Banjo Nominees have been specialising in backflow testing in Melbourne since 1958. Back Flow Valves are required to be tested every 12 months, and all results must be sent from your accredited plumber to the relevant water authority.

The necessity of backflow testing and backflow prevention services

backflow testing melbourneIt is mandatory to have backflow prevention systems checked and tested every 12 months to prevent risk of water contamination. Businesses have the responsibility to install and test their backflow prevention assemblies, and to ensure that their respective backflow device is working and well-maintained. Neglecting this responsibility may cause contamination and result in a variety of illnesses. Other reasons why businesses need water backflow prevention include:

  • Not having a backflow prevention device is dangerous. The petering out of clean water supply due to cross-connections has the potential to allow contaminants into the drinking water system that, if consumed, can predispose you to develop gastrointestinal illnesses such as diarrhoea, vomiting and abdominal cramps.
  • Liabilities from backflow problems are expensive. Imagine the numerous medical bills that companies need to pay yearly due to contaminated water.
  • A water filter is not enough to prevent water contamination. A water filter acts as a physical barrier against water impurities but isn’t always enough to have consistently safe drinking water. With the installation of a backflow valve, it empowers the anti-water contamination function of water filters by preventing water pollution due to backflow. Backflow prevention testing then ensures your valve is doing its job properly.

Why choose our water backflow prevention services in Melbourne?

  • We have certified backflow technicians. We have highly-skilled and extensively trained plumbers who are approved to conduct backflow testing, maintenance, inspections and repair backflow prevention assemblies. Our technicians are accredited via Master Plumbers and all governing Water Authorities to facilitate cross-connection control and backflow testing Melbourne wide.
  • We analyse and confirm the risk rating of backflow on your property. We know how sensitive backflow situations are. We understand the extensive work needed to ensure that you have safe, fresh and clean water. By successfully identifying the risk rating of backflow on your property through backflow testing, we will be able to determine what type of backflow prevention containment device is needed to address the problem.
  • We provide the most effective way for backflow prevention. With more than 55 years of experience in the industry, we provide the most effective backflow prevention devices for your commercial needs. We install the backflow preventive device in the most strategic locations in your plumbing system and will complete annual backflow prevention testing in accordance with industry standards.
  • We offer ongoing backflow preventative maintenance. We don’t just stop at testing and treating your backflow problems. We provide you with the most appropriate preventive maintenance to ensure that no backflow problems will occur in the future. We schedule re-occurring backflow testing in Melbourne to ensure you are adhering to water authority regulations.

Backflow testing and prevention FAQ’s

What is backflow prevention testing?

Backflow testing is a procedure that is used to examine a plumbing system to make sure that the drinking water is not being contaminated by dirty water flowing the wrong way through the system. Backflow refers to water running backwards through a water system and contaminating the drinking water supply, making it undrinkable.

Why is backflow testing required?

Backflow testing is required for occupational health and safety reasons. Backflow can cause water contamination which can result in serious illness. Backflow prevention devices require testing upon installation, when repaired or relocated, or at the least on an annual schedule. Some high-risk systems require quarterly testing.

How to test a backflow device?

The backflow prevention testing procedure includes a mechanical plumber opening and closing valves to check for any abnormalities in the system and then forming a report. Once the plumber has done the backflow prevention device inspection and maintenance report, the report needs to be submitted to the relevant water authority.

How often should a backflow preventer be tested?

Back Flow Valves are required to be tested every 12 months. and all results must be sent from your accredited plumber to the relevant water authority. Businesses are responsible for the installation and testing of their backflow prevention assemblies, as backflow and contaminated drinking water could leave them open to liabilities.

How much does backflow testing cost?

The backflow prevention testing cost will depend on the scale of the job, but is an affordable test when you consider the cost of medical bills that companies might be required to pay yearly due to a faulty backflow and contaminated water.

Why choose Banjo

Fast reliable service

Fast Reliable Service

Banjo Nominees is available 24/7 to provide you fast and reliable mechanical plumbing services. We can assure an experienced plumber and an immediate solution; Our commercial plumbing contractors in Melbourne operate with fully equipped vans and are always ready anytime you call for our assistance.

We offer customised plumbing solutions

We offer customised plumbing solutions

Problems in your plumbing systems can vary at times. Our Williamstown plumbers will provide the most appropriate and tailored solution for your specific plumbing needs, giving special consideration to your budget requirements throughout.

We serve a wide range of industries

We serve a wide range of industries

We have an extensive network of clients, ranging from industrial, chemical and petroleum sites to hotels, hospitals, education and training institutions. We also work with government departments, real estate companies and facility management organisations.

More than 58 years of experience in the plumbing industry

More than 58 years of experience in the plumbing industry

Established since 1958, you can rest assured with the quality and efficiency of service we can provide. We have been the top choice for commercial, industrial and mechanical plumbing in Melbourne.


CSR has been using Banjo Nominees for all of our plumbing needs, for more than 30 years and I can thoroughly recommend them.
They are always punctual and relied upon to come up with solutions to any problem.
John and his team are always receptive to our needs and always conduct themselves in a professional manner.

Ben Gronow - CSR Lightweight Systems Maintenance Supervisor

Our company has been using Banjo Plumbing since 1975. We always found John Patterson reliable, trustworthy and his tradespeople have always completed their tasks professionally, with pride and to our satisfaction.
I am pleased to recommend Banjo Plumbing for maintenance and new plumbing and roofing projects for a cost effective and satisfactory outcome.

Gabor Hilton - Oxford Cold Storage Company Engineering Manager

Banjo Nominees has been engaged by St Vincent’s Hospital (Melb) Ltd Engineering and Infrastructure Department to carry out the different plumbing works. 
Banjo Nominees have been part of the St Vincent’s team of contractors from May 2019 there services are used across both the Fitzroy and St Georges Campus and also our off site Aged Care sites The standard of works to date has been nothing but professional and we continue to utilize their services on a regular basis.

The Engineering & Infrastructure Team - St Vincent’s Hospital

Banjo has been a contractor for SIMS ALUMINIUM for over twenty five years. The company provides a reliable service with high quality workmanship. It conducts itself with unsurpassed integrity and professionalism.
I would have no hesitation what so ever to recommend Banjo for all plumbing installations or repairs.

Michael Lopatecki - Plant Engineer