Site protection at the meter, zone protection inside the boundary, and annual compliance testing lodged with Sydney Water and your local water authority. Accredited backflow plumber, full inspection and testing records kept on file, renewal reminders sent before your annual due date.
Backflow work falls into four predictable triggers. Some are new builds, some are annual renewals, some are a failed test on the clock. Quick read on which one you’re dealing with.
Council, your water authority or your engineer has specified a backflow device on a new build, fit-out or change of use. Hazard rating dictates the device type.
Your testable backflow device is approaching its annual compliance window. It needs to be tested by an accredited plumber and the results lodged with the water authority.
The device didn’t pass its annual test. Internal seal failure, check valve worn, relief valve sticking. It needs repair or replacement before it can be recertified.
Your site has been reassessed (new process, new chemical, new tenant) and the existing protection no longer suits the hazard rating. Upgrade required.
Industrial sites, commercial properties, body corporates and any premises with a testable backflow device. If you’ve received a notice from Sydney Water about an upcoming annual test, your engineer has flagged backflow on a new build, or your existing device has failed, this is the page. We’re an accredited backflow plumber and we lodge testing results directly with the water authority on your behalf.
Backflow work splits into four scopes. Each is sized to the hazard rating and the location on your site. Here’s what each one actually involves.
Boundary backflow assembly between the water meter and the property, sized to the service and hazard rating. RPZ for high hazard, DCV for medium, dual-check arrangements for low. This is the assembly Sydney Water sees on the site plan.
Backflow on specific zones inside the boundary: chemical dosing, cooling tower makeup, recycled water connection, irrigation tap-off, fire service header. Each zone gets a device matched to its own hazard rating, not the site’s average.
Testable backflow devices must be tested annually by an accredited plumber, results lodged with the water authority. We test, generate the certificate, lodge it directly with Sydney Water, and add the device to our reminder system for next year.
A failed annual test puts the device in a fix-or-replace decision. Cartridge kits and seal sets for newer devices, full replacement for older or heavily worn assemblies. Sourced from the major manufacturers and re-certified on the same visit where stock allows.
Across Greater Sydney, Sydney Water sets the backflow framework and accepts the lodged test results. Hazard ratings (low, medium, high) drive what device is required, where it sits, and how often it needs to be tested.
A small café and a chemical-handling factory sit on opposite ends of the same rulebook. The café might need a single dual-check at the meter; the factory needs site protection plus zone protection on every chemical, cooling tower and recycled water line.
The pattern we see most: a site grows or changes process and the original device is now undersized for the hazard rating. We handle both ends, café through to heavy industrial, and have long-running accounts with Yates Manufacturing (20+ years), Knauf Gypsum (15 years), Veolia (10 years) and the Brickworks family of sites for ongoing annual compliance.
Every install follows the same five steps. Annual testing skips ahead to step four. Either way the certificate ends up with Sydney Water, and your next due date ends up on our calendar.
On-site walk through. Identify hazard rating per AS/NZS 3500.1, agree the device type and zone strategy. Look at process water, recycled water, chemical lines and any high-risk zones.
SWMS for the install, site induction where the client requires it, certificate of currency on insurances. Industrial sites get the documentation before tools come out of the ute.
Install or replace the device (RPZ, DCV, SCDCV or break tank), sized correctly, with isolation valves and a tundish drain where the device requires it. Brass body assemblies preferred.
Commission the device, run the accredited test, generate the certificate, lodge it with Sydney Water and your local water authority. You get a copy for your compliance file.
The device goes onto our annual reminder system. You get a heads-up before the next due date so the test happens inside the compliance window. 12-month workmanship warranty on the install.
We work across the major backflow manufacturers used in Sydney commercial and industrial work. Common cartridge and seal kits kept in the van so failed annual tests can often be repaired and recertified the same visit.
Direct answers from an accredited backflow plumber. If your question isn’t here, send it through and we’ll add it.
Ring the workshop, send the device details, or upload the Sydney Water reminder letter through the contact form. We’ll confirm the device on site, run the test, lodge the certificate and put you on the reminder list for next year.
