Cost Guide · Updated November 2026
How much does backflow testing cost in Perth?
What Water Corporation requires
Water Corporation says testable boundary devices are legally required to be tested at commissioning, after any maintenance and every 12 months, by an accredited tester. Water Corporation lets an accredited tester do the test but limits installing or maintaining a device to a licensed plumbing contractor, so confirm the tester can also fix a failed valve.
Under the Water Services Regulations 2013, the test report must be lodged within 5 working days of the test, and Water Corporation takes reports through its online lodgement system, which it describes as free. Water Corporation says it sends owners a reminder, and that failure to maintain a device leads to a non-compliance notice, penalties of up to $5,000 and $500 per day, and possible restriction or disconnection of water services.
Sources: Water Corporation; Busselton Water; Water Corporation.
Backflow testing prices — Perth 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Annual backflow test (first device) | $150per device | $199 | $320 |
| Additional device (same visit) | $90per device | $120 | $145 |
| Budget test offers (verify call-out & lodgement included) | $80per device | $130 | $180 |
| Double check valve (DCV) install - 20mm | $650per device | $800 | $950 |
| RPZ valve install - 20mm | $1,250per device | $1,550 | $1,850 |
| RPZ valve install - 25-32mm (commercial / fire service) | $1,250per device | $2,000 | $3,200 |
| Tundish / drain for RPZ (add-on) | $220per install | $350 | $480 |
| Device repair (parts + labour) | $180per repair | $330 | $480 |
| Like-for-like replacement (failed device) | $550per device | $975 | $1,400 |
| Backflow hazard assessment / device sizing (per site) | $150per job | $300 | $600 |
| After-hours test loading | $100add-on | $150 | $250 |
You're in.
A local contractor will be in touch about your job. No spam, no middleman.
When is your backflow test due?
Tell us the month and we'll email you a reminder about a month before, with a link to get quotes. It's free.
In Western Australia testable boundary backflow devices on medium and high hazard properties, and fire services, must be tested at commissioning, after any maintenance and every 12 months by an accredited tester, with a copy of the test report lodged with Water Corporation (or Busselton Water in its area) within 5 working days, under regulation 43 of the Water Services Regulations 2013.
Scoping backflow testing work in Perth? Get a quote from a local commercial contractor - free, no obligation.
Get Perth quotes →Prices include GST. Perth metro, November 2026.
A Malaga cold store has its three testable devices tested before the early shift, and one turns out to be beyond repair. At typical rates that is $199 for the first device, $240 for the other two, an after-hours loading of $150 and $975 for a like-for-like replacement, about $1,564 in all. Water Corporation says only a licensed plumbing contractor may install or maintain a device, so check whether the tester can also do the swap.
What drives the cost of backflow testing in Perth
In Perth, testable devices show up at transport and freight yards in Kewdale and Forrestfield, marine and fabrication workshops at Henderson and Bibra Lake, the hospital campuses at Murdoch and Nedlands, and the Curtin and UWA grounds at Bentley and Crawley.
Hospitality strips such as Northbridge, Leederville and Albany Highway in Victoria Park add plenty of smaller sites with a valve or two. Whatever the site, these are the things that move a Perth bill.
- Valve count per visit. The tester charges $150–$320 for the first device and $90–$145 for every other device done on the same trip. A Kewdale transport yard with devices on the fire service, a workshop and the driver amenities pays the top rate only once.
- Device type, size and install price. RPZ valves take longer to test than double checks. Size really shows when a valve is replaced or added: $650–$950 for a 20mm double check against $1,250–$1,850 for a 20mm RPZ, and $1,250–$3,200 once the line is 25–32mm.
- Night and early-morning visits. A Northbridge kitchen that preps from first light, or a Kwinana plant running continuous shifts, may need the test outside normal hours, which adds $100–$250 to the visit.
- Offers that look too good. Advertised rates of $80–$180 per device are worth checking. Ask whether the call-out to Joondalup or Armadale and the report lodgement described above are part of the figure.
- Fails on test day. Repair with parts and labour is $180–$480; a valve that is past saving is replaced like for like at $550–$1,400.
- Reaching the valve and planning new work. A valve at the back of a fenced yard, down a pit or behind a roller door takes longer to get to. A new tenancy starts with a hazard assessment and device sizing at $150–$600.
Backflow testing costs in Perth by type of site
These cards price one annual visit for common Perth site types. Each one states the device count it assumes; change the count and the arithmetic changes with it. Every range assumes all the devices are tested in one visit.
Boutiques and salons in Claremont
$150–$320 per visit
Assumes one testable device on the shop's supply, tested on a weekday morning with the water off for a short time.
Restaurants and small bars in Northbridge and Leederville
$340–$715 per visit
Assumes two testable devices on the main supply and the kitchen, tested before the morning deliveries and prep so the after-hours loading applies.
Marine and fabrication workshops at Henderson
$330–$610 per visit
Assumes three testable devices: the fire service, a wash-down line and a process water line, tested during the day shift.
Freight depots near Perth Airport and Forrestfield
$420–$755 per visit
Assumes four testable devices: two fire services, a truck maintenance bay and the staff amenities.
Light manufacturing in Balcatta and Wangara
$510–$900 per visit
Assumes five testable devices on process water, a chemical dosing line, the boiler, irrigation and the fire service.
University and research buildings in Bentley
$700–$1,295 per visit
Assumes six testable devices across laboratories, a cooling plant and fire services, tested outside teaching hours.
Every count above is an example premise for that card. The range is this page's first-device row for one valve, plus the additional-device row for each one after it, plus the after-hours row on cards that test out of hours.
What backflow repairs, replacements and new installs cost in Perth
A failed test leaves two paths: fix the valve or replace it. A repair with parts and labour is $180–$480. A failed device that cannot be brought back is replaced like for like at $550–$1,400.
New valves are priced on type and size. A 20mm double check valve is $650–$950. A 20mm RPZ is $1,250–$1,850, and since an RPZ needs somewhere to discharge, the tundish or drain adds $220–$480, making $1,470–$2,330 all up. On a commercial or fire service supply, a 25–32mm RPZ is $1,250–$3,200, and with its tundish the job comes to $1,470–$3,680.
A hazard assessment and device sizing at $150–$600 is the first step for new work, such as a food business moving into a unit in Myaree or a lab going into the Murdoch health precinct, so the device suits the risk before it is bought.
If a site has changed since its valve went in, such as a new process line or a different tenant, the old device may no longer suit the hazard. Moving from a double check valve to an RPZ is priced as a new install plus tundish, not as a like-for-like swap.
Ways to trim backflow testing costs in Perth
Most savings come from organising the visit well rather than haggling over the rate, and they repeat every year.
- One visit for the whole site. Line up the fire, process and amenities devices on the same day so every one after the first is charged at $90–$145 instead of $150–$320.
- Book in working hours if you can. A short shut-off in the middle of a weekday avoids the $100–$250 loading. Let staff know the water will be off briefly.
- Confirm what a cheap rate includes. At $80–$180 per device, a budget offer should still name the call-out and lodgement. If either is extra, the saving may disappear.
- Keep pits and cages clear. Dirt, weeds and stored gear around valve pits slow the tester down. Clear them and label each device before the visit.
- Have the history ready. Earlier test reports tell the tester each device's make, size and location, so the right spares come in the van.
- Swap out a repeat offender. If the same valve needs a $180–$480 repair at most visits, a planned like-for-like replacement at $550–$1,400 can work out cheaper over a few years.
Backflow testing cost in Perth: commercial properties, reticulation and fire services
Backflow testing in Perth costs $150–$320 per device for the first device on a commercial property, with $199 a typical price, and $90–$145 per device for each additional device tested on the same visit. A property with one device sits in the first-device range; sites with several devices pay the extra-device rate for each one after the first.
Commercial properties across Osborne Park, Welshpool, Malaga and Canning Vale often have devices on fire services, irrigation and process lines, and many sites run garden reticulation, which can add another device to the schedule. Perth's hot, dry summers are hard on devices in full sun. When a test fails, repairs cost $180–$480 per repair, and a like-for-like replacement is $550–$1,400 per device. New installs on larger supplies, such as a 25–32mm RPZ valve for commercial or fire services, run $1,250–$3,200 per device, with a tundish or drain at $220–$480 per install.
Cafés and shops in Subiaco, Fremantle and Mount Lawley often want tests before opening, which adds after-hours loading of $100–$250. A good Perth quote should include a device schedule covering fire, irrigation and domestic services, separate first and additional device prices, report lodgement, and fixed repair prices if a device fails.
What a Compliant Backflow Testing Quote Includes — Cost in Perth
Many Perth properties run garden reticulation alongside fire and process services, so a quote here should count every device, separate the fire, irrigation and domestic lines, and say who repairs a valve that fails.
- Reticulation valves counted alongside the fire service and process lines, so no device on the property is left off the list.
- Whether the person testing can also carry out repairs, or a second contractor has to come back for a failed valve.
- Fixed repair prices, with $180–$480 per repair and like-for-like at $550–$1,400 per device, agreed before the visit.
- Sun-exposed devices noted, given hot, dry Perth summers, with their condition recorded on the report.
- For a Subiaco, Fremantle or Mount Lawley café, a before-opening slot with the $100–$250 loading shown once.
- Who lodges the test report through the Water Corporation online system, and whether that sits inside the quote.
- GST included or extra, and the tester's licence number and insurance.
Frequently Asked Questions — Backflow Testing Cost in Perth
How much does a backflow test cost in Perth?
In Perth the first device tested on a visit costs $150–$320, and $199 is a typical price. Each further device checked while the tester is on site adds $90–$145 per device. Cut-price offers of $80–$180 per device are around, so confirm they cover the call-out and the report to Water Corporation. A device that fails costs $180–$480 per repair on top.
How often does a backflow device have to be tested?
Water Corporation says testing of a testable boundary device is legally required at three points: when it is commissioned, after any maintenance, and every 12 months, each time by an accredited tester. For a testable boundary device, Water Corporation's rule means a test every year plus another after any repair or service. Each yearly visit costs $150–$320 for the first device and $90–$145 for every extra device seen that day.
What happens if I skip the annual test?
Water Corporation sends the owner a reminder first. If the device is still not maintained, Water Corporation issues a non-compliance notice; penalties can then reach $5,000 and $500 per day, and water services may be restricted or disconnected. Under the Water Services Regulations 2013 the test report is lodged no later than 5 working days after the test.
What is the difference between an RPZ and a double check valve?
A double check valve works as two one-way gates in one body; a 20mm unit costs $650–$950 per device to put in. An RPZ keeps those gates and adds a relief port that can vent water, so it sits over a tundish or drain, an add-on at $220–$480 per install. Installed, RPZ units cost $1,250–$1,850 per device at 20mm and $1,250–$3,200 at 25–32mm on commercial or fire lines. Both are testable, and a hazard assessment at $150–$600 per job picks one.
Does backflow testing cost more in Perth?
Not on the test itself: the per-device rates in this guide carry no Perth loading, so the job sets the bill. An outer-suburb site such as Ellenbrook or Armadale can add travel time. Testing before or after trading hours adds a loading of $100–$250. Grouping every device into one visit keeps all but the first at $90–$145 each. A failed device adds $180–$480 per repair, or $550–$1,400 per device to replace. Water Corporation describes online lodgement of test reports as free.
How much is backflow testing for a Perth site with a long list of devices?
Perth pricing starts at $150–$320 for the first device and drops to $90–$145 for every other device the tester covers on that visit. A Canning Vale food manufacturer with six devices, on two fire services, a cool room, the wash-down bays, garden reticulation and the staff kitchen, would pay $600–$1,045 for the visit, about $799 at typical rates. Reticulation valves are easy to overlook, so walk the grounds as well as the plant room before you book.
If my Perth site's backflow valve fails, how much will I pay?
When the valve body is sound, fixing it for $180–$480 in parts and labour is normally the first option. If the tester can't get it to pass again, a like-for-like replacement at $550–$1,400 takes its place. The two rows don't overlap: even the top of the repair range, $480, sits below the bottom of the replacement range, $550, so a repair is the lower-cost path whenever the valve can take one. Check that the tester can do the repair or swap on the day, so a Welshpool workshop isn't left booking a second trade for it.
What does a Perth fit-out pay for a new backflow device?
The first cost on a fit-out is the hazard assessment and sizing, at $150–$600, which settles what the connection needs. For an Osborne Park office or clinic where a double check valve will do, a 20mm DCV is $650–$950. Where an RPZ is called for, the 20mm valve is $1,250–$1,850, and its tundish or drain at $220–$480 brings that to $1,470–$2,330 in all. On a commercial or fire-service supply, a 25–32mm RPZ runs $1,250–$3,200, or $1,470–$3,680 with its tundish.
Should a Perth business be wary of very low backflow test prices?
Not wary, just thorough. A budget offer of $80–$180 per device can be good value if the call-out and report lodgement sit inside it. If the business is out in Joondalup, Armadale or the Swan Valley, ask about travel too. For three devices, the typical budget total is $390 against a typical full quote of $439, so it only takes one extra fee to wipe out the difference. Ask for the all-in price in writing.