Frequently Asked Questions
About Backflow Prevention
Backflow prevention can be complex. At Sea to Sky Backflow Assembly Testing, I strive to provide clarity and expertise to ensure your water systems remain safe, compliant and my nearby communities are well educated on Backflow Prevention. Please contact me if you have any additional questions.
01
What is a Cross Connection?
According to the Canadian Standards Association, a cross connection is defined as any actual or potential connection between a potable water system and any source of pollution or contamination.
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Cross connections are present in every water system and, depending on the size of the system, hundreds or thousands of potential cross connections can exist.
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Wherever physical cross connections exist between a potable and non-potable water, there is the potential for backflow to occur.
02
What is backflow, and why is it a concern?
Backflow occurs when contaminated water reverses its flow into the clean water supply.
This can happen due to a drop in water pressure, posing a health risk. The two types of backflow are known as 'backpressure' and 'backsiphonage'.
03
What is the difference between backpressure and backsiphonage?
Backpressure occurs when the downstream water pressure is greater than the water supply pressure. This can occur in any pressurized system such as chemical feed pumps, boilers, elevated tanks, or recirculating systems.
For example, water in a boiler operating under a pressure of 15–20 psi would backflow into the potable water if its supply pressure fell below this level. Sometimes this pressure drop can be created just by flushing a toilet!
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Backsiphonage is caused by negative pressure from a vacuum (or partial vacuum) in the supply piping, just as drinking through a straw draws liquid from a glass.
Backsiphonage can be created when there is stoppage in the water supply due to repairs or breaks in the Municipality’s water main; an increased demand at one location, such as firefighting; or even undersized piping.
Backsiphonage reverses normal flow in the system, and can pull contaminants into the drinking water.
04
What are common sources of cross connections?
Common sources include:
• Irrigation systems
• Fire sprinkler systems
• Pools and hot tubs
• Plumbing connections to chemical or fertilizer tanks
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Identifying and addressing these connections is vital for preventing contamination.
05
How often should backflow prevention devices be tested?
Annual testing is typically required to ensure devices are functioning properly and to maintain compliance with local water regulations.
06
Can I perform backflow prevention testing myself?
No, for compliance with your municipality testing must be conducted by a BCWWA certified professional who is licensed to submit the results to your local municipality via the MTS fast system.
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Sea to Sky Backflow Assembly Testing exclusively conducts tests, holding an active BCWWA Backflow Assembly Tester Certificate and possessing the expertise and certifications to meet all your backflow prevention testing needs.
07
What are the consequences of
non-compliance?
Non-compliance with backflow prevention regulations can result in fines, legal issues, and potential health hazards. Regular testing and adherence to local ordinances are essential for avoiding these consequences. Please review your municipality’s Cross Connection Control Bylaw (RMOW, Pemberton, Squamish) for specifics.