What is a lead service line?

The service line is the pipe connecting a building's plumbing to the water main in the street. In many older Canadian neighbourhoods that pipe was lead. It is usually in two parts under separate ownership: a public portion from the main to the property line or curb stop, and a private portion from there into the building. Establishing what a specific address has means checking both parts, because they can be different materials.

When did Canada stop using lead pipe for water service?

Lead was an acceptable material for pipe under the National Plumbing Code of Canada until 1975. Construction year is a prompt to investigate, not a finding: a line installed before that date may since have been replaced in whole or in part, and a line in a newer building may still connect to older infrastructure. Records and a physical check settle it; the build year does not.

How do I tell if my water service line is lead?

Find where the service enters the building, usually near the water meter. Lead pipe is dull grey, soft enough to scratch to a bright silver shine with a coin, and is not magnetic — a magnet will not stick. Joints are often bulged or wiped rather than threaded. Galvanized steel looks similar but is magnetic and does not scratch bright. This is a preliminary indication only; a licensed plumber and the water utility's own record are what confirm it.

What is the Canadian guideline for lead in drinking water?

Health Canada's maximum acceptable concentration for total lead in drinking water is 0.005 mg/L, lowered in 2019 from the 0.01 mg/L figure set in 1992. That is a guideline for water quality, not a statement about any particular property. Testing at the tap, following the sampling protocol your municipality or provincial authority specifies, is what produces a result for a specific address.

Does replacing only part of the line help?

Health Canada's guidance identifies removal of the full lead service line as the most effective and most permanent measure. Partial replacement — doing one side and leaving the other — is recognised as potentially disturbing the remaining pipe. Many municipalities coordinate the public-side replacement with the private side for this reason. Ask your municipality what its programme does and does not cover before scheduling work.

Who pays for lead service line replacement in Canada?

Ownership is split and so is responsibility, and the arrangement differs by municipality. Several Canadian cities operate replacement programmes that address the public portion at no charge to the owner when the private portion is replaced at the same time. Terms, eligibility and cost-sharing vary widely — confirm what applies at your address with the municipal water utility in writing rather than relying on what applies elsewhere.

Plumbing reference

Lead Water Service Lines

The pipe that brings water into an older Canadian home may be lead, and it usually has two owners. This page sets out how the material is identified, which record belongs to whom, and what a test result can and cannot establish.

How do you find out whether a Canadian home has a lead water service line?

Check both halves of the line. The public portion, from the water main to the property line or curb stop, is recorded by the municipal water utility. The private portion, from there into the building, is identified by a licensed plumber at the point where the service enters, usually near the meter. Lead is dull grey, scratches to a bright shine and is not magnetic. Construction era only tells you the question is worth asking.

What this means

An older home in an older service area is a reason to establish the service-line material on both sides and to test the water using the protocol your municipality specifies.

What it does not mean

It does not mean lead is present, that the water at this address exceeds any guideline, or that replacement is required. Nothing here describes the condition of a specific property.

How to verify

Request the water utility's service-line material record for the address
Have a licensed plumber identify the private-side material at the entry point
Test the water following the sampling protocol the municipality or provincial authority specifies
Request any replacement record, and confirm which side of the line it covered

The pipe has two owners

This is the part most often missed. A water service line is normally divided at the property line or curb stop. The municipality is responsible for the portion from the water main to that point; the property owner is responsible for the portion from that point into the building. The two halves can be different materials, and a record covering one says nothing about the other.

Public side — main to property line or curb stop. The municipal water utility holds the material record and is responsible for that section.
Private side — curb stop into the building. The owner is responsible; a licensed plumber identifies the material at the entry point.
A replacement may have addressed one side only. Ask which side, and on what date.
Where the utility's record says 'unknown', that is a gap to investigate — not evidence that the line is not lead.

Identifying the pipe you can see

These checks give a preliminary indication on the visible section only. They do not describe pipe buried in the ground or concealed in a wall, and they are not a substitute for the utility record or a plumber's identification.

Consistent with lead

Dull grey, unpainted surface
Scratches to a bright silver shine with a coin or key
A magnet does not stick
Soft; joints often bulged or wiped rather than threaded

Points to something else

A magnet sticks firmly — consistent with galvanized steel
Scratches to a dull grey rather than bright silver — galvanized
Warm copper tone, threaded or soldered joints — copper
Plastic pipe — a later replacement, though only for the section you can see

Note that copper pipe of certain periods may have been joined with lead-containing solder, which is a separate question from the service-line material.

What the Canadian guideline says

Health Canada's maximum acceptable concentration for total lead in drinking water is 0.005 mg/L, lowered in 2019 from the 0.01 mg/L figure set in 1992. Lead remained an acceptable pipe material under the National Plumbing Code of Canada until 1975.

The guideline describes water quality, not a property. Only a test at the tap produces a result for an address.
How a sample is taken changes the result, so follow the sampling protocol your municipality or provincial authority specifies.
Health Canada's guidance identifies removal of the full lead service line as the most effective and most permanent measure.
Partial replacement is recognised as potentially disturbing the remaining pipe — ask what a programme covers before scheduling work.

Records to request

The municipal water utility's service-line material record for the address, for both public and private sides where held.
Any municipal replacement programme record: what was replaced, which side, and on what date.
A licensed plumber's written identification of the material at the entry point.
Plumbing permits for any re-piping work, from the municipality or the provincial authority.
Previous water test results, with the sampling method used noted alongside each one.

Programme terms, eligibility and cost-sharing differ by municipality. Confirm what applies at your address in writing — see the provincial and municipal source directory.

My Observation Log

For Lead Water Service Lines

Located where the water service enters the buildingobservation

Scratch and magnet check recorded on the visible pipeobservation

Joint appearance noted (bulged/wiped vs threaded)observation

Water utility's service-line material record for the addressdocument

Licensed plumber's written identification of the private-side materialdocument

Tap water test result following the specified sampling protocoldocument

Any replacement record, and which side(s) it covereddocument

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Evidence note

Sources

Jurisdiction

Canada (federal drinking-water guideline; service-line ownership, replacement programmes and plumbing permits are municipal and provincial)

Applies to

Canadian homes connected to a municipal water supply, particularly in service areas developed before 1975

Last reviewed

2026-09 (sources checked 2026-09-03)

Limitations

This page describes how a material is identified and which records exist. It does not establish what is present at any address, does not interpret a test result, and publishes no cost figures. Replacement programme terms differ by municipality and change over time.

What you should verify

Request the water utility's service-line material record, have a licensed plumber identify the private-side material, and test the water using the sampling protocol your municipality or provincial authority specifies.

Elsewhere in the network

Related sites for the parts of this that sit outside the pipe itself.

HomeCosts.ca

This site publishes no cost figures; use written quotes and wider cost planning there.

CalgaryNeighbourhoods.ca

Neighbourhood profiles, useful where service-line age tracks the age of the service area.

RealPartners.ca

Working with a representative when a finding affects an offer or a condition.