Drain & Basin Services in Toronto: Catch Basins, Yard Drains, Floor Drains, and Water Control
Catch basins, yard drains, and exterior drain basins collect surface water and route it through a piped system to grade or storm sewer. Annual maintenance is the difference between flooded yards and dry ones.
Published February 25, 2026 · Last updated April 26, 2026
Introduction
Catch basins, yard drains, and exterior drain basins are the often-forgotten plumbing infrastructure that keeps water away from your foundation during heavy rain. When they fail — clogged grate, cracked walls, root-intruded outlet — water pools at the foundation, hardscape settles, and basement seepage becomes the surface symptom of an underground drainage problem. This guide explains what each component does, the annual maintenance that prevents failure, and the City of Toronto stormwater rules that govern where they can discharge.
Related services for this guide
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Project photos related to this guide
These real project photos help show what this kind of work looks like in the field, not just on the page.
Basement drain tie-in in progress
This project photo shows the below-floor drain installation phase, where route changes, tie-ins, and access all affect the actual scope of the work.
Backwater-valve access finished after concrete patch
This result photo shows the finished access point after basement flood-protection plumbing was installed and the floor was restored.
Crew working in a deep sewer-line excavation
This proof photo shows the access and installation phase of a buried sewer-line job after excavation opened the damaged section for replacement work.
Read next in this topic
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Quick answer
Catch basins, yard drains, and exterior drain basins collect surface water and route it through a piped system to grade or storm sewer. Annual cleaning is required — accumulated leaves, grit, and root mats are the primary failure mode. Replacing or repairing a catch basin in Toronto typically runs $1,800–$4,200 depending on depth and access. Yard drains must terminate at grade or an approved storm location; never the sanitary sewer (Toronto Sewer Use Bylaw).
What every Toronto homeowner should know
Catch basins must be cleaned annually — accumulated leaves, grit, and root mats are the primary failure mode.
Yard drains must terminate at grade or an approved storm location; never the sanitary sewer (Sewer Use Bylaw, Ch. 681).
Failed catch basin grates, cracked walls, or root-intruded outlets are the most common repairs we see in Toronto.
Pavement settling around a catch basin often points to a collapsed sub-grade — repair before paving over.
Some Toronto neighbourhoods discharge to a storm sewer; others surface-discharge to swales — depends on the lot.
Exterior drain basins (driveway pits, area drains) typically need cleaning twice a year — spring and late fall.
Toronto stormwater management uses a combination of catch basins, swales, and bioretention; check what your lot has.
Drain components and what each does
| Component | What it does | Typical service / repair cost |
|---|---|---|
| Floor drain (basement) | Collects accidental indoor spills, washing machine overflow | Snake/clean $189–$350; replace $450–$900 |
| Catch basin (driveway / yard) | Collects surface stormwater from paved or graded surface | Clean $250–$450; replace $1,800–$4,200 |
| Yard drain (lawn) | Collects surface water from low-spot areas in the yard | Clean $180–$320; replace $850–$2,400 |
| Area drain (window well, stairwell) | Collects water from below-grade entry points | Clean $150–$280; replace $650–$1,800 |
| Roof drain / scupper | Routes roof water to gutter or downspout | Clean $120–$240; replace varies by roof type |
Annual clean vs repair vs replace
Annual cleaning is enough when
Components are intact (no cracks, no settling), grates are functional, downstream piping flows. Most basins need 1–2 cleans per year to stay functional.
Repair or replace when
Cracked basin walls (water leaks into surrounding soil instead of flowing out the outlet). Settled or collapsed pavement around basin. Root intrusion at outlet that snaking can't clear permanently. Grate broken or missing (safety + debris ingress).
What we recommend on the visit
Camera the outlet from the basin to confirm the downstream piping is intact and flowing. Inspect the basin walls and grate. Quote cleaning if all that's needed; quote spot repair or full replacement when the camera shows otherwise.
Toronto stormwater rules and yard drainage
Toronto Sewer Use Bylaw (Ch. 681) prohibits yard drain and catch basin discharge to the sanitary sewer. Approved discharge: to grade (where the property allows surface drainage to street/swale) or to a connected storm sewer where the property has one. Many older Toronto homes discharge yard drains improperly to the sanitary lateral — this contributes to combined-sewer surcharge during heavy rain and is a code violation. We assess and re-route during yard drain repair work where it applies. Toronto's stormwater management approach has been moving toward source controls (rain gardens, permeable hardscape) — relevant when planning new yard drain installs.
Where to go next
Service page with full scope: clean, repair, replace catch basins and yard drains.
When unsure whether downstream piping is intact — camera the outlet.
Full drain and sewer services category.
Sources cited in this guide
Ready to book a drain basin service
Book at Drain & Basin Services. For diagnostic of downstream piping, Drain Camera Inspection. Calls go through 647-784-8448.
Common questions about Toronto drain basins
How often should I clean my catch basin?
Once a year minimum; twice a year for basins under heavy tree-debris load (especially in fall). Cleaning takes 30–60 minutes.
Why is water pooling around my catch basin instead of going in?
Three common causes: clogged grate (clean it), pavement settled around the basin (sub-grade collapsed, needs repair), or downstream piping blocked (camera and clean). All three are diagnosable on a single visit.
Can I drain my yard drain to the floor drain?
No — that's a Sewer Use Bylaw violation in Toronto. Yard drains must discharge to grade or storm sewer. Connecting yard drainage to the sanitary sewer overloads the system during rain and contributes to basement back-flow events in your neighbourhood.
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