Backflow Prevention Auckland | Install, Test & Certify

What Is Backflow Prevention?

Backflow happens when contaminated water flows backwards into the clean water supply. It is caused by a sudden drop in mains pressure — a burst water main, heavy fire service demand, or a nearby pipe failure. Without a backflow prevention device, chemicals, waste water, or other contaminants can be sucked back into the drinking water network.

Auckland Council requires testable backflow prevention devices on any property that poses a risk to the public water supply. This includes commercial premises, properties with irrigation systems, swimming pools with auto-fill, and buildings with chemical dosing or industrial processes.

The device must be installed by a qualified plumber and tested annually by an IQP (Independently Qualified Person). We handle both — installation and ongoing annual testing to keep you compliant.

Our Services

New Installation

We install testable backflow prevention devices to meet Auckland Council requirements. RPZ valves, double check valves, and other approved devices.

Annual Testing

All testable backflow devices must be tested every 12 months by an IQP. We test, certify, and submit the results to Watercare on your behalf.

Repairs & Servicing

Failed the annual test? We repair or replace faulty components — relief valves, check valve seats, seals, and springs — to get you back to compliance.

Upgrades & Replacements

Old device past its lifespan or no longer repairable? We replace with a new approved unit, remove the old one, and handle all the paperwork.

Who Needs a Backflow Device?

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Commercial premises — cafes, restaurants, workshops, salons, offices with kitchen facilities.

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Industrial sites — factories, warehouses, car washes, laundries, food processing.

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Properties with irrigation — automated garden irrigation connected to town supply requires backflow protection.

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Swimming pools with auto-fill — any pool or spa with an automatic top-up valve connected to mains water.

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Fire sprinkler systems — buildings with fire sprinkler connections to the public water main.

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Council notice received — if Watercare or Auckland Council has written to you, you must install and test within the timeframe given.

How Annual Testing Works

Every testable backflow device in Auckland must be tested by an IQP once every 12 months. Here is how the process works:

We schedule a time that works for you. Testing takes 15-30 minutes depending on the device type and access.
We isolate and test the device using calibrated test equipment. We check each check valve and relief valve for correct operation and holding pressure.
Pass? We issue a test certificate and submit the results to Watercare. You are compliant for another 12 months.
Fail? We diagnose the fault on the spot. Most repairs are straightforward — a worn seal, fouled check valve, or sticking relief valve. We carry common parts and can often repair and re-test the same visit.

Frequently Asked Questions

Do I need a backflow prevention device?

If your property is commercial, has an irrigation system connected to town supply, has a swimming pool with auto-fill, or has any process that could contaminate the water supply, then yes. Auckland Council and Watercare require it. If you have received a letter from Watercare, you must comply within the timeframe given.

How often does it need testing?

Every 12 months. This is a legal requirement under the Auckland Council bylaw. If you miss a test, Watercare may issue a notice and can ultimately disconnect your water supply.

What does annual testing cost?

Testing is a fixed-price service. The cost depends on the device type and access. We will quote you upfront before booking.

What happens if my device fails the test?

We diagnose the fault and repair it — usually a worn seal, check valve, or relief valve. Most repairs are done the same visit. We then re-test and certify. If the device is beyond repair, we replace it with a new approved unit.

Can you install a new backflow device?

Yes. We install RPZ valves, double check valves, and other council-approved devices. We size it to your water supply, install it to code, and provide all compliance documentation.