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Rows of yellow supply pipes running in parallel along a wall
Parallel supply lines running through a service space.

Cross-connection control

Backflow Testing and Repair in Toronto

A backflow device keeps water that has entered your building from slipping back into the public main. That protection lasts only as long as someone tests and services the assembly.

  • Testing by a certified backflow tester
  • Check valve and relief valve rebuilds
  • Replacement of failed or wrong devices
  • Test reports for your records

Licensed & insured · details on request

  • 24/7Response line: a plumber answers, day or night
  • 27Areas covered, from the old city to the suburbs
  • 35Services for homes, condos and businesses

Backflow in plain words

Normally, water flows from the city main into your building. When street pressure falls, say from a broken main or fire crews drawing hard on a hydrant, the flow can reverse. Without protection, water from a boiler, an irrigation line, a carbonated drink machine or a chemical feed could enter the public supply.

  • Double check valve assemblies for moderate hazards
  • Reduced pressure zone assemblies for higher hazards
  • Vacuum breakers on hose bibbs and irrigation

Who usually needs a device

  • Restaurants with drink dispensers and dish machines
  • Buildings with boilers or fire sprinkler systems
  • Medical and dental offices
  • Car washes, laundromats and light industrial units
  • Properties with lawn irrigation systems
Toronto requires certain properties to install and test backflow preventers and submit results to the City. The City revises these requirements now and then, so check what applies to your address today.

What happens during a test

  1. The tester confirms the device type, size and location
  2. The supply is closed for a few minutes at the assembly
  3. Test gauges are attached and each check valve is checked for tightness
  4. Relief valve opening points are measured on RPZ assemblies
  5. Results are recorded and the device is put back in service

When a device fails

When a device fails, the usual culprits are grit lodged on a seat, a tired rubber disc or a weakened spring. Many devices can be rebuilt on site with a repair kit. Older or wrongly-sized units sometimes need replacement, and we explain why before quoting the work.

How the job runs

  1. Ring the line

    Say what is dripping, backing up or banging. Water still flowing? We guide your hand to the valve first.

  2. Find the cause

    The plumber traces the fault, with a scope or gauge where one earns its keep.

  3. Pick the fix

    Options come in everyday language, and nothing starts until you choose.

  4. Repair & prove it

    We finish, run the water to prove it, wipe up and leave a short written record.

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