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Reuse of Residential Site Services (Water, Sanitary and Storm)

residential infill photo

Customers may apply to reuse a homes existing water, sanitary and storm water service lines in established communities when building a new home or making major renovations. Reusing existing service lines can save property owners money; however, the service lines must meet a number criteria, including pipe size and material type, in order to be approved by The City.

How can site services affect my addition?

The City would like to ensure that present and future owners have access to proper services. The reuse guidelines are intended to allow projects to move forward in a cost efficient and timely manner, while ensuring that the site services are able to adequately service the home and meet current plumbing code and city standards. If you are considering adding plumbing fixtures in your addition, additional requirements may apply.

When should I consider reusing existing services?

It may be possible to reuse some or all of a homes existing water, sanitary and storm water service lines in established communities when doing an addition to an existing home. Reusing existing service lines may save property owners money and time. By submitting the appropriate documents and engaging with an engineering professional accredited in the province in Alberta, (see different section) The City will be able to review your site and confirm that your development will be adequately serviced. This includes reviewing the water service pressure, and ensuring integrity of the piping materials for long term use.

Reusing the existing services might be an option. Engagement with an engineering professional may be required.

Are there risks to reusing my services?

  • Opting to reuse existing water services may negatively impact the pressure and/or volume of water supplied to the homes plumbing fixtures. It is the responsibility of the owner or an owner’s representative to have the water distribution system sized to ensure it satisfies the NPC2015. Please contact the City of Calgary’s Plumbing and Gas Technical Assistance Center for further information.
  • Opting to reuse existing sewer services may result in sewer backups or flooding. The performance of existing sewer services will not be improved if reused without additional rehabilitation.

Who is eligible?

Citizens or contractors can request to re-use site services (water, sanitary or storm) when:

  • Redevelopments where the original basement foundation remains unchanged and the addition proposed will increase the total above square footage by less than 50 per cent.
  • Redevelopments where the above ground addition or basement foundation addition proposed will increase the total above ground square footage by more than 50 per cent. However, in this situation, additional conditions must be met and additional documents are required:

What are the ​conditions that need to be met?

  • The water service is a minimum of 20 mm or larger PE, PEX or copper and has a fully operable service valve capable of providing a complete shut-down of the water supply. Existing water services which are lead or galvanized iron on public or private property are not eligible for reuse as these materials are no longer permitted under the Canadian Plumbing Code.
  • The sanitary service is a minimum of 100 mm PVC or DR17 HDPE.
  • The storm service is a minimum of 75 mm PVC or DR17 HDPE.

What are the required supporting documents?

  • A water service sizing calculation certifying that the existing water service size meets the Canadian Plumbing Code (CPC) Division B fixture count requirements.
  • A private sewer inspection video, accompanied by the engineer’s letter attesting that the existing sanitary and/or storm services are acceptable for reuse.
  • Complete documentation, including engineering design drawings and material specifications for the Cured in Place Pipe (CIPP) installation, where a CIPP sewer line exists, or is proposed for installation as an upgrade.

Who is not eligible?

Should any of the services be determined to require a full length replacement by the Applicant’s Engineering Reports or by the City Review, all services within the same trench should be replaced. This ensures cost effective developments and viability of services.
All work on the City portion of any service must be carried out by a contractor on The City of Calgary indemnified contractor list. Written confirmation of the completed work must be submitted by the contractor directly to The City of Calgary Water Resources – Inspection Services.  More information on installing water and sewer connection can be found here.  

Exceptions may be made for properties where demolition was due to fire or a natural disaster. If you are unsure if you qualify, please contact 311.

What should I know before applying?

Should any of the services be determined to require a full length replacement by the Applicant’s Engineering Reports or by the City Review, all services within the same trench should be replaced. This ensures cost effective developments and viability of services.

All work on the City portion of any service must be carried out by a contractor on The City of Calgary indemnified contractor list. Written confirmation of the completed work must be submitted by the contractor directly to The City of Calgary Water Resources – Inspection Services.  More information on installing water and sewer connection can be found here.  

How do I apply for the re-use of my site services?

All inquiries are now submitted by contacting 311 or submitting an online request. Eligible applicants are required to submit supporting documents for initial review.