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Water service lines in Calgary

A water pipe, also known as a water service line, is the way drinking water is delivered to each home in Calgary. The water pipe can be thought of as two sections:

From the water main to the property line
This part of the pipe is owned and maintained by The City of Calgary.

From the property line to your house
This part of the pipe is owned and maintained by the homeowner.

Print guide for water service line leaks

See ourHomeowner Water Guide for water service leaks on private property.

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What are the responsibilities of The City and homeowner?

All water pipes and devices outside the property line are the responsibility of The City of Calgary. That includes things like water mains, water main valves and service valves. We are responsible for all repairs to these lines.

The homeowner is responsible for the water pipe that leads from their house to the service valve (which is usually located at or near the property line). The homeowner is responsible for the main shut-off valve that is normally located inside their house.


Property Lines

In most cases, the property line ends a few metres from the edge of the curb or sidewalk. The legal survey completed when the building was purchased shows where the property line is located.

The diagram below shows that the water service valve is placed very close to the property line, but is not always on The City's side, however The City owns it.

The property owner is responsible for all repair costs to the service on private property (with the exception of the water meter).

Service Line Diagram  


Service line leak example
An example of a leaking service line

What causes a service leak?

Water service leaks can result from corrosion due to pipe age and material type, soil type, ground movement and/or the expansion/ contraction of the pipe resulting from temperature variations.

A drop in water pressure may indicate a leak in the water service outside the building (between the city water main and the water meter).


What if I suspect there is a leak on my property?

If you suspect there is a leak on your property, visit Water Service Line Leaks to see how to detect a leak, and what steps to take to fix it.

You can also download ourHomeowner Water Guide on Water Service Lines.


Lead and service lines

Lead is not naturally found in the Bow and Elbow Rivers, Calgary’s source water. The water produced by The City of Calgary Water Treatment Plants meets or is better than quality guidelines set by Health Canada. The City consistently monitors for lead at its Water Treatment Plants and multiple locations throughout the distribution network.

Lead in drinking water can come from lead service lines running between the water main in the street and the home, and from plumbing inside the home that may partially contain lead such as solder, pipes, pipe fittings or fixtures.

Learn more about the history of lead service lines in Calgary, how the City works with homes that have been identified as having public lead service lines and steps homeowners can take to mitigate lead in drinking water.

Visit Lead and Water Services Lines​.