- The leak allowance credits back up to 50% of the estimated water lost to a hidden leak. It does not cover detection or repair costs.
- Your leak has to be genuinely hidden (underground, under a slab, in a wall) and your bill has to clear $250 or 150kL.
- Repairs must be done within 60 days of finding the leak, by a licensed plumber (or WGI for irrigation), and you apply within 6 months.
- Most rejected claims fail because of one thing: a missing or non-compliant invoice.
- Retic repairs also need a manual isolation valve and master solenoid fitted, or that part of the claim is refused.
- Landlords and tenants: structural plumbing is the landlord’s responsibility under WA’s Residential Tenancies Act.
The Water Corp Leak Allowance: How It Actually Works, and Why Claims Get Knocked Back
If your latest Water Corporation bill made no sense, you’re not alone. A hidden leak can waste hundreds of thousands of litres before anyone notices, and the bill is usually the first sign anything’s wrong.
The good news: Water Corporation has a leak allowance that can credit back up to half the water you lost.
The bad news: a lot of claims get rejected, almost always for the same avoidable reason. This guide covers what the allowance actually pays for, who qualifies, and the one paperwork mistake that costs homeowners thousands.
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What the leak allowance actually pays for
The leak allowance is a credit of up to 50% of the estimated water lost to a hidden leak, applied to your next bill.
It does not cover the cost of finding the leak. It does not cover the cost of repairing it. It only offsets the water usage charge itself.
If you’re expecting the allowance to cover your plumber’s invoice, it won’t.
Budget for detection and repair as a separate cost, and treat the allowance as a partial refund on the water you lost.
Do you qualify? The eligibility rules
Water Corporation assesses every application individually, but the core criteria are fixed:
Miss any one of these and the claim is refused, regardless of how genuine the leak was.
What automatically disqualifies a claim
- Visible leaks in taps, cisterns, dishwashers, washing machines, or pools, spas, ponds and water features
- Repairs that weren’t done or verified by a licensed plumber or WGI
- Vacant land, properties under construction, or uncapped/open-end meters with no standpipe
- Retic repairs where a manual isolation valve and master solenoid weren’t fitted (see below)
- Properties under a Water Corporation Special Agreement (major consumer framework, e.g. mining sites)
The invoice trap: why most rejected claims fail
Talk to anyone who’s had a leak allowance claim knocked back and there’s a good chance it comes down to one thing: the invoice.
Water Corporation needs a proper, itemised invoice from your licensed plumber or WGI, specifying the exact nature and location of the hidden leak.
A verbal confirmation doesn’t work. A handwritten receipt doesn’t work.
A cash job with no paperwork trail doesn’t work, even if the leak was completely genuine and the repair was done properly.
Important: if your plumber can’t produce compliant documentation, you can do everything else right and still get rejected. This is the single most preventable reason a legitimate claim fails, and it’s entirely down to who you hire, not how bad the leak was.
The retic-specific catch nobody warns you about
If the leak was in your irrigation system, there’s an extra requirement that catches a lot of people out.
Warning: the repair now has to include fitting a manual isolation valve and a master solenoid to the retic system, on top of the actual leak repair. If that’s not installed, Water Corporation won’t approve the retic component of the claim, no matter how clear-cut the leak itself was. Ask your irrigator whether this is already priced into your quote before the work starts.
How to apply
Once the repair is done, you’ll need to gather your documents, then submit and track your application.
Landlords, property managers and tenants: who actually pays
Under the Residential Tenancies Act 1987 (WA), sections 42 and 49, maintaining structural plumbing is the landlord’s responsibility, not the tenant’s. If a hidden leak is behind a high bill at a rental, the repair and the resulting bill sit with the owner, not the person living there.
The same invoice rule applies here too: no compliant documentation from a licensed plumber or WGI, no allowance, and the full bill stays with the owner.
Since Water Corporation assesses every application case by case, landlords are better off treating a proper invoice as non-negotiable from the first call, rather than finding out after the bill’s already been passed on to a tenant.
Tenants facing a bill dispute over a structural leak have a legal basis to push back and refer the property manager to the relevant sections of the Act, rather than simply paying an inflated bill.
Why this matters more than the repair cost
For most Perth homeowners dealing with a leak, the allowance is worth more attention than the repair itself. A denied claim over a missing invoice is money that’s gone for good, and it’s entirely preventable.
The fix is simple: use a licensed plumber who documents the job properly from the start, and don’t let cost be the only factor in who you hire.
Related → How to detect an underground water pipe burst | Water leak detection Perth
Common questions
How do I apply for the Water Corp leak allowance?
Get the leak repaired by a licensed plumber (or WGI for irrigation), then apply through Water Corporation with your bill details, meter number, meter reading and the repair invoice. Approval typically takes around 20 business days.
What makes a hidden leak ineligible?
Anything visible: dripping taps, running cisterns, leaking appliances, or exposed sprinkler heads. It also becomes ineligible if the repair wasn’t done by a licensed plumber or WGI, or if it wasn’t completed within 60 days of detection.
How long do I have to repair the leak to qualify?
60 days from when you found the leak or were notified of high water use. You then have 6 months from the repair date to lodge the application.
What does the invoice need to include?
An itemised, professional invoice from a licensed plumber or WGI that specifies the exact nature and location of the hidden leak. This is the single most common reason genuine claims are rejected, so confirm your plumber provides one before the job starts.
Can I claim if the leak was in my irrigation system?
Yes, if repaired by a WGI, but the repair must also include fitting a manual isolation valve and master solenoid. Without those, the retic portion of the claim won’t be approved.
Aus Star Plumbing & Gas, Licence PL7378, servicing Perth’s south corridor and Peel region including Rockingham, Baldivis, Kwinana, Mandurah, Cockburn and surrounds.