Backflow Prevention & Backwater Valve Installation in Toronto

Under Toronto’s Water Supply By-law, backflow prevention requirements apply to specified industrial, commercial, institutional and Part 3 residential properties, as well as construction sites. This makes commercial backflow prevention and industrial backflow prevention particularly important where plumbing systems, equipment or processes can create a risk to the drinking-water supply.

The required assembly depends on the property classification, plumbing configuration and hazard level. Toronto’s program applies to the sectors identified by the City’s Water Supply By-law.

For qualifying Part 3 residential properties, residential backflow preventer installation may also be required. Requirements for other residential buildings depend on the applicable building classification, plumbing configuration and site conditions.

Types of Backflow Prevention Devices

Toronto identifies two principal premise-isolation backflow prevention devices: the Double Check Valve Assembly (DCVA) and the Reduced Pressure Principle Assembly (RP). The required device is selected according to the hazard level and applicable plumbing requirements.

Double Check Valve Assembly (DCVA)

A DCVA uses two check valves to help protect against reverse flow. Toronto requires this type of assembly for facilities classified as moderate hazard. The assembly must remain accessible because it requires regular testing and service.

Reduced Pressure Principle Assembly (RP)

An RP assembly provides a higher level of protection for severe-hazard applications. It uses independently acting check valves separated by a reduced-pressure zone. Backflow prevention valve selection is based on the hazard classification, installation conditions and applicable plumbing requirements.

RP assemblies require adequate drainage and an accessible installation location for testing and maintenance.

Our Backflow Preventer Installation Process in Toronto, Ontario

Professional backflow preventer valve installation begins with reviewing the property’s water-supply layout, potential cross-connections and the type of premise-isolation device required. In Toronto, premise-isolation devices must be installed by a plumber licensed with the City of Toronto.

1. Review the property, water service and hazard classification.
2. Select the appropriate DCVA or RP assembly and installation location.
3. Confirm the applicable Toronto or local GTA permit and compliance requirements.
4. Prepare the water line and coordinate any required shutdown.
5. Install the device with the required valves, fittings, supports and access for future testing.
6. Complete the required initial test after installation.
7. Record the result and complete applicable reporting or documentation.
8. Explain future testing, maintenance and access requirements.

Toronto requires a building permit for new installations and replacements. Commercial backflow preventer installation includes device selection, permit coordination, professional installation and initial testing as one coordinated scope of work.

For condominium and high-rise projects, access, shutdowns and work in common areas may also be coordinated through POM Plumbing’s condo and high-rise plumbing services.

Backflow Preventer Testing and Annual Compliance

Installation is only one part of maintaining a compliant system. Toronto requires qualifying devices to be tested at initial installation, within 72 hours after cleaning, repair, replacement, servicing or overhaul, and at least once every year. Professional backflow preventer testing verifies that the assembly is operating within the required parameters and identifies conditions that may require service.

Testing must be completed by a Cross Connection Control Specialist who meets Toronto’s program criteria and is registered with the Backflow Prevention Program. For businesses and property managers searching for backflow testing Toronto, the service includes the physical test, test tag update and required documentation.

Regular backflow prevention testing may include checking the assembly, recording the result, updating the device test tag and identifying components that no longer operate correctly.