When a water service line needs to be replaced, you have two fundamentally different approaches available: open-cut excavation, where a trench is dug the full length of the run, and trenchless replacement, where the new pipe is installed from two small access points with minimal surface disruption.
Both methods work. Choosing the right one depends on your specific property — the pipe condition, soil type, run length, and what's sitting above the line.
What Is Trenchless Water Line Replacement?
Trenchless is an umbrella term for two different techniques:
Pipe bursting is the most common method for residential water service line replacement. A hydraulic bursting head is pulled through the existing pipe, fracturing it outward into the surrounding soil while simultaneously pulling a new HDPE pipe in behind it. The result is a new, continuous pipe in the same corridor as the old one, with access pits only 2–3 feet wide at each end.
CIPP lining (cured-in-place pipe) inserts a resin-saturated liner into the existing pipe and cures it in place, forming a smooth new inner surface. This doesn't require the old pipe to be removed — it rehabilitates it from the inside. CIPP is well-suited to lines that are structurally mostly intact but leaking at joints or showing localized deterioration.
When Trenchless Is the Right Call
Trenchless pipe bursting is the preferred method for most Toronto residential service line replacements for one simple reason: the typical Toronto front yard is a paved driveway, established gardens, or a lawn that took years to grow. A full-length open trench turns that into a construction site for days.
Trenchless works best when the existing pipe is relatively straight (no extreme bends), the soil is reasonably consistent, and the run length allows efficient equipment setup. Most 20–60 foot residential runs on typical Toronto lots are good candidates.
When Open-Cut Is the Better Option
Open-cut excavation is still the right choice in several situations: when the existing pipe has already collapsed and a bursting head can't pass through, when severe root intrusion has displaced the pipe significantly, when the run has too many bends for effective trenchless equipment placement, or when access to the full pipe is needed to deal with soil contamination (common in lead pipe removal under Ontario regulations).
Open-cut is also sometimes faster for short runs where the setup cost of trenchless equipment outweighs the trench restoration cost.
How to Know Which One Applies to Your Situation
The answer starts with a camera inspection. We run a camera through the service line before any job to assess pipe condition, check for obstructions, and confirm the routing. That inspection tells us whether pipe bursting is viable, whether CIPP is appropriate, or whether the pipe condition requires open-cut.
We'll explain what we found and give you a straight recommendation. Call Toronto Water Line Replacement to schedule an inspection — it takes less than an hour and saves you from guessing.