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Backflow Prevention & Testing

Testable backflow prevention devices and thermostatic mixing valves (TMVs) have to be installed, maintained and, for backflow devices, tested and certified every year and lodged with your water authority. We install, repair and carry out the annual test and certification, a recurring compliance job many households and small businesses forget about until a notice arrives.

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What's included

  • Backflow device installation
  • Thermostatic mixing valve (TMV) install & maintenance
  • Annual backflow testing & certification
  • Water-authority lodgement
  • Device repair & replacement
  • Commercial & strata sites
  • Compliance reminders
Thermostatic mixing valve on copper, block wall, gauges and isolation valves.

Indicative pricing

$130–$220

A market-typical guide, not a quote. Your exact price for the job is confirmed in writing before any work starts.

See the full price guide

Licensed & insured

Every job is carried out by Josh, a licensed plumber and gas fitter (Donza Plumbing Pty Ltd, ABN 51 697 209 153), and certified to AS/NZS 3500 plumbing & AS/NZS 5601 gas.

Gas FittingFully insuredUpfront quotes

Servicing

On the tools

Testable backflow prevention device installed on the water service at the property boundary.
Testable backflow prevention device installed on the water service at the property boundary.
Backflow assembly going in, isolation valves and strainer either side of the device.
Backflow assembly going in, isolation valves and strainer either side of the device.
Boundary backflow assembly commissioned and left clear for annual testing.
Boundary backflow assembly commissioned and left clear for annual testing.
Thermostatic mixing valve on copper, block wall, gauges and isolation valves
Thermostatic mixing valve on copper, block wall, gauges and isolation valves

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