Backflow Prevention Testing in Toronto & the GTA
Toronto & the GTA • Call 647-784-8448
Toronto's cross-connection control program requires backflow preventers to be tested annually by a certified tester. Failure to test on time leads to compliance notices and fines. Tornado Plumbing & Drains tests, certifies, and submits reports for RPZ, DCVA, and PVB backflow preventers across Toronto and the GTA — restaurants, multi-tenant buildings, irrigation systems, and commercial properties.
Last updated April 24, 2026
When this service makes sense
Part of Commercial Plumbing in Toronto & the GTA
Book this service when
Book this when Toronto Water has sent a cross-connection notice with a deadline, an annual RPZ test is due, a new device needs its first certification, or an irrigation PVB needs spring start-up testing.
Common signs
- You received a cross-connection control notice or testing reminder from Toronto Water and the deadline is approaching
- Your restaurant, cafe, or commercial kitchen needs its annual RPZ test renewed to keep its permits and health approvals clean
- A new backflow preventer was just installed and the initial certification test has to be filed before the device counts as compliant
- Your irrigation system PVB or lawn-sprinkler device needs spring start-up testing after winter shutdown
If you're not sure, compare these too
- Backflow Preventer Installation - when the device failed its test and cannot be rebuilt, or none exists
On this page
Quick guide and key details
What changes price and scope
- Number of devices tested on one visit.
- Repairs to a failed device, quoted separately.
How a professional visit usually unfolds
1. Confirm device
Locate the device, record serial and last test date. Required for the report.
2. Test
Perform the certified test procedure with calibrated gauges. Confirms device is functioning.
3. Repair if failed
Diagnose, replace components, retest. Returns the device to compliance.
4. Certified report
Complete the test report. Required for city submission.
5. Submit to City
Submit the report under the property's program. Closes out compliance.
Recent Backflow Prevention Testing work
These real project photos show the kind of work this service involves, so you can see examples before you book.
Commercial plumbing crew working inside an industrial facility
Commercial crew on site inside an industrial facility, showing the kind of access, equipment, and coordination commercial plumbing work can involve.
Backflow testing pricing (Toronto 2026)
| Service | Starting from | Typical range |
|---|---|---|
| Single device test | $180 | $180 to $320 |
| Multi-device same visit (each) | $140 | $140 to $250 |
| Failed device repair | $280 | $280 to $900 |
| Device replacement | $650 | $650 to $2,800 |
Ranges are for planning and triage. Final pricing depends on access, urgency, materials, and whether the visit stays isolated once the area is opened.
Cities Where This Service Is a Strong Fit
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Licensed, insured, reviewed Toronto plumbers
- Serving Toronto & the GTA since 2015 — over 1,200 completed jobs.
- Master plumber T95-4969603 · Plumbing contractor T94-4992639 · Drain contractor T87-4722944 · Building renovator T85-4728632 · Plumbing license FI6216638.
- 4.9-star Google rating from 320+ reviews. 400+ HomeStars reviews (Best of 2019–2025). BBB-accredited.
- Same-day and after-hours dispatch across Toronto, Etobicoke, North York, Scarborough, York, Mississauga, and Burlington.
25-year workmanship warranty
Every job Tornado Plumbing & Drains completes in Toronto and the GTA — repair, install, replacement, drain work, sewer work, fixture work — is backed by a 25-year workmanship warranty. The written terms are provided with every quote. If our work fails within 25 years of the install date, we come back and make it right.
What a backflow field test actually measures
A backflow assembly can pass water normally and still fail certification, because the test checks pressure differentials a homeowner never sees. Our certified tester closes the shutoffs, connects a calibrated differential gauge to the test cocks, and confirms each check valve holds tight against reverse flow and that an RPZ relief valve opens at the correct pressure spread before the seals leak. Those readings — not whether water comes out the tap — are what the certificate certifies, which is why a device that looks fine can still flunk the annual.
When you need backflow testing done
- You received a cross-connection control notice or testing reminder from Toronto Water and the deadline is approaching
- Your restaurant, cafe, or commercial kitchen needs its annual RPZ test renewed to keep its permits and health approvals clean
- A new backflow preventer was just installed and the initial certification test has to be filed before the device counts as compliant
- Your irrigation system PVB or lawn-sprinkler device needs spring start-up testing after winter shutdown
- The RPZ relief valve is dripping or discharging water onto the floor, which usually points to a failed check valve that needs testing and repair
- A multi-tenant building or condo has multiple devices on different risers that all need testing and reporting under one property file
- You are buying or leasing a commercial property and need proof the existing backflow assemblies pass before closing
What's included
- On-site test of each RPZ, DCVA, or PVB assembly with a calibrated differential pressure gauge, verifying both check valves and (on RPZ units) the relief valve opening point
- Confirmation of the device tag, serial number, size, and location so the city record matches the assembly on the wall
- Completion and signing of the official cross-connection control test report by our certified backflow tester, submitted to the City's program on your behalf
- Minor field adjustments and resetting of the device, plus a clear pass or fail result explained on the spot
- A written repair quote with the failed part identified — check valve, relief valve, or rubber seat — so re-testing can be scheduled quickly
- Wipe-down of the test cocks and work area, and a copy of the filed report emailed to you for your records
- Our written 25-year workmanship warranty on any backflow repair or replacement work we perform
Backflow device types we test
| Device | Where it is used | Test frequency |
|---|---|---|
| RPZ (Reduced Pressure Zone) | High-hazard cross-connections | Annually |
| DCVA (Double Check Valve Assembly) | Low-hazard cross-connections | Annually |
| PVB (Pressure Vacuum Breaker) | Irrigation and outdoor systems | Annually |
| AVB (Atmospheric Vacuum Breaker) | Hose bibs and fixture vacuum breakers | Visual inspection |
Backflow testing cost
Testing is straightforward and priced per device. Properties with multiple devices on a single visit are more cost-effective per device. Repairs to failed devices are quoted separately.
What to share when you call
- Device type, serial, and location.
- Last test date.
- City program details if available.
- Property type (restaurant, irrigation, multi-tenant).
- Whether the device is accessible.
- Any prior test failures.
Toronto context
Toronto's Cross-Connection Control Program requires annual backflow testing on commercial water services and certain residential setups (irrigation, boiler systems). We test, document, and submit to the City's online portal — and flag any device that's failing inspection so it can be repaired before the certificate lapses.
When this is not enough
Testing certifies a working device. When the device fails the test and cannot be repaired — body cracks, severe internal corrosion, or obsolete parts — the next step is backflow preventer installation, not another test. We will tell you on the visit which path applies.
What to confirm before approving testing
- The tester should be certified and the gauges calibrated.
- Failed devices should be repaired or replaced before re-testing.
- Reports should be submitted under the property's program.
Useful info on the call: device serial, last test, and program details.
Frequently asked questions
How often do I need to test?
Annually for most backflow devices in Toronto's cross-connection program.
What happens if my device fails?
We diagnose, repair or replace, and retest. The replacement or repair must restore the device to compliance.
Do you submit the paperwork to the city?
Yes. We complete the certified report and submit it under the property's cross-connection program.
What if I miss the annual test deadline?
The city issues a notice. Continued non-compliance can lead to fines or service interruption. Schedule the test before the deadline to avoid that risk.
Related services
Backflow Prevention Testing: real customer reviews
Recent Google reviews from Tornado customers across Toronto and the GTA, in their own words.
Nastaran Razavi
April 2026“Very impressed with Tornado Plumbing & Drains! They installed our grease trap quickly and professionally, without any delays. The team was respectful, organized, and made sure everything was up to code. They also gave us useful tips on maintenance, which was a big plus. Highly recommended!”
Most relevant to Commercial Plumbing in Toronto & the GTA.
Google place photo: Tornado Plumbing & DrainsKaterina Wagner
July 2026“Spectacular service as always. Highly recommend Sergey for any plumbing issues”
kevork ghazarian
August 2022“Let me start by saying , this was by far the best company I have dealt with . Called around 1:30 pm spoke to a plumber named Peter ( he was amazing and very honest ) they showed up around 2 pm and got the job done !! Like I said this was a very good experience, I will definitely use them again . Thank you again to Peter and Tornado plumbing .”
Authoritative sources for this service
Public references — City of Toronto programs, federal guidelines, and standards bodies — used for the rules and figures cited on this page.
- City of Toronto Sewer Use Bylaw — Chapter 681(city)
- City of Toronto — Cross-Connection Control Program(city)
- CSA B64.10 — Selection and installation of backflow preventers(standard)
- City of Toronto — Plumbing permits(city)
- Ontario Building Code — Part 7: Plumbing Services(regulator)
- NASSCO PACP — Pipeline Assessment Certification Program (sewer condition coding)(standard)
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Fast answers before you call
How often do I need to test?
Annually for most backflow devices in Toronto's cross-connection program.
What happens if my device fails?
We diagnose, repair or replace, and retest. The replacement or repair must restore the device to compliance.
Do you submit the paperwork to the city?
Yes. We complete the certified report and submit it under the property's cross-connection program.
What if I miss the annual test deadline?
The city issues a notice. Continued non-compliance can lead to fines or service interruption. Schedule the test before the deadline to avoid that risk.
Book Backflow Prevention Testing today.
Tornado Plumbing & Drains handles Backflow Prevention Testing across Toronto and the GTA. Call 647-784-8448 or book online for a clean diagnosis, written scope, and the 25-year workmanship warranty on every install and repair.