Cover · the pipe nobody thinks about

Service line coverage: the pipe between the street and your house

There is a pipe under your front garden that you own, that you cannot see, that is as old as the house, and that will cost several thousand dollars to replace when it fails. Most Canadian homeowners do not know it is theirs until it is.

Service line cover is the endorsement written for that. It is the least discussed of the three optional water coverages and the one with the clearest boundary.

Read from primary sources · Editor-reviewed · Current as of September 20, 2026

By the waterdamagequotesca.com editorial team · Published September 20, 2026 · Last reviewed September 20, 2026 · 8 min read

3 primary sources cited on this page. How we check what is on this site

The short version

The buried pipe from the property line to your house is usually yours, even where it runs under a public road.
Service line cover pays for the pipe; sewer backup cover pays for the damage inside. They complement each other.
Roots, clay joints and frost heave are what actually kill a Canadian lateral.
A camera survey is the most informative thing you can buy for the money about an older house’s drainage.

Where your responsibility starts

The City of Ottawa puts the rule as plainly as any Canadian municipality: the property owner is responsible from the property line to the home; the City is responsible from the property line to the main sewer.

City of Ottawa, Residential Protective Plumbing frequently asked questions (PDF) · 2026

This split is why a blocked lateral can be entirely your bill even though the pipe runs under a public road. It is also the first thing to establish before anyone starts digging.

Which is a strange arrangement when you first meet it. The pipe runs under a public footpath and a public road, you cannot reach it without permission and a permit, and from the property line inward it is your asset and your bill. Most Canadian municipalities draw the line in the same place, though the exact wording is local and worth checking against your own city.

The same logic applies to the water supply line coming the other way. And IBC describes the water main case specifically: it covers “damage related to the escape of water from a broken water main”, “whether it occurs on or outside your property”.

Insurance Bureau of Canada, Water Damage and Flood Protection · 2026

IBC describes this as applying “whether it occurs on or outside your property.”

What kills a buried line

Tree roots. Roots find the moisture and the joints in older clay pipe, and then they keep growing. This is the single commonest cause in established neighbourhoods, which is to say in exactly the streets with the biggest trees.

Age and material. Vitrified clay in pre-war housing, cast iron after that, then ABS and PVC. Clay fails at the joints. Cast iron corrodes and scales.

Ground movement. Frost heave over successive Canadian winters, settlement, and nearby excavation.

Grease and accumulation. Not a failure of the pipe, but the commonest reason it stops working, and the one where the line between blockage and damage gets argued.

The warning signs are ignorable for years and then are not: a floor drain that gurgles when the washing machine empties, a toilet on the lowest level that is slow only sometimes, a patch of the front garden that is greener or wetter than the rest.

What the endorsement does and does not do

Service line cover is generally written to pay for the repair or replacement of the buried line itself — the excavation, the pipe, and reinstating what had to be dug up — rather than for damage inside the house. That is the opposite of the sewer backup endorsement, which pays for the damage inside and not for the pipe.

So the two are complements rather than alternatives, and the combination people actually want is usually both.

What to ask, in the same spirit as the other pages here:

Which lines are included? Sewer only, or water supply too? Gas? Electrical service?
Is landscaping reinstatement covered? The excavation crosses whatever is on top of the pipe.
Does it cover blockage, or only damage? A root blockage cleared by a drain company is a different event from a collapsed pipe replaced.
Is there a waiting period? Commonly yes, precisely because the warning signs run for months.
Does the pipe's age or material affect eligibility? The houses most likely to need it are the ones with clay laterals.

This site cannot answer any of those for your policy, and it does not publish what the endorsement costs, because that is set per insurer and we have measured none of it.

Finding out what you have before it fails

Two things are worth doing on a house older than about 1970, and neither requires an insurer.

A camera survey of the lateral. A drain company runs a camera from a clean-out to the street and you watch the recording. It tells you the material, the condition, and whether roots are already in it. It is the single most informative thing you can buy about a house's drainage, and it is the thing nobody buys.

Find out whether you have a backwater valve. Ottawa's FAQ notes these became mandatory in new homes after 2004 for stormwater and 2012 for sanitary, so an older house very likely has not got one. The City's own description of how to check is to look between the last branch of the sewer line and where the pipe exits the foundation.

City of Ottawa, Residential Protective Plumbing frequently asked questions (PDF) · 2026

Which is a fast way to know whether you are likely to have one: if the house is older than that and nobody retrofitted it, you almost certainly do not.

If the survey comes back badly, the municipal programmes in the cost section may contribute to the protective work even though they will not contribute to replacing the pipe.

Where this sits among the three water endorsements

It helps to hold all three in one view, because they are sold separately, priced separately and confused constantly.

The three optional water coverages, and what each one is for
Endorsement	Responds to	Pays for
Sewer backup	Water or sewage reversing up through the drainage system	The damage inside the house
Overland water	Surface water, overflowing watercourses, a rising water table	The damage inside the house
Service line	The buried pipe between the property line and the house failing	The pipe, the excavation and the reinstatement

The pattern is that a standard Canadian policy handles water that escapes inside the house suddenly, and that all three of the ways water arrives from outside the house — up the drain, across the ground, or out of a broken buried pipe — are things you have to buy.

The two things most likely to put water in a Canadian basement — a sewer backup and overland water — are both in the middle column.

The same diagram as a table

What a standard Canadian home policy does and does not cover
Status	Peril
In a standard policy	Sudden or accidental escape from indoor plumbing, heating or air conditioning
	Water damage from an appliance malfunction (not the appliance itself)
	Interior damage from a roof leak (not the worn roof)
Only if you bought it	Sewer or drain backup — optional endorsement
	Overland water — optional endorsement
	Service line / water main — optional endorsement
Not covered	Storm surge and tidal wave
	Ongoing or repeated ice dams
	Frozen pipes, where the heat was not maintained

Source: Insurance Bureau of Canada, Water Damage and Flood Protection and Insurance Bureau of Canada, Flooding and Insurance.

Questions people actually ask

Who owns the sewer pipe between my house and the street?

In most Canadian municipalities the property owner is responsible from the property line to the house and the city is responsible from the property line to the main. The City of Ottawa states exactly that. Your own city's wording is worth checking, but the split is the usual arrangement.

Does home insurance cover replacing a buried sewer line?

Not as standard. Service line cover is an optional endorsement written for the buried line itself. IBC separately describes cover for damage related to the escape of water from a broken water main, whether it occurs on or outside your property.

Is service line cover the same as sewer backup cover?

No, and they complement rather than duplicate each other. Service line cover generally pays to repair or replace the buried pipe. Sewer backup cover pays for the damage inside the house when the drainage system reverses.

How do I know if my lateral is failing?

Slow or gurgling drains on the lowest level, a toilet that backs up intermittently, or a patch of front garden that is wetter or greener than the rest. A camera survey from a drain company will tell you the material and condition directly.

Does a backwater valve help with a failing lateral?

It protects the house from a reversal, which is a different problem from the pipe collapsing. It is still worth having, and several Ontario cities part-fund it.

Where to read next

Sources cited on this page

Every figure above was read from the source it is attributed to on September 20, 2026. How we check this.