What Is Backflow and Why Is It Dangerous?
Backflow occurs when water flows in the reverse direction due to a sudden drop in pressure in the main water supply. This can happen during:
- Water main bursts in your area
- Fire hydrant use nearby
- Heavy water demand in the street
- Plumbing faults within a property
When this happens, contaminants from irrigation systems, toilets, chemicals, or industrial equipment can be siphoned back into the drinking water line.
This poses serious health risks and is why backflow prevention devices must be tested annually.
Thermostatic Mixing Valves
Thermostatic mixing valves (TMVs) are designed to keep water at a safe temperature. If they drift out of calibration or fail, they can allow dangerously hot water through.
TMVs and Backflow prevention devices are both essential for maintaining a safe, compliant water system. TMVs control temperature at outlets, but rely on a clean stable water supply.
Backflow devices protect that supply from contamination. If a backflow device fails, contaminated water could enter the system feeding the TMV which can lead to unsafe water temperatures.
Who Needs TMV & Backflow Testing?
Backflow testing is required for properties that have:
- Irrigation or sprinkler systems
- Fire hose reels and hydrants
- Commercial kitchens and food premises
- Medical and dental clinics
- Factories and industrial equipment
- Chemical storage or processing areas
- Multi-storey buildings and strata complexes
Where a Thermostatic mixing valve is installed, it is integral to ensure fail-safe operation to prevent:
- Scalding injuries
- Temperature fluctuations
- Thermal shock
- Unsafe hot water delivery
If your property has a registered backflow prevention device or TMV, annual testing is mandatory by a licensed plumber.
Our Certified Backflow Testing Process
We provide professional backflow testing in accordance with Australian Standards and local water authority requirements.
Our service includes:
- Inspecting the backflow prevention device
- Pressure testing to ensure correct operation
- Identifying worn valves or faults
- Servicing or repairing devices if required
- Completing official compliance reports
- Lodging test results with the relevant water authority
- You receive all documentation required to remain compliant
TMV Testing
Our TMV testing service includes:
- Temperature testing at outlets
- Isolation and fail-safe testing
- Cleaning and servicing of internal components
- Recalibration where required
- Completing official compliance reports
Book Your TMV & Backflow Testing Today
If your annual backflow test is due or you’ve received a reminder notice from your water authority, don’t delay.
Contact The Plumbing and Roofing Company today to arrange certified TMV and backflow testing anywhere across Melbourne.
Our team will ensure your system is safe, compliant, and properly documented.
FAQs
Your Plumbing & Roofing Questions Answered Quickly and Clearly
How often does TMV and backflow testing need to be done?
Backflow devices and TMVs must be tested every 12 months by a licensed plumber.
What happens if my device fails the test?
We can repair or replace components on the spot and retest the device.
Do residential properties need backflow testing?
Some do, particularly if they have irrigation systems or fire services connected.
Who receives a copy of the compliance report?
We lodge the report with the relevant water authority and provide you a copy.
How long does the testing take?
Most tests take 20 to 30 minutes per device/valve.
Is backflow testing a legal requirement?
Yes, for any property with a registered backflow prevention device.
