Where they are needed
- Lawn irrigation systems, boilers with chemical treatment, fire sprinklers and many commercial buildings need backflow protection. The Town of Richmond Hill, like many Ontario municipalities, runs a cross-connection control program obliging certain properties to install and test backflow devices; check the current requirements for your property.
- In a typical house, the simplest backflow protection is a vacuum breaker on outdoor taps and an air gap on appliance drains.
Devices
- The two testable devices you will meet most are the double check valve assembly and the reduced pressure zone assembly. An RPZ is used for higher-hazard connections and must be installed above ground with a drain for its relief valve. The right device depends on the hazard level.
- Installation needs space for testing and repair, and the device must be accessible to the tester.
Signs you need this
- You have an in-ground irrigation system
- You received a letter from the town about backflow
- Your business has a boiler or chemical feed
- A device has not been tested this year
- Water from a hose sprayer has an odd taste
Annual testing
- A certified tester has to check these assemblies, normally yearly and again after any install or repair, confirming each check holds tight and the relief valve opens at its set differential.
- Test results are submitted to the municipality. We can test, repair and submit the paperwork. If the device fails, we repair it and retest.
How the job runs
- 1
The hazard level and the required device are confirmed.
- 2
The device is installed with access for testing.
- 3
The device is tested and any failed parts are repaired.
- 4
Results are submitted to the town as required.
Richmond Hill note: most houses here sit on York Region municipal water with fairly hard supply, and many basements have a floor drain tied to the sanitary lateral. Mention both on the phone; it changes what goes on the truck.
Want a second opinion on your own pipes first? Dial (365) 363-1575; the person answering holds the wrench.