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Cross connections for homeowners


The City of Calgary is committed to providing safe, reliable drinking water. To protect our drinking water from contamination, we oversee annual testing and compliance of cross connection devices.

I have received a cross connection letter from the City of Calgary

If you have received a cross connection letter, please visit Cross Connection Testing. This page includes all the steps you need to take, including how to contact a certified tester.

Cross connection responsibilities for homeowners

Homeowners must ensure no cross-connections exist on their property that could contaminate their water supply. Cross connection locations include the following:

Outdoor cross connections:

  • Outside hosebibbs (i.e., garden hose attached to an outside tap or hose bib with the end of the hose connected to a pesticide sprayer; or left submerged in an ornamental pool, above-ground lawn watering);
  • In-ground lawn watering (irrigation) systems

Indoor cross connections

  • Toilets
  • Laundry sink connected with hose(s)
  • Handheld shower heads left immersed in water

Other cross connections

  • Boiler for in-slab or comfort heating
  • Fire protection system
  • Hot tub or spa
  • In-home water treatment (softener) system
  • High-pressure washer

Learn more about preventing water contamination in and around your home. You can also find more ways to protect drinking water in theCross Connection Residential Brochure.

Cross connection control device testing

If a homeowner has a cross-connection control device installed in their home, it must be tested annually per Cross Connection Testing.

If you are a new owner of a property with a cross connection control device installed, or if you have recently changed your contact information, please call 311 to update your information.

Learn more about cross connection control testing in our frequently asked questions.​