When buried pipes fail — whether from tree root intrusion, deteriorating clay tile, or decades of ground movement — UIG excavates, repairs, and replaces the underground service laterals connecting your home to the municipal system. We handle sanitary sewer, waterline, and storm drain laterals from the municipal main at the property line all the way into the building.
Most lateral failures in older GTA neighbourhoods trace back to a handful of predictable causes. Understanding what went wrong helps us select the right repair strategy for your property.
1) Tree Root Intrusion
Tree roots seek out the moisture around pipe joints and hairline cracks. Once inside, they grow to fill the pipe, causing partial blockages, joint displacement, and eventually full collapse. Mature trees and old clay pipe joints are the highest-risk combination in older GTA neighbourhoods.
2) Deteriorated Clay Tile Pipe
Clay tile pipe was the standard for residential laterals until the 1970s. After 50+ years underground, clay becomes brittle, joints open, and the pipe can crack or collapse entirely under ground load. Vitrified clay offers no flexibility — any ground movement translates directly into pipe damage.
3) Pipe Joint Separation
Ground settlement, frost heave, and soil compaction over decades cause lateral pipes to shift and joints to separate. Separated joints allow soil to infiltrate the pipe (inflow and infiltration), accelerate root entry, and reduce effective pipe diameter over time.
4) Corroded or Failed Water Service
Lead water service pipes are still present in many pre-1955 homes across Hamilton, Toronto, and surrounding municipalities. Lead pipes corrode internally over time and create a health risk. Even copper laterals installed in the 1960s and 70s can fail due to pinhole corrosion, particularly in soils with aggressive pH levels.
05) Crushed or Offset Pipe
Heavy vehicle loads over driveways, poor original installation, or improper bedding material can crush PVC and clay laterals or cause significant pipe offset. A crush or offset blocks flow, traps solids, and typically cannot be repaired without full or partial replacement.
6) Improper Grading & Belly
A sewer lateral requires a consistent downward slope toward the municipal main to convey waste by gravity. Settling, poor original installation, or tree root lift can create a “belly” — a low point where solids and water pool. This causes chronic blockages that no amount of rodding can permanently resolve.
UIG performs the full scope of residential lateral repair and replacement — from targeted spot repairs to full service runs from the municipal main into the building.
Sanitary Lateral Replacement
Full replacement of the sanitary sewer lateral from the municipal connection at the property line through to the interior building drain rough-in. We excavate, remove failed pipe, install new PVC with proper bedding and slope, and restore the surface.
Spot Repair & Root Treatment
Where the damage is localized — a specific joint, a short section of crushed pipe, or a root entry point — we perform targeted spot repairs without full excavation of the entire lateral run.
Water Main Lateral Replacement
Replacement of the residential water service lateral from the curb stop at the property line to the water meter entry point inside the home. We obtain all required permits, coordinate with the municipality for curb-side shutoff, and restore the full excavation area.
Water Lateral Leak Repair
Full replacement of the sanitary sewer lateral from the municipal connection at the property line through to the interior building drain rough-in. We excavate, remove failed pipe, install new PVC with proper bedding and slope, and restore the surface.
Storm Lateral Repair & Replacement
Repair and replacement of storm water laterals that convey roof drainage, catch basin, and yard drainage to the municipal storm system. Failed storm laterals can cause basement flooding, pooling yards, and foundation moisture problems.
Weeping Tile & Foundation Drainage
Repair and replacement of failed exterior foundation drainage systems — weeping tile, filter fabric, and drainage composites — that protect basement walls and slabs from hydrostatic pressure and groundwater infiltration.
Combined Lateral Package
Many older properties need all service laterals addressed at once. When the excavation is already open, completing sanitary, water, and storm laterals concurrently significantly reduces overall cost, surface disruption, and restoration time compared to three separate mobilizations.
Surface Restoration
Lateral excavations pass through lawns, driveways, walkways, and sometimes roadways. UIG manages all surface restoration as part of the project scope — so you’re not left with an open trench and a separate contractor to call.
The pipe material in the ground tells us a great deal about the risk profile of your service laterals. Here's what UIG typically encounters in GTA-area residential properties.
Vitrified Clay (VCP)
Lead
Orangeburg Pipe
Cast Iron
Copper
ABS Plastic
PVC (SDR 35)
Copper / PEX
The pipe material in the ground tells us a great deal about the risk profile of your service laterals. Here's what UIG typically encounters in GTA-area residential properties.
| Material | Era | Use | Condition / Risk | Status |
|---|---|---|---|---|
| Vitrified Clay (VCP) | Pre-1970s | Sanitary sewer lateral | Brittle with age; root-prone open joints; common in municipalities before 1975 | High Risk |
| Lead | Pre-1955 | Water service lateral | Health risk due to lead leaching; soft; prone to pinhole failures | Replace Now |
| Orangeburg Pipe | 1930s–1970s | Sanitary sewer lateral | Made from wood pulp and tar; deforms and collapses; cannot be repaired | Replace Now |
| Cast Iron | 1950s–1980s | Sanitary/storm lateral & interior drains | Corrodes internally; scale buildup reduces diameter; may crack under stress | Monitor / Replace |
| Copper | 1955–1990s | Water service lateral | Long-lasting but prone to pinhole corrosion; leaks may go undetected | Inspect / Repair |
| ABS Plastic | 1970s–1990s | Interior drains; early exterior use | Generally serviceable; early batches may become brittle; inspect joints | Inspect |
| PVC (SDR 35) | 1980s–present | Sanitary and storm laterals | Current standard; resists roots; flexible joints; long lifespan | Current Standard |
| Copper / PEX | 1980s–present | Water service lateral | Modern standard; durable; code-compliant | Current Standard |
From the initial call through to surface restoration, UIG manages every step of your lateral repair — including permits, inspections, and utility locates.
Every excavation UIG performs is preceded by a mandatory Ontario One Call (1-800-400-2255) utility locate request. Gas, hydro, telephone, cable, and other buried services are marked prior to any digging. This is a legal requirement in Ontario and a non-negotiable part of our site safety protocol — we never skip it, regardless of project urgency.
Lateral repair is high-stakes work. A failed excavation, improper installation, or missed permit can mean structural damage, failed inspections, or a repeat failure. UIG brings the credentials and experience to do it right.
OCDCA Member
Our work follows Ontario Concrete and Drain Contractors Association best practices for sewer lateral installation, trench safety, and drain connection standards.
Permit Management
UIG pulls every permit required — municipal plumbing, right-of-way excavation, road cut — and manages all inspections through to sign-off. You don’t carry the compliance risk.
Camera Inspection
Ground settlement, frost heave, and soil compaction over decades cause lateral pipes to shift and joints to separate. Separated joints allow soil to infiltrate the pipe (inflow and infiltration), accelerate root entry, and reduce effective pipe diameter over time.
Union-Trained Crews
Our field crews work under the OCDCA collective agreement with LiUNA Local 183. Trained, safety-certified, and experienced in urban residential excavation throughout the GTA.
Full Surface Restoration
Lateral work tears up driveways, lawns, and sometimes road surfaces. We restore everything — concrete, asphalt, sod — as part of our project scope. One contractor, one job.
Whether you’re dealing with an active backup, a wet yard, a lead water pipe, or simply want to know the condition of your underground laterals — UIG can assess, quote, and repair. Contact us to get started.
