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166 Dundas St W, Mississauga, ON L5B 2N6, Canada
Lisgar, Mississauga · L5N
Northwest-corner subdivisions where groundwater sits close to the surface and the sump pump is the most important appliance in the house.
Answered live 24/7 · Free inspection · No obligation
Know the neighbourhood
1990s subdivisions in the far northwest, near Osprey Marsh and the Lisgar stormwater ponds. Drainage here is modern, and the ground sits low, with a documented history of groundwater problems through parts of the community.
Lisgar sits in the city's northwest corner between Ninth Line and Winston Churchill Boulevard, with Tenth Line West running through it and the Milton GO line and Lisgar GO station close by.
1990s–2000s
Detached homes, semis and freehold townhouses
Homes in Lisgar were built with sump pits and pumps as standard, and many owners have since finished their basements. That combination means the house depends on one pump to keep a lot of finished space dry. Townhouse rows also share grading between units, so water from one yard can affect the next.
The land here is flat and was farmland before it was built out, with stormwater ponds and Osprey Marsh managing runoff. When the ground stays saturated, water reaches the foundation drains steadily rather than in short bursts. The City has looked into basement water infiltration in parts of Lisgar, and homes in those pockets often see pumps running long after the rain has stopped.
Local conditions
These three conditions decide where we look first on a Lisgar call, what can be saved and where the drying equipment goes.
Parts of Lisgar sit low against the surrounding drainage. Sustained wet weather lifts the table enough to load weeping tile past its capacity.
A pump running year-round rather than seasonally wears out faster. Many failures here come down to a unit that has simply done too many cycles.
Flat, open subdivisions leave meltwater nowhere to go until the ground thaws. March is consistently our busiest month in this postal code.
Storms on record
Lisgar's risk is groundwater, not just storms. Pumps here run long after the rain stops, so a second pump or a battery backup matters more than in almost any other part of the city. A sump that has been running for years without service is the most common cause of the Lisgar calls we get.
Lisgar homeowners started reporting water in their basements in 2008, often with no storm at all. A consultant hired by the City in 2011 found the main cause in 2015: water collects in the gravel bedding of the utility trenches under the streets, and Lisgar's slow-draining soil lets it build up until it seeps into the weeping tile around nearby homes.
More than 106 mm fell across the city in a few hours. The ward that covers Lisgar alone reported 483 flooded homes. Sump pumps that normally handle the groundwater ran nonstop, and a pump that stalls in a storm like that floods a basement within the hour.
Lisgar was again on the City's list of the hardest-hit areas. Up to 170 mm fell on the worst parts of the city, on ground that was already full from July.
The City built a foundation drain collector pumping station at Cactus Gate Parkette, running since spring 2021, and planned a second at Doug Leavens Boulevard and the Lisgar channel. A further study is deciding how many more stations the district needs. In September 2025 residents asked council to speed that work up.
A call we get often in Lisgar
A call we get often here: it has rained on and off for several days, the pump has been running nonstop, and it finally burns out overnight. By morning there is clear water across the basement floor, under the carpet and into the bottom of the drywall. Because it is groundwater rather than sewage, much of the finished space can often be dried in place if we start quickly. We also check the pump, float and discharge so the same thing does not happen the next week.
Through the year
Snowmelt on flat, frozen ground has nowhere to soak in, so the water table rises fast and pumps work at full capacity for weeks.
Heavy thunderstorms on already wet ground push water into foundation drains faster than older pumps can discharge it.
Long stretches of autumn rain keep the ground saturated, and pumps that struggled in spring start failing again.
Sump discharge lines that run across the yard freeze, so water cycles straight back toward the house or the pump runs dry.
Most requested here
Groundwater entering through the sump pit or cove joint is the most common loss in Lisgar's finished basements.
Basement Flood CleanupClear groundwater can often be dried in place, which saves flooring, drywall and trim if drying starts the same day.
Structural Drying & DehumidificationRepeated small seepage in a basement that stays damp can lead to mould behind finished walls if it is never fully dried.
Mould RemediationBefore it happens
Fit a backup pump, battery or water-powered, because a single pump running year-round wears out faster than the label suggests.
Test the sump every few months by pouring water into the pit and confirming the float starts the pump.
Make sure the discharge line drains well away from the house and is not frozen or crushed in winter.
Keep finished basement walls slightly off the slab and use moisture-tolerant materials at floor level.
Local questions
Not covered here? Call and ask a restoration manager directly.
(877) 738-2893In some parts of Lisgar, a pump running often is common because groundwater sits high. It still matters, because constant cycling shortens the pump's life. Have the pump, float and check valve inspected, and add a backup so one failure does not flood the basement.
No. Clean groundwater is the lowest contamination category, so more of the finished space can usually be dried and kept. Sewage backup is handled very differently and most porous materials it touches have to be removed.
Many policies need a specific endorsement for sump overflow or groundwater, and some have limits. Check your policy wording before you need it. If you do have a loss, we document the cause and the damage so your claim reflects what actually happened.
Our average arrival in Lisgar is 55 min from the Dundas Street West base in Cooksville. A restoration manager answers live, 24 hours a day, and sends the nearest equipped truck while you are still on the line.
Next door
Every hour counts
Drywall wicks moisture upward at roughly 1 inch (2.5 cm) an hour, and mould takes hold inside 24 to 48 hours. Call now and a certified crew reaches your street tonight.
