Between my house and the street, who owns the Calgary water line?

The City of Calgary draws the line at the service valve, which sits at or near the property line. From that valve to the street, the water main is the City's responsibility. From that valve to your house, including everything inside, the pipe is yours to maintain and repair at your own cost.

The one exception is the water meter: repair costs on private property are the owner's, except for the meter. Everything else on the house side of the service valve, including the supply pipe running under your yard, is your financial responsibility if it needs repair or replacement.

What this means in practice

If you have a leak or a break somewhere between the house and the street, the first call is to the City to confirm exactly where the service valve sits on your property. That conversation also clarifies whether the problem is on their side or yours. If it turns out to be on your side, you will need a certified plumber to do the repair, and a plumbing permit from the City of Calgary will be required for replacing or altering that water service line.

The plumber you hire must be a certified journeyperson plumber or a registered apprentice working under one. That is a requirement under Alberta's Skilled Trades and Apprenticeship Education Act, not just good practice. Before any work starts, ask to see the trade certificate, confirm the contractor holds an Alberta prepaid contracting licence if they are collecting a deposit before the job is finished, and get a WCB-Alberta clearance letter showing their account is in good standing.

On cost: a water service line repair or replacement on private property is not a small job. The price depends on how deep the pipe is buried, how long the run is, what material the existing pipe is made of, and whether the ground between the house and the property line is landscaped, paved or has other utilities nearby. Get at least two written quotes before committing.

The line in any quote most likely to hide extra cost is the excavation and restoration scope: ask specifically whether backfill, compaction, sod or concrete reinstatement are included, or whether those are billed separately after the fact.