Why Your Toilet Keeps Running
A running toilet has one of three causes, and each leaves a clue. The inlet valve may fail to close, the flush valve seal may be leaking water into the pan, or the fill level may sit past the overflow. Here is what to check when a toilet keeps running, before you call a licensed plumber.
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Bellara grew hardest through the 1980s, and many cisterns here have been on the wall since then. Homes near the Bribie Island Fire Station and the island's police station carry the same ageing suites as everywhere else. The plumbers behind Bellara plumbing wrote this guide for those bathrooms.
The Three Causes of a Running Toilet
Three faults explain a running toilet: an inlet valve that keeps filling, a flush valve seal leaking water into the pan, and a fill level that sends water down the overflow.
Each fault leaves its own sign:
A constant hiss or trickle after the refill
is the inlet valve failing to close.
A cistern that refills itself every few minutes, with nothing flushed
, is the flush valve seal leaking.
Water running out through the overflow, or an overflow pipe dripping outdoors
, means the cistern is filling past its level.
The inlet valve's job is refilling the cistern after a flush, and it stops once the float reaches its level. The flush valve sits at the bottom of the cistern and keeps the water in until you press the button. The overflow is the escape route that carries excess water away rather than onto the floor.
Check for a Silent Leak With Food Colouring
Run the test like this: add several drops of food colouring to the cistern, wait without flushing, and any colour appearing in the bowl means water is escaping.
A few details make the test reliable:
- Colour in the bowl with nothing flushed means water is passing the seal at the bottom of the cistern.
- Flush when the test is done, because the dye won't stain a porcelain bowl.
- A clear bowl means the seal is holding, so the fault sits with the valve or the fill level.
No dye at home? Press some dry toilet paper high on the rear wall of the bowl, above the waterline. The paper should stay dry unless water is trickling down the back wall of the pan, and damp paper means a leak.
Unitywater, the utility that supplies Bellara, recommends both checks.
Water Runs but the Cistern Stays Low
A cistern that won't fill usually comes down to an inlet valve that's worn or gummed up, a float riding low, or a stop tap half closed. Check the stop tap first, since ruling it out costs nothing.
The trickier case is a supply that runs while the cistern never gains. The seal at the bottom may be letting water out as quickly as it arrives, so the supply keeps working and the cistern holds nothing. Cisterns from the island's 1980s building wave are old enough for exactly this failure.
The QBCC List of Unregulated Cistern Work
Under QBCC rules, three cistern parts fall outside regulated work: the washer inside a drop valve, the washer inside a float valve, and a suction cup rubber. Anyone who has the knowledge and skill for the job may repair or replace them, and no licence, approval or report is needed. The finished work is still held to the standards the codes set.
Any other cistern repair is regulated minor work, so a QBCC licensee does it, without a permit and without a Form 4. Inlet valves, flush valve assemblies, buttons and cistern swaps all sit on that side of the line.
Queensland tenancy law requires the owner or manager to keep a rental in good repair; the tenant's part is reporting faults straight away.
What a Running Cistern Does to Your Water Bill
No. The concealed leak adjustment Unitywater offers won't cover water a leaking cistern wastes, and the same goes for taps, hot water systems and other water appliances. Leaks on a property are the owner's responsibility, and so are the losses from them.
A cistern refilling around the clock draws metered water all day, and the bill follows the meter. That is the quiet cost of a fault that never floods anything.
When to Call a Plumber
Call once the dye test confirms a leak, or once the toilet keeps running after the three unregulated parts have been checked. We handle toilet repairs of every kind, from inlet valves to full cistern replacements. You get a fixed quote before any work starts, with flat-rate pricing and no hidden fees.
One booked visit can also sort a weeping mixer or a slow tap on the same run.
Toilet Questions Answered
Call (07) 3523 7172Why does my toilet keep running after I flush?
One of three parts has usually failed. The inlet valve may not be closing, the flush valve seal may be leaking water into the pan, or the level may sit past the overflow. A constant hiss suggests the inlet valve, and a cistern that refills itself suggests the seal.
How do I test my cistern for a silent leak?
Put some food colouring in the cistern, leave it unflushed and wait, then check the bowl. Colour showing in the bowl means water is escaping past the seal. Flush afterwards, since the colouring leaves no mark on porcelain.
Can I fix a running toilet myself in Bellara?
Yes, but only for the washer inside a drop valve, the washer inside a float valve, and a suction cup rubber. The QBCC treats these as unregulated work that still has to reach the standards. Every other cistern repair needs a licensed plumber.
Who fixes a running toilet in a Bellara rental?
Queensland tenancy law makes the owner or manager responsible for repairs, and the tenant reports the fault straight away. A running cistern is not on the emergency list, so it counts as routine and gets fixed in a reasonable time. A blocked or non-working toilet is the emergency version.
Talk to Us About the Running ToiletWe'll call you back.
Book on (07) 3523 7172 for plumbing anywhere in Bellara. We're available 24/7, there's no extra charge for nights, weekends or public holidays, and every job comes with $0 call-out fees.
To claim your $0 call-out fee, call (07) 3523 7172 today.