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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.


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 monitoring in Calgary's water service lines

Lead is not found in our source water, from the Bow or Elbow Rivers. Prior to 1950, lead was commonly used for water service piping. Copper and plastic pipes have since replaced lead.

The City is proactively working with customers (about 551 in use) identified with lead service connections. We mail notices to residents with lead service connections each year and offer a number of services to ensure high quality drinking water:

  • Water quality testing
  • Education and tips about maintaining water quality
  • A rebate for a NSF-53 certified, kitchen-tap mounted or built-in water filtration device

Lead service connections are replaced if monitoring indicates replacement is necessary, as nearby water mains are replaced and when sites are redeveloped.

For more information about our lead service connection program please call 311. If you have concerns about your water quality, contact 311 and the City will work with you to investigate.

For more information on NSF certified filters, please visit the Public Health and Safefy Organization site​.