Protected Before
The Storm Hits.
Basement flooding causes tens of thousands of dollars in damage — and most of it is preventable. Jumbo Plumbing installs and services sump pumps, battery backups, backwater valves, and complete flood protection systems for St. Thomas and London, Ontario homeowners.
Why SW Ontario Basements Flood
Understanding your risk is the first step to protecting your home and investment
Basement Flooding
Heavy rain, rapid snowmelt, and high water tables push groundwater through cracks, window wells, and floor drains into basements.
Power Outages During Storms
The worst flooding happens during storms — exactly when the power goes out and your primary sump pump stops working.
Sewer Backups
During extreme rainfall, municipal sewer systems can back up into homes through floor drains and toilets.
Sump Pump Failure
Pumps wear out — often quietly. A failed pump discovered during a storm means flooding before you can respond.
Spring Thaw Events
SW Ontario's freeze-thaw cycle saturates soil rapidly. Ground that can't absorb fast enough pushes water against foundation walls.
Aging Foundation Cracks
Small foundation cracks widen over time. Water takes the path of least resistance — into your home.
Common Signs You Need Us
Most basement floods are preventable — but only if you act before the storm arrives. Check your list now.
Basement has a musty or damp smell
Sump pit is always full — pump rarely runs
Pump hasn't been tested or serviced in 2+ years
You've had a basement flooding event before
Pump is 7 or more years old
No battery backup system installed
Water stains visible on basement walls or floor
Wet or soggy patches in yard near foundation
Pump cycles on and off rapidly or runs non-stop
Power outages are common during storms in your area
Ticked even one item? Time to get protected before the next storm.
Our Flood Protection Services
Layered protection for your basement — from primary pumps to full backup and prevention systems
Sump Pump Installation
Primary submersible sump pump installation with proper pit sizing, discharge line routing, and check valve to prevent backflow.
Battery Backup Systems
DC battery backup or water-powered backup pumps that activate automatically if primary pump fails or power goes out.
Backwater Valve Installation
One-way sewer valve prevents municipal sewer backup from entering your home. May qualify for municipal subsidy in London and St. Thomas.
Pump Repair & Service
Float switch replacement, motor repair, discharge line clearing, and annual maintenance to keep your system running reliably.
Flood Risk Assessment
A licensed plumber evaluates your home's current protection level and recommends what's appropriate for your property and risk.
Alarm & Monitoring Setup
High-water alarms and smart monitoring systems alert you by phone if water rises in your sump pit — day or night.
Assess. Recommend. Protect.
Every home is different. We build a protection system that fits your actual risk, not a one-size solution.
Risk Assessment
We inspect your basement, pit, current pump (if any), foundation, and drainage patterns to understand your actual flood risk and existing gaps.
Custom Recommendation
Every home is different. We recommend the right system — primary pump, backup, backwater valve, or a combination — based on your specific situation.
Expert Installation
Sump pit properly sized, pump installed level, discharge routed correctly away from the home, check valve fitted, and all connections sealed.
Test & Hand Off
We fill the pit and test every component — primary pump, backup activation, and alarm — before we leave. You'll know exactly how your system works.
St. Thomas & London Homeowners: Get Up to $5,750 Back
Both the City of St. Thomas and the City of London offer basement flooding grant programs that cover up to 90% of the cost of sump pump installation, weeping tile disconnection, and backwater valve installation. You could offset a significant portion of your flood protection investment — but you must apply before work begins.
Sump Pump & Flood FAQs
Related Services
Don't Wait for a Flood.
Protect your basement before the next storm. Book a flood risk assessment or sump pump installation in St. Thomas or London, Ontario today.