WaterWise Backlfow Testing Delta

Delta Backflow Assembly Testing

BCWWA Certified

Serving Ladner, Tsawwassen, North Delta, Surrey, Tilbury, Annacis Island, and Richmond

Services Include


Including underground sprinkler systems









Delta Backflow Testing

In Delta, backflow testing is required annually to ensure safe drinking water. Testable units are installed in underground sprinkler or irrigation systems, fountains, ponds, commercial kitchens, warehouses, offices, industrial complexes, and stratas to name a few.  Backflow assembly devices must be installed, maintained, and certified to prevent contaminants from entering our consumable water supply. 

WaterWise Backflow Testing Delta will test and certify your device by inspecting all components for signs of wear or malfunction and then submit all required documentation to the applicable municipal agency managing the document tracking of your device. 

Trained and Certified by the
BC Water & Waste Association

BCWWA - BC Water Waste Association As BCWWA certified backflow assembly testers, we ensure safe water systems in Delta and the Greater Vancouver areas. We maintain the highest standards of water safety and compliance for residential, commercial, and industrial clients, playing a crucial role in protecting public health and the environment from the hazards of contaminated water.

About Cam Towill

Educated in Civil and Environmental Engineering at the University of British Columbia (UBC), Cam brings over a quarter-century of experience in Mechanical Engineering to his work. His broad expertise covers a range of industries, including pulp and paper, mining, chemicals, bulk material handling, and consulting.

Cam combines his educational background with extensive hands-on experience, underscoring his profound understanding of the critical importance of clean, safe water. He is well-versed in both the technical aspects and the regulatory requirements related to potable water safety. Cam’s unwavering commitment is evident in his work, which spans from ensuring water safety in individual households and businesses to addressing the broader needs of municipal water systems. His primary focus is on protecting the integrity and safety of water, an indispensable resource for all.

Cam Towill - WaterWise Backflow Testing


WCB and Commercially Insured

Our certified backflow testing services will maintain the operational efficiency and safety of your water systems, ensuring they fulfill backflow prevention responsibilities and comply with all municipal and regulatory standards, giving you assured confidence and peace of mind.

Frequently Asked Questions

Backflow is the unintended reverse flow of water from an upstream piping system into a downstream water system. This reverse flow can be caused by one of 2 conditions: back pressure and back siphonage. The concern is when an upstream piping system is contaminated and a backflow condition happens, allowing the contaminated water to flow into the downstream piping system contaminating that water and rendering it unsuitable for drinking.

Back siphonage happens when the pressure in the upstream system is higher than the downstream system. An example is when a break occurs in a watermain in the street. Water flows out of the pipe at a high volume, resulting in a drop in the pressure in the pipe a that point. Water in pipes upstream of the break will then flow backwards towards the break.

Back pressure happens when the pressure in the upstream side of the piping system becomes higher than the downstream or supply side of the piping system. This causes water to flow backwards from the high-pressure side to the low-pressure side.

Potable water is considered safe for ingestion by health authorities, either when drunk directly in liquid form or consumed indirectly through food preparation. It is often supplied through taps in which case it is also called tap water.

Non-potable water is not suitable for drinking but may still be used for other purposes.

A cross connection in our water system is a connection that might let hazardous substances compromise the quality of the potable (public) water. To prevent such occurrences, these connections need backflow devices.

Garden hoses submerged in pesticide mixtures, piped connections that supply potable water to industrial processes like cooling towers, and submerged outlets of irrigation systems are common examples of cross-connections. Another frequent type of cross-connection is the connections to firefighting equipment. Most cross connections happen within residential, commercial, institutional, or industrial plumbing systems, beyond the city service connection.

Backflow assemblies are devices that stop a backward flow of contaminated fluid or substance into the clean water system when a backflow condition happens. Depending on the hazard upstream of the portable water system will dictate the type of backflow assembly required. There are 3 type of hazard classifications in Canada:

Minor Hazard: involves a substance that constitutes only a nuisance and that only results in a reduction in only aesthetics qualities of water. These substances cannot create a danger to health.

Moderate Hazard: any minor hazard connection that has a low probability of becoming a severe hazard. These substances can create a danger to health.

Severe Hazard: involves water that has additives or substances that, under any concentration, can create a danger to health.

Testable backflow assemblies are installed in moderate and severe hazard locations due to the potential hazard of the water upstream of the device. Non-testable backflow assemblies are installed in minor hazard locations.

Yes, if your backflow device is installed in an area classified as having a moderate or severe hazard risk to potable water. These devices must be tested and recertified at least annually.

Testing is typically required at least annually by the local regulatory authorities and per manufacturer recommendations. Sometimes testing may need to be done more often than once a year. Backflow assemblies are a mechanical device and do wear out over time, hence why the need to do regular testing to prevent a backflow condition. Regular maintenance will ensure its proper functioning and the safety of potable water.

No! A certified individual, who has undergone rigorous training and passed the required exams on backflow theory and practical testing procedures, must test backflow assemblies. The BC Water & Waste Association in BC administers the certification tests for those seeking to qualify in backflow assembly testing.

Yes! If a backflow assembly fails to meet the minimum standard of operation, this could potentially allow a contaminant to backflow from a hazardous source into the potable water system. The backflow assembly must be repaired or replaced by a qualified individual who meets the current local plumbing code and cross connection regulations.

Testing is done on site with a Backflow Preventor Test Kit, which measures the differential pressure across the check valves within the backflow assembly. These check valves are designed to prevent water flow fromgoing in the wrong direction.

The Test Kits need to be able to read the pressure in 0.2psi increments. They are very sensitive instruments. These Test Kits must be recalibrated on an annual basis to ensure they are recording correctly.

Depending on which backflow assembly is being tested, one, two or three hoses are attached to the assembly during the test to check the pressure differential across the check valves to simulate different potential flow situations the assembly might encounter.

Help keep the City of Delta drinking water clean and healthy by preventing cross connections on the property. Backflow prevention devices help protect public safety by preventing potable water contamination in such critical areas as municipal water systems, food processing plants, medical and dental water supplies, and many industrial applications.

You must have your backflow preventer tested annually or immediately after a backflow preventer has been:

Relocated, replaced, or repaired. Internally cleaned, with changes or alterations in the piping, including repairs, modifications, or replacements in the piping supplying the backflow preventer.

Backflow Prevention Assembly Test Report

Existing Backflow Preventers: The City of Delta is no longer accepting paper copies of the test results. Delta has contracted BSI Online to manage the online test report submissions. The certified testers must register and submit the test reports online to BSI. Please see the steps in the BSI Brochure for further details.

New or Unregistered Backflow Preventers: A paper copy of the Backflow Prevention Assembly Test Report for new or unregistered backflow preventers shall be submitted by email. Plumbing permits are required for all new or unregistered backflow preventers.

Replacing Backflow Preventers: For any existing backflow preventers that are replaced, the new backflow preventer shall be tested immediately and a test report with the updated information shall be submitted to BSI Online.

Removing Backflow Preventers: For any existing backflow preventers that are removed, BSI Online must be contacted and notified of the reason for the removal along with proof of proper removal and capping of the service connection.

Get In Touch

Please call 604-916-3715 or fill out the form.

WaterWise Backflow Assembly Testing in Delta, BC. Serving Ladner, Tsawwassen, North Delta, Surrey, Tilbury, Annacis Island, and Richmond.

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