacuum, mop, or call a professional for water extraction. The faster you remove water, the less damage.
Document Everything
Take photos and videos for insurance claims before moving or removing anything.
Common Causes of Water in Basements
Groundwater Issues
- High Water Table
Ground water level rises during wet seasons
- Poor Drainage
Water not directed away from foundation
- Hydrostatic Pressure
Water pressure forcing through foundation
Structural Issues
- Foundation Cracks
Water seeping through wall or floor cracks
- Failed Waterproofing
Old membrane or sealant deteriorated
- Window Well Leaks
Poor drainage in window wells
Equipment Failures
- Sump Pump Failure
Pump unable to keep up or stopped working
- Clogged Drain Tile
Drainage system blocked by sediment
- Power Outage
No battery backup for sump pump
Plumbing Problems
- Burst Pipes
Frozen or corroded pipes that have failed
- Sewer Backup
Municipal system overwhelmed during storms
- Water Heater Leak
Tank failure or valve problems
Permanent Solutions for Basement Water
Interior Waterproofing System
$5,000 - $15,000Interior drain tile, sump pump, and vapor barrier system to capture and remove water before it damages your basement.
- Handles groundwater
- Works year-round
- Battery backup available
Exterior Waterproofing
$10,000 - $25,000+Excavation around foundation to apply waterproof membrane and exterior drainage. Prevents water from ever reaching your basement.
- Most comprehensive
- 25+ year protection
- Addresses root cause
Sump Pump Upgrade
$1,500 - $4,000High-capacity submersible pump with battery backup ensures water removal even during power outages.
- Power outage protection
- Higher capacity
- Alarm notification
Backwater Valve
$1,500 - $3,000Prevents sewer backups by automatically closing when water flows backwards. Essential protection for urban areas.
- Sewer backup protection
- May qualify for rebates
- Automatic operation
Related Services
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Resources & guides
Practical articles on waterproofing, foundations, and moisture—written for Ontario homeowners.