A water service line freezes when frost reaches deeper than the pipe, often under a cleared driveway, in a long cold spell with little snow, or where the line was laid shallow. Every tap goes dry at once. Responsibility is usually split at the property line or curb stop: the municipality handles its side, the owner pays for the private side and often the meter. Confirm with your utility.
- All taps dry at once, with no outage reported, points to a frozen service line or meter rather than a branch inside the house.
- Frost goes deeper where snow is cleared, because snow insulates the ground; driveways and paths over a service are classic freeze spots.
- Calgary says owners pay repair costs on the private side, including frozen water meters; Winnipeg may charge thawing fees depending on where the freeze is.
- Underground lines need a utility or plumber with specialized thawing equipment; homeowners should not try to thaw them with heat.
- Some cities send letters asking at-risk properties to run a tap all winter; follow the letter until the utility says to stop.
01 /What is a water service line, and why would it freeze?
The water service is the buried pipe that carries water from the municipal main under the street to your house, where it rises through the basement floor or foundation wall to the main shut-off and the meter. It is normally buried below the depth that frost reaches in an ordinary winter, so the soil around it stays above freezing. It freezes when frost goes deeper than usual or the pipe is shallower than it should be.
- Cleared snow. Snow is an insulator. Where a driveway, walkway or parking pad over the service is kept clear, frost penetrates deeper than under the snow-covered lawn beside it.
- Cold with little snow. A deep cold spell before much snow has fallen, or a winter with thin snow cover, drives frost down everywhere.
- Shallow or disturbed services. Older services, lines near the river valley or services crossing a ditch, culvert or landscaping cut can sit closer to the surface. Calgary notes customers closest to the river and in older communities tend to be at greater risk of buried service pipes freezing.
- Where it enters the house. The section passing through the foundation and a cold basement corner, and the meter itself, can freeze from the inside if that area is not heated.
02 /How do I know the service line or meter is frozen?
The telltale is that everything stops at once. Winnipeg's guidance is that very little or no water from all faucets points to an underground freeze, while some faucets flowing and others not points to internal plumbing. Calgary and Winnipeg both list visible frost on internal pipes or the main shut-off as a sign, and EPCOR in Edmonton says to look for frost on exposed pipes in the basement.
- Rule out an outage
Check your utility's outage page or call 311. A main break looks the same from inside the house.
- Look at the entry point
Check the pipe where it comes through the floor or wall, the main shut-off and the meter for frost or ice.
- Feel the room
If the meter sits in a cold room, closet or crawlspace, the freeze may be right there rather than underground.
- Call the utility
Report a suspected frozen service. Many cities want to be called first, because the freeze may be on their side of the line.
If only some taps are dead, the problem is inside the house; the frozen pipe signs guide and the thawing guide apply instead.
03 /Who is responsible for a frozen service line?
Responsibility is usually split at a boundary, often the property line or the curb stop valve, and the details are set by each municipality's bylaws and fee schedules. Your city's side is generally its responsibility; the private side from that boundary into the house, and often the meter, is the owner's. Always confirm with your own utility, because rules, fees and whether the city will thaw the private side differ.
| Utility | What its published guidance says |
|---|---|
| City of Calgary | Report through 311. The City attempts to thaw its portion and your private portion after you complete an authorization form. The owner pays all repair costs on private property, including missing, damaged or frozen water meters. |
| City of Winnipeg | Request thawing through 311; fees may apply depending on where the freeze is. Crews thaw between the property and the shut-off valve, usually at or near the property line. If the pipe is frozen on the owner's portion, the owner pays; if on the City's portion, there is no charge. |
| City of Toronto | Call 311 and someone from the City will investigate. Privately owned pipes, from the property line into the home, need a licensed plumber. |
| EPCOR (Edmonton) | Its frozen-pipe page focuses on prevention and gentle thawing, and says to contact a plumbing or heating company if you are unsure or the pipe will not thaw. Ask EPCOR directly about a frozen service. |
| Halifax Water | Keep a safe heat source where the service lateral enters the home, and close the inside shut-off to limit flooding from split plumbing. Its 24/7 emergency line takes reports of lost service. |
Two practical points follow. First, do not dig, cut or apply heat to the service yourself: you may be working on city property, and underground thawing uses specialized equipment. Second, read any authorization form carefully. Winnipeg's form, for example, has the owner accept all costs if the freeze turns out to be on the private portion.
04 /How are frozen service lines thawed?
By the utility or a plumber with thawing equipment, not with heat from inside the house. Methods vary: some push a small hose up the service line from the house and circulate warm water to melt the ice from the inside; others use electrical thawing, which is only suitable for certain metal pipes and carries its own risks. Which one is used depends on the pipe material, its length and local practice.
What homeowners should not do is try to warm a buried line from the basement with a torch or heater, or pour boiling water into anything. Winnipeg's thawing page specifically warns against boiling water, open flames, hair dryers and portable heaters for this job. The frozen section is underground, out of reach, and the fire and flood risks are real.
05 /How can I keep the service line and meter from freezing?
- Keep the entry area warm. Toronto asks residents to keep areas warm especially near the water meter, even when away. Montréal asks for at least 10 °C around the water entry, and Halifax Water for a safe heat source where the service enters.
- Seal the entry. Air leaks around the pipe where it comes through the foundation, or through a nearby rim joist, can freeze the riser and meter. Seal them.
- Leave snow over the line. Where you can, avoid clearing snow from the lawn over the service, and do not pile cleared snow elsewhere at the expense of that strip.
- Run water if asked. Calgary's Frozen Pipes Prevention Program sends letters from December 1 to March 31 to properties identified as at risk, asking them to run one inside tap about the width of a pencil 24 hours a day until a follow-up letter arrives, with a flat billing rate for metered homes during the program.
- Protect a meter in a cold space. If the meter sits in an unheated room or pit, ask your utility what protection it allows; do not modify utility equipment yourself.
If your service has frozen before, ask the utility whether your address is on a watch list and what they recommend. The dripping tap guide explains why a pencil-thin stream works where a drip does not, and the Across Canada page summarises how cold snaps play out by region.
06 /Can drains and sewer lines freeze too?
They can, less often. The building sewer, or lateral, leaving the house carries warm water and is usually empty between uses, so it rarely freezes solid. The exceptions are shallow sections under cleared driveways, laterals with a sag that holds water, lines to outbuildings, and drains carrying a slow trickle, such as a condensate line, a water softener discharge or a dripping fixture, that freezes as it goes. A frozen drain shows up as water backing up in the lowest fixture or floor drain.
That side of the house belongs to the HAUSE sewer network. SewerJetting.ca covers how frozen drain and sewer lines are opened, and DrainAugering.ca covers cable clearing. On this site, the only drain advice is to keep a trickle running into a drain that itself stays warm, and to report backups promptly.
FAQQuestions people ask
Who pays to thaw a frozen water service line?
It depends on where the freeze is and your municipality's rules. Typically the city covers its side and the owner pays for the private side, sometimes including the meter. Winnipeg, for example, may charge fees when the freeze is on the owner's portion.
Can I thaw a frozen water main line myself?
Not the buried part. Underground service lines are thawed by the utility or a plumber with specialized equipment. You can keep the entry area and meter warm and report the problem, but do not apply heat to a buried line.
Why did my water line freeze under the driveway?
Cleared snow lets frost go deeper. Snow on a lawn insulates the ground, while a bare driveway loses heat fast, so the frost line under it can reach a service that is safe under the lawn.
Is a frozen water meter the homeowner's responsibility?
Often, yes. Calgary states that owners pay repair costs on private property, including frozen water meters. Keep the meter area heated and check with your utility for its rules.
Why does the city want me to leave a tap running all winter?
Some properties have services known to be at risk of freezing. A continuous thin stream keeps water moving through the buried line so it does not freeze. Follow the utility's letter on flow and timing.
How long does it take to thaw a frozen service line?
It varies with the method, the length of the frozen section and how busy crews are in a cold snap. Calgary, for example, warns that response times may be delayed by high volumes and notes you can hire a plumber at your own expense for faster service.