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166 Dundas St W, Mississauga, ON L5B 2N6, Canada
Streetsville, Mississauga · L5M
Queen Street's century buildings, river-valley lots and 1980s crescents all share one thing: the Credit River runs right past them.
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Know the neighbourhood
A historic village wrapped around the Credit River, with century homes on the older streets and 1980s to 1990s subdivisions filling the gaps. The river decides most of what happens here. Properties near the valley take surface water on top of groundwater, and the two usually arrive together.
Centred on Queen Street South between Britannia Road and the Credit River, with the river valley along the east side and Mississauga Road running through the west.
1850s–1920s core, 1970s–1990s subdivisions
Brick and frame century homes, bungalows and 1980s detached
Homes on the old village streets often have additions built over different foundations, so the join between old and new is a common leak point. The newer subdivisions around the village have poured basements, most of them finished. Many older houses have had their plumbing replaced in pieces, leaving a mix of materials.
The village sits on the terraces above the Credit River, so the land slopes toward the valley across much of the area. Rain runs downhill across lots before it reaches a storm drain, and homes lower on the slope get water from the yards above. Older streets were laid out before modern storm sewers. Some of them still rely on ditches, swales and shallow drainage that fill quickly in a heavy storm.
Local conditions
These three conditions decide where we look first on a Streetsville call, what can be saved and where the drying equipment goes.
Lots backing onto the valley collect runoff from higher ground during heavy rain. Window wells and grading carry more weight here than almost anywhere else in the city.
Rubble and fieldstone foundations on the oldest streets hold water differently from poured concrete. Drying them is a Class 4 job needing specialty equipment and extra days.
The canopy that makes Streetsville what it is also pushes roots into old laterals. Repeat slow backups here trace to roots rather than capacity.
Storms on record
In Streetsville the risk depends on where you sit on the slope more than on the river. Homes lower on a street, and older homes with downspouts tied into the ground, take the most water. A basement that stayed dry through 2024 has had a real test. One that took water once in 2024 will likely take it again in a storm of the same size.
Streetsville was one of the areas the City named as hit hardest in the August storm, when up to 170 mm of rain fell on parts of Mississauga in a single evening. The Credit River ran high below the village and the City asked people to stay off the valley trails. On the slope streets, yard runoff reached the back walls of homes faster than the ditches and swales could carry it away.
More than 106 mm fell across the city in a few hours. In Streetsville the worst of it came down the terraces toward the river, and the lower homes on each street took the runoff from the lots above them.
The 2013 storm put more than 126 mm on the region in about ten hours. Much further back, Hurricane Hazel dropped over 200 mm on Mississauga in 1954 and flooded the Credit valley, which is why so much of the land beside the river stays open parkland today.
Credit Valley Conservation regulates the river floodplain, so new building and additions near the valley need its approval. Many of the older village streets still drain to ditches rather than full storm sewers, and those are the streets where a summer cloudburst floods yards first.
A call we get often in Streetsville
A call we get often here: water showing up in the basement right where a century house meets a later addition. The two foundations settle at different rates and the joint between them opens over time. Rain finds that gap before anything else. We dry both sections separately, because the stone side and the concrete side dry at very different speeds, and we show the owner where the joint needs sealing.
Through the year
Melt from the slopes above the river reaches lower lots first. Basements on the valley side often see water before the street drains do.
Thunderstorms push runoff across yards toward the valley. Window wells on the uphill side fill and spill into finished rooms.
Leaves from the mature canopy block eavestroughs and street grates. Overflowing gutters dump water right at the foundation.
Older homes with plaster and little wall insulation freeze pipes on outside walls. Ice dams form on the low roofs of older cottages and additions.
Most requested here
Stone and brick foundations in the old village need longer, monitored drying than poured walls.
Structural Drying & DehumidificationRunoff from higher ground toward the valley floods basements on the lower side of the slope.
Basement Flood CleanupOlder homes often need plaster, trim and flooring rebuilt to match original materials after a loss.
Water Damage Repair & ReconstructionBefore it happens
Check the joint where an addition meets the original house, inside and out, every spring.
Clean eavestroughs twice in the fall, since the street trees here drop leaves late into November.
If your lot slopes toward the house, add a swale or extend grading so runoff from neighbouring yards goes around it.
Older homes should have a plumber map which sections are copper, galvanized or plastic so the weak points are known.
Local questions
Not covered here? Call and ask a restoration manager directly.
(877) 738-2893We try to save original trim, doors and flooring where they can be dried in place. Where plaster or wood has to be replaced, we match profiles and finishes as closely as possible. We photograph everything before removal so the rebuild has a reference.
Water from the slope above and from the ground below often arrive together on these lots. Check that grading moves water around the house rather than toward it, and that window wells have covers. If flooding is a concern, ask your insurer about overland water coverage as well as sewer backup.
Stone and mortar can stay wet inside even when the surface feels dry. We take readings at depth, not just at the surface. If moisture is still there, we keep drying and check for mould behind finishes before anything is sealed.
Our average arrival in Streetsville is 45 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.
