Backflow prevention is one of the quieter compliance obligations attached to commercial property. There’s no alarm when it lapses, nothing stops working, and most owners only find out they’ve missed it when a water authority notice arrives or a building is being sold.
Work through the six questions below and you’ll know where your property stands.
First, what the device is actually for
Backflow is water flowing the wrong way, from your property back into the mains supply. It happens when pressure in the main drops, during a burst or heavy draw on a hydrant, and water gets pulled backwards out of connected systems.
If your property only has ordinary domestic fixtures, the risk to the public supply is low. If it has a cooling tower, an irrigation system, chemical dosing, a dental chair, a laboratory, a fire service or a wash bay, then what could get pulled back is a genuine contamination risk to everyone downstream of you.
That’s why the obligation exists and why it sits with you rather than with the authority.
Question 1: Do you have a backflow prevention device installed?
If yes, you almost certainly have a testing obligation attached to it. Devices are installed because a hazard was identified, and the obligation follows the hazard.
If you don’t know, that’s the most common answer and worth resolving. Devices are usually located at or near the water meter or at the connection to the specific system they protect. If nobody at your business knows whether there is one, treat that as the answer to question 6 as well.
Question 2: What’s connected to your water supply?
Run through this list and mark anything present at your property.
Fire services and hydrants. Cooling towers or evaporative systems. Irrigation. Vehicle or plant wash bays. Chemical storage or dosing. Commercial kitchens. Dental or medical equipment. Laboratory equipment. Trade waste pre-treatment. Rainwater or recycled water connected to the same system as mains.
Anything ticked means a hazard rating has probably been assigned to your property, and with it a device and a testing requirement.
Question 3: Has it been tested in the last twelve months?
Testable backflow prevention devices generally require annual testing by a licensed plumber endorsed for backflow, with results submitted to your water authority.
Twelve months passes quickly and there’s rarely a prompt. If you can’t produce a test report dated within the last year, assume it’s overdue.
Question 4: Can you produce the certificate?
This is the question that matters more than it seems. Two things fail here regularly.
The test was done but the report was never lodged with the authority, so as far as the authority is concerned it didn’t happen. Or the test was done, lodged correctly, and the paperwork lives in the inbox of a facilities manager who left two years ago.
If you can’t put your hand on the current certificate within a few minutes, your record-keeping needs attention regardless of whether the test itself happened.
Question 5: Has anything about the property changed?
A new tenant with a different use. A new coffee machine, dishwasher or dental chair. An irrigation system added to the garden. A wash bay installed out the back. A cooling tower replaced.
Any of these can change your hazard rating, which can change the class of device required. A device that was correct for the previous use is not automatically correct for the current one, and this is the single most common reason a property is non-compliant despite having a device and testing it faithfully.
Question 6: Does anyone actually own this task?
Backflow testing falls between roles constantly. The landlord assumes the tenant handles it because they occupy the building. The tenant assumes the landlord handles it because it’s building infrastructure. The managing agent assumes it’s on the maintenance contractor’s schedule. The maintenance contractor was never asked.
Check your lease, then confirm in writing who is responsible. An annual obligation with no named owner is an annual obligation that will be missed.
If you’ve answered badly
Nothing here is difficult to put right. Arrange an inspection to confirm what’s installed and whether it still suits the property’s current use, have it tested by a licensed backflow plumber, get the results lodged, and set a recurring reminder for eleven months from now rather than twelve.
If a device turns out to be wrong for the current hazard rating, replacement is a straightforward job in most cases. The cost of doing it now is invariably lower than the cost of doing it under a compliance notice or during a sale.
Where we see this most
Properties with clinical, laboratory or specialised equipment carry the strictest requirements, which puts the research and medical facilities around Clayton and the healthcare sites in Berwick and Frankston at the top of the list.
Consulting suites are the most commonly overlooked, because the equipment is small and the hazard isn’t obvious. We find lapsed obligations regularly in the medical and dental suites through Balwyn, Hampton, Brighton and Mentone.
Industrial sites with wash bays, dosing or process water are the other cluster, particularly around Dandenong, Bayswater, Braeside and Carrum Downs, where a change in what the site produces often changes the hazard rating without anyone reassessing the device.
Frequently asked questions
Who is responsible, the landlord or the tenant?
It depends on the lease and on whether the device protects base building infrastructure or a tenant’s specific equipment. Check the lease and confirm it in writing, because assuming is how it gets missed.
Can any plumber do the test?
No. Testing must be done by a licensed plumber with the backflow endorsement, and the results have to be submitted to your water authority.
What happens if we’ve missed a year?
Arrange the test. Authorities are generally more constructive with a property owner who comes forward than one identified through their own compliance process.
How do I find out what’s installed on my property?
We can inspect, identify what’s there, assess whether it still suits your current use and test it in the same visit. Get in touch and we’ll arrange it.
