Scarborough Plumbers | Who Actually Know Your Neighborhood

Frequently Asked Question

• 1. My home is in a former wetland or low-lying part of Scarborough. Why does that matter for flooding?

  Because the land remembers what it used to be. Many low-lying parts of Scarborough were natural wetlands before development, so the water table sits higher, the soil stays saturated longer, and water still collects toward that low ground even with homes and streets on top. That means more or less constant groundwater pressure against your foundation and a higher chance of pooling in heavy storms. The systems that keep water out, grading, weeping tile, and a working sump pump, matter more here, and an inspection shows how exposed your lot is.

• 2. Why does my Scarborough basement seep water even without a burst pipe?

  The water is coming from outside the foundation, not a fixture. Scarborough’s clay-heavy soil drains slowly, and areas near the Bluffs, the Rouge Valley, and the creek watersheds sit with a higher water table, so saturated ground pushes moisture through cracks and porous concrete, and older bungalows with aged weeping tile are especially prone. A water leak detection visit confirms it is groundwater and shows where it is entering, pointing to grading, weeping tile, or a sump pump rather than a pipe repair.

• 3. Why does my basement take on water during spring thaw?

  Winter snowpack melts faster than Scarborough’s clay can absorb, and with an already high water table in low-lying and creek-adjacent areas the water collects against the foundation, especially on flat lots or ground sloping toward the house. It can seep in even on a dry day when the snow is simply melting. The defences that matter are grading away from the house, clear window wells, downspouts discharging several feet out, and a sump pump with a battery backup.

• 4. Does Scarborough's clay soil affect my drains and foundation?

  Yes, in two ways. The clay holds water and presses against foundation walls, driving moisture through any weak point, and it expands and contracts seasonally, cracking or sagging underground drain lines over time. In older neighbourhoods, aging clay and cast-iron pipes compound it. A sewer line video inspection shows whether your line has shifted or cracked, so the repair matches the pipe’s actual condition.

• 5. My older Scarborough bungalow keeps getting drain backups. Why?

  In the older postwar bungalows of Agincourt, Malvern, West Hill, and Clairlea, a recurring backup is usually structural. Many still run on original clay or cast-iron laterals: clay joints crack and let tree roots in, while cast iron corrodes and scales inside, and the clay soil’s seasonal movement makes it worse. Snaking clears the blockage, but a sewer line video inspection shows whether it is roots in a sound pipe or a failed lateral, so the repair targets the real cause.

• 6. Are tree roots a common cause of sewer problems in older Scarborough neighbourhoods?

  Yes, very common. Scarborough’s mature tree canopy means roots are drawn to the moisture in aging clay laterals, working in through cracked joints and growing into a mass that slowly chokes the line until a backup hits. If you are snaking the same line every few months, the pipe itself needs attention. High-pressure hydro jetting clears roots far better than a snake, and if a camera shows cracking, trenchless technology can reline it without tearing up a mature yard.

• 7. Why does sewage back up into my basement during heavy Scarborough storms?

  In an intense storm the sewer can take on more water than it was built for, much of Scarborough’s infrastructure being sized for historical rainfall, so it surcharges and pushes back through the lowest drains, the floor drain, a basement toilet, or a shower. Some older areas also still have combined sewers, and the City has named parts of south Scarborough as study areas for this. A backwater valve is the defence, closing to block reverse flow, though avoid running water inside while it is closed; if backups persist, a camera inspection shows whether your own lateral is making it worse.

• 8. Should I repair or replace my cracked sewer lateral, and will the subsidy help?

  It depends on the pipe, so start with a sewer line video inspection: cracked but intact often allows trenchless relining, while a collapsed or sagged line needs full replacement or repair. Toronto’s Basement Flooding Protection Subsidy, expanded in 2026, targets prevention measures like a backwater valve, sump pump, and home plumbing assessment, not general lateral repair, and the work must be permitted and inspected. We confirm eligibility with the City before any work.