Backflow Prevention Testing in Markham

Signs you need backflow prevention testing

Backflow happens when pressure drops in the municipal main, during a watermain break or heavy firefighting, and water inside a building gets siphoned back toward the street. If that building has boilers, irrigation, chemical lines or commercial equipment, the water heading backwards could be contaminated. Testable devices stop that, and they need periodic checks to prove they still work.

• A notice from the municipality asking for a device test report.
• A new lawn irrigation system, boiler or commercial kitchen.
• A device that is dripping from its relief valve.
• A property purchase where no test history is on file.

Our routine on the day

Testing is done with a calibrated gauge connected to the device's test cocks. We briefly shut the water off, check every check valve and relief valve against its required pressure difference, and record the results. If the device passes, you get a written test report to submit. If it fails, we explain which part is at fault, usually a worn check or a fouled relief valve, and rebuild or replace it before retesting.

For new installations, the device type depends on the hazard. Lawn sprinklers commonly use a pressure vacuum breaker or double check valve, while higher-hazard connections call for a reduced pressure principle assembly. We install it at the right height and orientation, with room to test later.

Markham houses and what shapes this job

Most single-family houses in Markham do not have a testable backflow device unless they have irrigation or a hydronic heating system. Large properties in Angus Glen often do, thanks to in-ground sprinklers. Small commercial units along Highway 7 and Woodbine have them on their service lines, and those owners typically receive regular test reminders.

Keeping records

Keep a copy of each annual report with the device's make, model and serial number. If you sell the property or change management companies, that history saves time and avoids a missed test deadline. We note the next due date on every report so it is easy to plan.

Ring us without delay if

If a relief valve is discharging continuously, the device has detected a problem or is fouled. Call for a test and repair. Questions about the main valve on a home service are covered on the main shut-off page, and outdoor sprinkler hose bibs are on outdoor faucet repair.

Commercial tenants should check their lease, too. Sometimes the landlord arranges testing, and sometimes the job falls to the business. A quick question to your property manager avoids a missed deadline and a reminder letter from the city.

What we check before we pack up

1. Read static pressure at a hose bib
2. Pressure-test new pipe before closing walls

Quick answers