We test, install, and repair backflow prevention devices across the Toronto and GTA region including Peel Region, Halton Region, Markham and beyond.

backflow prevention device installed at commercial facility in torontoYou can depend on us for all of your Toronto backflow preventer needs, we are fully licensed and certified service providers. Should you require we can provide annual inspection and testing services.

Often times a backflow prevention devices are simply referred to as a backflow preventer valve. It is common to mix up a backflow preventer and backwater valve. If you are looking to prevent municipal sewer backing up, you are likely interested in a backwater valve.

Double Check Valve Assembly (DCVA) Backflow Prevention Device

Double Check Valve Assembly (DCVA) Backflow Prevention Device

Backflow Device Annual Testing

It is important to make sure that your backflow prevention device is working as intended, as such we provide full backflow preventer testing services in Toronto and across the GTA including Mississauga, Etobicoke, and beyond.

Toronto’s Backflow Prevention Device Program

The Safe Drinking Water Act and Ontario Ministry of the Environment and Climate Change regulations mandate that water purveyors protect the municipal water supply. The Water Supply Bylaw includes within a specific program describing the protection of drinking water via backflow prevention device. Under many circumstances it is the law that your residential (buildings of 5 or more units), commercial, industrial, or institutional property possess a well-maintained backflow prevention device.

Did You Receive a Backflow Preventer Testing Letter?

The City of Toronto is contacting various businesses to ensure their backflow prevention devices are working properly. It’s important that these devices work in order to keep municipal water clean.

If you received a letter from the city, we can help. We’ll inspect your backflow prevention device, and, if needed, install the correct device for your property and usage.


Cross Connection Survey services are also available.

Backflow Device Installation

Reduced Principle (RP) Backflow Prevention Device

Reduced Principle (RP) Backflow Prevention Device

Which Backflow Device do You Need?

Depending on the specific use of your building, the backflow prevention device valve you are legally required to install varies. We will help you to install the correct backflow valve for your specific facility’s needs according to local bylaws and standard practices.

For example, in the City of Toronto, for facilities that fall under the ‘moderate hazard’ classification a Double Check Valve Assembly (DCVA) device will be required. If your facility falls under the ‘server hazard’ classification a Reduce Pressure Principle (RP) backflow preventer will be required.

Backflow Device Building Permits 

In most cases, a building permit is required to install a backflow prevention device. We will assist you in obtaining this permit, complete all the paperwork and arrange a backflow prevention device inspection. We have years of experience working with the city of Toronto, Mississauga, Etobicoke, Oakvile, Markham, Richmond Hill, Scarborough, North York, King City, Maple, Woodbridge, and more. Contact us to learn more about backflow device permits and avoid costly mistakes when installing a backflow device.

Double Check Valve Assembly (DCVA) Backflow Preventer

Double Check Valve Assembly (DCVA) Backflow Preventer

Common Uses of Backflow Valves

Some of the most common uses of backflow valves include sprinkler systems and/or irrigation plumbing. A sprinkler backflow preventer will stop water used in the sprinkler system from contaminating the potable water, and likewise an irrigation backflow preventer will eliminate any water from an irrigation system backing up into the water mains and causing contamination.

For more information on our backwater preventer installation & testing services please contact us directly.If your backflow prevention device is leaking, call Absolute Drain and Plumbing to repair or replace your Backflow device. We are licensed to diagnose and solve types of backflow device problems.

★★★★★ Experience 5-Star Customer Service from Absolute Draining & Plumbing

  • ★★★★★ Andrew inspected my drain. He was professional, pleasant and punctual.

    Paul M Toronto, ON
  • ★★★★★ Professional, quick and best priced draining and plumbing company I called.

    Terence S Toronto, ON
  • ★★★★★ Andrew was terrific.

    Mel K Downtown Toronto, ON

Have a question? Give us a call, we’re here to help

Is a backflow preventer same as a check valve?

backflow preventer protects your potable water. A check valve controls flow but it is not absolute. A check valve is not an appropriate substitute for a backflow preventer.

What is the difference between a backwater valve and a backflow preventer?

Backwater valves are designed to protect your house from sewer water backups. A backflow preventer is installed in the waterline to prevent the reverse flow and mixture of contaminated water with a clean water supply.

When should I install a backflow prevention device?

You need a backflow preventer if you have a culinary water connection that may be used to supply a sprinkler system, a washing machine, or other equipment with potentially dangerous chemicals, like bleach or descaling solutions.

Is annual backflow device testing necessary?

Backflow device annual inspection is mandatory for commercial properties in many municipalities across Ontario. You may be fined if you do not perform a Backflow preventer inspection and your Backflow device fails.

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