At a glance
- Category
- Commercial Plumbing
- Who it is for
- Businesses and buildings
- Phone
- (365) 363-2754
- Read next
- Commercial Plumbing in Ajax
Where backflow preventers are found
- On the main water entry of plazas, offices and multi-unit buildings.
- On fire sprinkler connections.
- Ahead of boilers, carbonated drink machines, irrigation and chemical dispensers.
- In restaurants, salons, clinics and car washes with process water.
What a test involves
- We locate the assembly and record its make, model, size and serial number.
- Water is briefly shut down to the protected side, at a time we set with you.
- A differential pressure gauge goes on the test cocks and each check and relief valve is read against its required value.
- If it passes, it goes back in service and the results are recorded.
- If it fails, we rebuild it with the manufacturer's kit and test it again.
Rules and paperwork
Durham Region operates a cross-connection control program covering businesses, institutions and larger residential buildings. Requirements, testing intervals and reporting steps can change, so check the Region's current program details for your property. Our part is making sure the assembly works and that you have the test details the Region asks for.
| Assembly type | Typical use |
|---|---|
| Reduced pressure (RP) | Higher hazard: chemicals, boilers, medical |
| Double check valve (DCVA) | Lower hazard: many sprinkler and building services |
Local tip Hang a tag with the last test date on the assembly. It helps everyone know when the next one is due.
Questions we hear on the phone
Will the test shut off our water?
Briefly, on the protected side. Most tests take well under an hour, and we book them to suit your hours.
Can a failed assembly be repaired?
Often, yes. Rubber checks, springs and relief valve parts are rebuildable on many assemblies.