Is Sewer Line Repair the Homeowner's Responsibility or the City's?

In Calgary, the homeowner is responsible for the sewer line that runs from the home to the point where it connects to the City of Calgary’s main sewer line. The City is only responsible for the main sewer line itself, which typically runs under the street. If the problem is anywhere between your home and that connection point, the repair cost falls on you as the property owner.

This is one of the most common misconceptions homeowners have about sewer line repair. Understanding where the line of responsibility sits before something goes wrong saves both time and money when a problem does occur.

How the Sewer System Is Divided Between Homeowner and City

Your home’s sewer system connects to the municipal network through what is called a sewer lateral. This is the underground pipe that runs from your home’s foundation out to the City’s main sewer line under the street. The lateral is divided into two sections.

The Upper Lateral

The upper lateral is the section of pipe that runs from your home out to your property line. This section is entirely the homeowner’s responsibility to maintain, repair, and replace.

The Lower Lateral

The lower lateral is the section that runs from your property line to the connection with the City’s main sewer line. This section is also the homeowner’s responsibility even though it extends beyond your property boundary and sits under a public right of way such as a sidewalk or boulevard.

This is the point that surprises most homeowners. The lower lateral is not on your property, but it is still your pipe. According to the City of Calgary, homeowners are responsible for all sewer service connections from the property line to the residential plumbing system, and all utility site servicing installations on private property must be constructed and maintained at the homeowner’s expense.

The only portion of the system the City maintains is the main sewer line itself. If a City crew runs a snake from your cleanout to the main and determines the blockage is in the public main rather than your lateral, the City will take over from that point.

How to Find Out Where the Problem Actually Is

The fastest and most reliable way to determine whether a sewer problem is on your side or the City’s is a drain camera inspection. A camera is fed through the cleanout in your basement and run the full length of the lateral to the main connection. The footage shows exactly where any blockage, crack, root intrusion, or pipe failure is located and whether it falls within the homeowner’s section or beyond it.

If you experience a sewage backup and are unsure where the problem originates, the City of Calgary advises calling 311 first. A 311 agent will ask questions to determine whether the issue is likely an internal plumbing problem or may involve City infrastructure. If 311 determines City involvement is unlikely, they will direct you to call a licensed plumber in Calgary.

It is worth noting that City crews use a steel snake run from the cleanout to the main sewer to determine whether the blockage is on private or public property. If the blockage is confirmed to be on private property, the homeowner is responsible for calling and paying for a plumber.

What Happens When the Problem Is in the City’s Main Line

When a blockage or failure is confirmed in the City’s main sewer line rather than your lateral, City wastewater crews are dispatched to address it. You will typically notice this has happened because either sewage is backing up in multiple homes on the same street simultaneously or wastewater is surfacing in the street itself rather than just within your property.

In this situation you should call 311 to report the issue. City crews will investigate and carry out repairs at no cost to you. Your responsibility in this scenario is limited to protecting your property while waiting for the City to respond, which may include shutting off water use, moving valuables away from floor drains, and documenting any interior damage for your insurance provider.

When the City Is Involved but the Cost Still Falls on You

There is one scenario that consistently surprises homeowners: even when City crews respond to a sewer backup call, if their investigation determines the cause is something originating from your property such as accumulated grease, flushed wipes, or root intrusion from trees on your land, the repair cost remains your responsibility.

This means calling 311 does not guarantee the City will cover the repair. It simply starts the process of determining where the problem lies. If it is traced back to your lateral or to household waste practices, a licensed plumber will need to be engaged at your expense.

Who Is Responsible for Sewer Line Repair in Airdrie and Okotoks

The same general principle applies across Alberta municipalities. Homeowners are responsible for the sewer lateral from their home to the connection with the municipal main. The municipality is responsible for the main sewer infrastructure itself.

For Airdrie and Okotoks homeowners specifically, the best starting point when a sewer backup occurs is to contact your municipality directly to confirm the local process for reporting and investigating backups before calling a plumber. This ensures you do not pay for a repair that may be the municipality’s responsibility.

R N T Plumbing and Heating serves Airdrie and Okotoks and can assist with both the camera inspection needed to determine where the problem lies and the repair itself once responsibility has been confirmed.

What This Means for Homeowners Buying an Older Property

Sewer lateral condition is one of the most commonly overlooked items in a home purchase. A standard home inspection does not include a camera inspection of the underground sewer line, which means a buyer can take possession of a property without knowing whether the lateral is cracked, root-infested, or close to failure.

In Calgary, sewer laterals in older communities are particularly vulnerable. Aging clay and Orangeburg pipe infrastructure combined with mature tree canopy and the city’s freeze-thaw cycles makes sewer line defects significantly more common in homes built before the 1980s. A repair bill can reach thousands of dollars depending on the extent of damage and the method required.

If you are purchasing an older home, having a camera inspection of the sewer lateral completed before conditions expire is one of the most cost-effective steps you can take. Whether you need to understand what a repair would involve or what the decision between repair and replacement looks like, Sewer Line Repair Vs Replacement covers the key decision factors in detail.

What to Do If You Discover the Problem Is on Your Side

If a camera inspection or a City crew assessment confirms the issue is within your lateral, the next step is understanding what the repair involves and what it will cost. The scope of work depends on where the damage is located, how extensive it is, and whether trenchless methods are appropriate for your situation. Sewer Line Repair Costs covers what Alberta homeowners can realistically expect to pay for different types of repairs.

R N T Plumbing and Heating performs a full sewer line inspection before recommending any repair method, and provides upfront pricing before any work begins so you understand the full scope and cost before committing.

Book a Sewer Inspection with R N T Plumbing and Heating

If you are experiencing a sewer backup or slow drains and are not sure whether the problem is on your side or the City’s, a camera inspection is the fastest way to get a clear answer. R N T Plumbing and Heating provides professional sewer repair services across Calgary.

Upfront pricing before any work begins, a free plumbing inspection with every service, and a 5-year warranty on all parts and labour.

Call (825) 883-9264 or book online.