Cross Connection Control Program

Cross Connection Control - FAQs

• What is a Cross Connection?

  Any actual or potential physical connection in which the potable water system is directly or indirectly connected to a piping system containing non‑potable water, allowing non‑potable water to enter the potable water system as a result of backflow.

• What is Backflow?

  The reverse direction from normal direction of flow of water or used water, as a result of backsiphonage or backpressure.

• What is Backsiphonage?

  Backsiphonage is a type of backflow caused by negative or reduced pressure in the supply piping.

• What is Backpressure?

  Backpressure is backflow caused by downstream piping operating at a higher pressure than upstream piping.

• Does water contamination due to backflow actually occur?

  Although there have not been any reported backflow incidents in Nanaimo, it is a well-documented and proven risk to the water supply system. There have been many incidents across the country and around the world.

  In the town of Redcliff, Alberta, fertilizer from a greenhouse was backsiphoned into the water main and delivered to another customer who unknowing drank the contaminated water via his home faucet. The customer became violently ill within hours. This backflow incident occurred as a result of the Towns water main being shut off for repairs and the greenhouses lack of backflow protection.

• Who owns the backflow prevention devices?

  The owner of the business or facility is responsible for the installation, maintenance and renewal of any required backflow prevention devices.

• Where are backflow prevention devices located?

  Backflow prevention devices may be installed either at the point where the water service enters the property from the road or within a mechanical room. There are several acceptable options for device placement. Property owners should work with a qualified plumbing contractor, in consultation with the City of Nanaimo, to determine a suitable installation location.

• Why are backflow preventers tested annually?

  Annual testing of backflow prevention devices ensures the equipment is functioning correctly and continues to protect the potable water system. Regular testing provides the City and water system users with confidence that appropriate safeguards are in place to reduce the risk of contamination

• Removing a backflow preventer

  Removing a Backflow Preventer (Not Replacing)

  If a backflow preventer is being removed and not replaced, one of the following must be completed:

  • Online Form:
    Complete and submit the Backflow Preventer Removal Report online.

  • PDF Submission:

    • Print and complete the City of Nanaimo Backflow Preventer Removal Report
    • Email the completed form to: cccp@nanaimo.ca

• I have received a notice stating that I must have my backflow preventer tested. What do I do?

  Coordinate with a certified backflow tester to have the device tested, and ensure the tester submits the test report to the City of Nanaimo Cross Connection Control Program at CCCP@nanaimo.ca.